1W071 CDC Book 3

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  • 1/90 Questions

    Which atmospheric occurrence is not a type of lifting mechanism for convection?

    • Convection.
    • Frontal lifting.
    • Decompression.
    • Orographic lifting.
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About This Quiz

The 1W071 CDC Book 3 quiz assesses knowledge in meteorology, focusing on operational weather forecasting. It covers model output discussions, severe weather analysis, and forecast verification processes, equipping learners with skills to analyze and predict severe weather conditions effectively.

Meteorology Quizzes & Trivia

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  • 2. 

    Which type of airmass is tropical in origin and generally warm and moist?

    • Type I Great Plains.

    • Type II Gulf Coast.

    • Type III Pacific Coast.

    • Type IV Inverted V.

    Correct Answer
    A. Type II Gulf Coast.
    Explanation
    The Gulf Coast is known for its warm and moist climate, making it a suitable region for a tropical airmass. The other options, such as the Great Plains, Pacific Coast, and Inverted V, do not typically have the same warm and moist characteristics as the Gulf Coast. Therefore, Type II Gulf Coast is the correct answer.

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  • 3. 

    Which concept should be considered when trying to determine hail size?

    • Strength of the updraft.

    • Rotation at the base of the storm.

    • Strength of the convergence aloft.

    • Rotation in the mid-levels of the storm.

    Correct Answer
    A. Strength of the updraft.
    Explanation
    When trying to determine hail size, the concept that should be considered is the strength of the updraft. The updraft is the upward movement of air within a storm, and it plays a crucial role in the formation of hail. A strong updraft can carry water droplets higher into the storm, allowing them to freeze and grow larger before falling to the ground as hailstones. Therefore, the strength of the updraft is directly related to the size of the hailstones that can be produced.

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  • 4. 

    What size hail do classic supercell thunderstorms typically produce?

    • Marble.

    • Softball.

    • Golf ball.

    • Baseball.

    Correct Answer
    A. Golf ball.
    Explanation
    Classic supercell thunderstorms typically produce hail the size of a golf ball.

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  • 5. 

    What does the line echo wave pattern (LEWP) signature mean to a forecaster?

    • A favorable environment exists for severe weather development.

    • High pressure is forming and the threat of severe weather has ended.

    • Continued thunderstorm development is certain but severe weather is unlikely.

    • The current state of the atmosphere is much too stable for severe weather development.

    Correct Answer
    A. A favorable environment exists for severe weather development.
    Explanation
    The line echo wave pattern (LEWP) signature indicates a favorable environment for severe weather development. This means that conditions are conducive for the formation of severe weather events such as thunderstorms, tornadoes, or heavy rainfall. The LEWP signature is a valuable tool for forecasters as it helps them identify areas where severe weather is likely to occur, allowing them to issue appropriate warnings and take necessary precautions.

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  • 6. 

    What areas do Storm Prediction Center advisory charts outline?

    • Areas of expected crosswinds.

    • Areas of expected severe weather.

    • Areas of frequent crosswind occurrence.

    • Areas of frequent severe weather occurrence.

    Correct Answer
    A. Areas of expected severe weather.
    Explanation
    Storm Prediction Center advisory charts outline areas of expected severe weather. These charts provide information on the likelihood and intensity of severe weather events such as tornadoes, thunderstorms, and hail. By outlining these areas, the charts help to alert and inform the public and emergency management agencies about the potential risks and impacts of severe weather.

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  • 7. 

    What action is the goal of severe weather analysis?

    • Identify the preconditions that allow storms to become severe.

    • Identify the different types of severe thunderstorms.

    • Determine the rear-flank downdraft wind direction.

    • Determine the mid-level wind speed and direction.

    Correct Answer
    A. Identify the preconditions that allow storms to become severe.
    Explanation
    The goal of severe weather analysis is to identify the preconditions that allow storms to become severe. This involves examining various factors such as atmospheric instability, moisture content, and wind patterns to determine the likelihood of severe weather development. By understanding these preconditions, meteorologists can better forecast and warn the public about potentially dangerous weather events.

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  • 8. 

    What letter or symbol is appended to the label of a modifying airmass that is cooler than the ground below?

    • Plus symbol.

    • Lower case c.

    • Lower case k.

    • Minus symbol.

    Correct Answer
    A. Lower case k.
    Explanation
    When a modifying airmass is cooler than the ground below, it is labeled with a lowercase "k". This indicates that the airmass is colder than the surface it is moving over. The other options, such as the plus symbol, lowercase c, and minus symbol, do not specifically indicate that the airmass is cooler than the ground.

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  • 9. 

    Where is the geographic area known as the "Great Plains" located?

    • West of the Rocky Mountains.

    • East of the Appalachian Mountains.

    • Between the Mississippi River and the Rocky Mountains.

    • Between the Appalachian Mountains and the Missouri River.

    Correct Answer
    A. Between the Mississippi River and the Rocky Mountains.
    Explanation
    The geographic area known as the "Great Plains" is located between the Mississippi River and the Rocky Mountains. This region spans across several states in the central United States, including parts of Montana, Wyoming, North Dakota, South Dakota, Nebraska, Kansas, Colorado, Oklahoma, Texas, and New Mexico. It is characterized by vast, flat grasslands, with few trees and a semi-arid climate. The Great Plains is an important agricultural region, known for its production of wheat, corn, and other crops.

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  • 10. 

    The spectrum width product is most effective when

    • Used alone.

    • Used with other products.

    • Displayed in 16 data levels.

    • Overlaid on composite reflectivity.

    Correct Answer
    A. Used with other products.
    Explanation
    The spectrum width product is most effective when used with other products. This is because the spectrum width provides information about the variability of the radar signal within a particular area, but it does not provide a complete picture of the weather conditions. By combining the spectrum width with other products such as reflectivity or velocity, meteorologists can gain a more comprehensive understanding of the atmospheric conditions and make more accurate weather predictions. Therefore, using the spectrum width product in conjunction with other products enhances its effectiveness.

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  • 11. 

    Aside from the Air Force Operational Weather Squadrons (OWS), what agency produces discussions on model output?

    • Joint Army Air Force Weather Information Network..

    • Air Force Weather Agency..

    • National Weather Service.

    • Air Weather Service.

    Correct Answer
    A. National Weather Service.
    Explanation
    The National Weather Service is the agency that produces discussions on model output, in addition to the Air Force Operational Weather Squadrons (OWS). The Joint Army Air Force Weather Information Network, Air Force Weather Agency, and Air Weather Service are not responsible for producing these discussions.

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  • 12. 

    In what tornado-producing airmass do tornadoes most frequently occur in families, with paths that are commonly long and wide?

    • Type II, Gulf Coast type.

    • Type I, Great Plains type.

    • Type III, Pacific Coast type.

    • Type IV, Inverted “V” type.

    Correct Answer
    A. Type I, Great Plains type.
    Explanation
    Tornadoes most frequently occur in families with long and wide paths in the Great Plains type of tornado-producing airmass. This region is known for its favorable atmospheric conditions for tornado formation, such as warm, moist air from the Gulf of Mexico colliding with cool, dry air from the Rocky Mountains. These conditions create strong wind shear and instability, which are essential for the development of tornadoes. The Great Plains region, stretching from Texas to North Dakota, is often referred to as "Tornado Alley" due to its high frequency of tornado occurrences.

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  • 13. 

    The color-coded root mean square of the displayed velocity azimuth display winds is related to what characteristic of the winds?

    • Strength

    • Altitude.

    • Direction.

    • Reliability.

    Correct Answer
    A. Reliability.
    Explanation
    The color-coded root mean square of the displayed velocity azimuth display winds provides information about the reliability of the winds. This means that the colors represent the level of confidence in the accuracy of the displayed wind data. The higher the reliability, the more confident we can be in the accuracy of the wind measurements.

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  • 14. 

    What weather feature is commonly found south of the center of a low pressure system and is indicated by a relatively cloud-free region?

    • Warm front.

    • Cold front.

    • Dry line.

    • Dry slot.

    Correct Answer
    A. Dry slot.
    Explanation
    A dry slot is commonly found south of the center of a low pressure system and is indicated by a relatively cloud-free region. It is a region of dry air that wraps around the low pressure system and can bring clear skies and drier conditions. This is in contrast to the other options, as a warm front is associated with warm air rising over cold air, a cold front is associated with cold air advancing towards warm air, and a dry line is a boundary between moist and dry air masses.

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  • 15. 

    Which decibel (dBZ) value is considered the approximate precipitable/non-precipitable threshold?

    • –30 dBZ.

    • –18 dBZ.

    • +18 dBZ.

    • +30 dBZ.

    Correct Answer
    A. +18 dBZ.
    Explanation
    The approximate precipitable/non-precipitable threshold is considered to be +18 dBZ. This means that any value below +18 dBZ is likely to indicate non-precipitation, while any value above +18 dBZ is likely to indicate precipitation.

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  • 16. 

    Embedded thunderstorms are detected by the Weather Service Radar (WSR)–88D quite well because

    • It uses airborne radar technology to seek out these storms.

    • The storms move much faster than the surrounding precipitation.

    • Its 10cm wavelength can see through the stratiform precipitation.

    • The storms move much slower than the surrounding precipitation.

    Correct Answer
    A. Its 10cm wavelength can see through the stratiform precipitation.
    Explanation
    The correct answer is "its 10cm wavelength can see through the stratiform precipitation." The Weather Service Radar (WSR)–88D is able to detect embedded thunderstorms well because it uses a 10cm wavelength that can penetrate through the stratiform precipitation. This allows the radar to see the thunderstorms that are hidden within the surrounding precipitation.

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  • 17. 

    The melting level is displayed on the composite reflectivity product as a

    • Straight line of higher reflectivities.

    • Circular pattern of higher reflectivities.

    • Series of ellipses centered over each snow shower.

    • Series of spots that show ice forming on the radome.

    Correct Answer
    A. Circular pattern of higher reflectivities.
    Explanation
    The melting level is displayed on the composite reflectivity product as a circular pattern of higher reflectivities. This is because the melting level represents the altitude at which precipitation changes from snow to rain. As the snowflakes melt and become raindrops, they become larger and more reflective, resulting in higher reflectivities on the radar. The circular pattern is formed because the melting level is typically a horizontal layer that extends outward from a central point, creating a circular shape on the radar display.

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  • 18. 

    Why is tornadic vortex signature detection beyond 55 nautical miles difficult?

    • Beam broadening.

    • Beam wander.

    • Scintillation.

    • Ducting.

    Correct Answer
    A. Beam broadening.
    Explanation
    Tornadic vortex signature detection beyond 55 nautical miles is difficult due to beam broadening. Beam broadening refers to the spreading out of the radar beam as it travels through the atmosphere. This causes the beam to cover a larger area, making it harder to accurately detect and identify tornadic vortex signatures at longer distances. The wider beam also increases the likelihood of interference and clutter, further hindering detection capabilities.

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  • 19. 

    What initial conditions are models used based upon?

    • Standard atmospheric conditions.

    • Previously forecasted conditions.

    • Current weather observations.

    • Model of choice conditions.

    Correct Answer
    A. Current weather observations.
    Explanation
    Models used in weather forecasting are based on current weather observations. These observations include data such as temperature, humidity, wind speed, and atmospheric pressure. By analyzing these current conditions, meteorologists can input the data into weather models to predict future weather patterns. This allows for more accurate and reliable forecasts. Standard atmospheric conditions, previously forecasted conditions, and model of choice conditions are not the basis for initial conditions in weather models.

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  • 20. 

    Where do multi-cell storms typically regenerate?

    • Along the gust front.

    • The rear-flank downdraft.

    • East of the westernmost cell.

    • North of the 700mb wind maximum.

    Correct Answer
    A. Along the gust front.
    Explanation
    Multi-cell storms typically regenerate along the gust front. The gust front is the leading edge of cool air that rushes out from a thunderstorm. As this cool air collides with warm, moist air, it can create new updrafts and initiate the formation of new thunderstorms. This process of regeneration along the gust front is common in multi-cell storms, which are composed of multiple individual cells that can develop and decay over time.

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  • 21. 

    When does the maximum severe activity occur with a major cyclone?

    • A few hours after sunrise to maximum heating.

    • From time of maximum heating to a few hours after sunset.

    • Just before and after maximum heating.

    • Only during maximum heating.

    Correct Answer
    A. From time of maximum heating to a few hours after sunset.
    Explanation
    The maximum severe activity occurs with a major cyclone from the time of maximum heating to a few hours after sunset. This is because during this period, the temperature is at its highest, which leads to increased atmospheric instability and energy for the cyclone to intensify. As the sun sets and the temperature starts to decrease, the severe activity gradually diminishes.

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  • 22. 

    The storm total precipitation product provides continuously updated information on precipitation accumulations within how many nautical miles of the radar?

    • 120.

    • 124.

    • 200.

    • 240.

    Correct Answer
    A. 124.
    Explanation
    The storm total precipitation product provides continuously updated information on precipitation accumulations within 124 nautical miles of the radar.

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  • 23. 

    If the velocity azimuth display (VAD) algorithm finds no difference between the zero velocity line and the zeroth harmonic, then the offset is zero, and the wind field is

    • Uniform.

    • Divergent.

    • Convergent..

    • Not determinable.

    Correct Answer
    A. Uniform.
    Explanation
    If the velocity azimuth display (VAD) algorithm finds no difference between the zero velocity line and the zeroth harmonic, it means that there is no variation in the wind speed and direction across the area being analyzed. This indicates a uniform wind field, where the wind is blowing at a constant speed and direction throughout the region.

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  • 24. 

    A velocity cross-section limitation causing small features at long distances to go undetected is

    • Beam broadening.

    • Product resolution.

    • Aliased velocity data.

    • Lack of height continuity.

    Correct Answer
    A. Beam broadening.
    Explanation
    Beam broadening refers to the spreading out of a radar beam as it travels through the atmosphere. This spreading effect can cause small features at long distances to become less distinguishable or undetected altogether. As the beam broadens, the resolution of the radar decreases, making it difficult to accurately detect and measure small targets. Therefore, beam broadening is the correct answer for the given question.

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  • 25. 

    The storm cell centroid algorithm performs best when

    • Solid lines of thunderstorms are present.

    • A mesoscale convective complex is present.

    • Embedded multicell thunderstorms are present.

    • Isolated, well-defined thunderstorms are present.

    Correct Answer
    A. Isolated, well-defined thunderstorms are present.
    Explanation
    The storm cell centroid algorithm is most effective when isolated, well-defined thunderstorms are present. This is because the algorithm is designed to track the center or centroid of individual storm cells. When thunderstorms are isolated and well-defined, it is easier for the algorithm to accurately identify and track the centroid of each storm cell. On the other hand, if solid lines of thunderstorms are present, it may be more challenging for the algorithm to distinguish and track individual storm cells within the line. Similarly, if a mesoscale convective complex or embedded multicell thunderstorms are present, the algorithm may struggle to accurately track the centroids due to the complex and interconnected nature of these storm systems.

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  • 26. 

    What number of feet must the freezing level be for most precipitation to reach the surface as snow?

    • 1,000.

    • 1,100.

    • 1,200.

    • 1,300.

    Correct Answer
    A. 1,200.
    Explanation
    The freezing level refers to the altitude at which the temperature drops below freezing. In order for precipitation to reach the surface as snow, the freezing level must be at or below the surface level. Among the given options, the freezing level of 1,200 feet is the closest to the surface level, making it the correct answer.

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  • 27. 

    Which data collection limitation of the reflectivity cross-section product causes reduced values at long ranges?

    • Range folding.

    • Velocity aliasing.

    • Beam broadening.

    • Decreased pulse length.

    Correct Answer
    A. Beam broadening.
    Explanation
    Beam broadening is the correct answer because it is a data collection limitation of the reflectivity cross-section product that causes reduced values at long ranges. Beam broadening refers to the spreading or widening of the radar beam as it travels further from the radar antenna. This results in a larger area being sampled at longer ranges, leading to a decrease in the reflectivity values observed.

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  • 28. 

    The storm track information product algorithm provides data on

    • Past positions of thunderstorms.

    • Forecasted positions of severe thunderstorms.

    • Past and present positions of severe thunderstorms.

    • Past, present, and future positions of thunderstorms.

    Correct Answer
    A. Past, present, and future positions of thunderstorms.
    Explanation
    The storm track information product algorithm provides data on the past, present, and future positions of thunderstorms. This means that it not only gives information about where thunderstorms have been in the past, but also where they are currently located and where they are predicted to move in the future. This comprehensive data allows for better tracking and forecasting of thunderstorms, which is important for preparedness and safety measures.

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  • 29. 

    Which type of airmass has cold air at all levels?

    • Type I Great Plains.

    • Type II Gulf Coast.

    • Type III Pacific Coast.

    • Type IV Inverted V.

    Correct Answer
    A. Type III Pacific Coast.
    Explanation
    Type III Pacific Coast airmass has cold air at all levels. This is because the Pacific Coast is influenced by the cold ocean currents, which results in the airmass being cooled from below. As a result, the airmass remains cold at all levels, making Type III the correct answer.

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  • 30. 

    The probability of severe hail algorithm will look for hail greater than

    • 1/4 inch.

    • 1/2 inch.

    • 3/4 inch.

    • 1 inch.

    Correct Answer
    A. 3/4 inch.
    Explanation
    The probability of severe hail algorithm is designed to identify hail that is larger than a certain size. In this case, the algorithm is looking for hail that is greater than 3/4 inch in diameter. This means that the algorithm will only classify hail as severe if it is larger than 3/4 inch, and any hail that is smaller than this size will not be considered severe.

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  • 31. 

    In straight line flow, what quadrants are the main diffluent areas of a jet maximum?

    • Left & right rear.

    • Left & right front.

    • Left front & right rear.

    • Left rear & right front.

    Correct Answer
    A. Left front & right rear.
    Explanation
    In straight line flow, the main diffluent areas of a jet are the left front and right rear quadrants. This means that the jet is spreading out more in these areas compared to the other quadrants.

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  • 32. 

    A strongly tilted storm may cause what kind of vertically integrated liquid values to be displayed?

    • Taller.

    • Lower.

    • Higher.

    • Shorter.

    Correct Answer
    A. Lower.
    Explanation
    A strongly tilted storm may cause lower vertically integrated liquid values to be displayed. This is because when a storm is strongly tilted, the vertical distribution of liquid within the storm becomes more spread out. As a result, the total amount of liquid from the surface to the top of the storm is reduced, leading to lower vertically integrated liquid values.

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  • 33. 

    Which region is not a primary source for airmasses?

    • Arctic.

    • Tropical.

    • Equatorial.

    • Temperate.

    Correct Answer
    A. Temperate.
    Explanation
    The temperate region is not a primary source for airmasses because it is located between the polar and tropical regions. Airmasses are formed in the polar and tropical regions due to the contrasting temperature and moisture conditions. The temperate region acts as a transition zone where airmasses from the polar and tropical regions mix and interact, but it is not a primary source for the formation of airmasses itself.

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  • 34. 

    When the Doppler zero line has a noticeable S-shaped pattern, winds are considered to be

    • From 270°.

    • Veering with height.

    • Backing with height.

    • Increasing with height.

    Correct Answer
    A. Veering with height.
    Explanation
    The Doppler zero line is a line on a Doppler radar display that represents the location where there is no motion towards or away from the radar. When the Doppler zero line has a noticeable S-shaped pattern, it indicates that the winds are changing direction with height. This is known as veering with height. Veering refers to a clockwise change in wind direction with increasing height. Therefore, the correct answer is veering with height.

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  • 35. 

    A limitation of the storm total precipitation product is that it

    • Has trouble with large-scale features.

    • Has trouble with small-scale features.

    • Gives us a limited post storm analysis.

    • Displays total precipitation accumulations.

    Correct Answer
    A. Has trouble with small-scale features.
    Explanation
    The storm total precipitation product is limited in its ability to accurately capture small-scale features. This means that it may struggle to accurately represent the precipitation amounts and patterns in localized areas within a storm. However, it is still able to display the total precipitation accumulations over the entire storm system.

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  • 36. 

    Which type of supercell thunderstorm is most commonly found along the dry line of west Texas?

    • Moderate-precipitation.

    • High-precipitation.

    • Low-precipitation.

    • Classic.

    Correct Answer
    A. Low-precipitation.
    Explanation
    Low-precipitation supercell thunderstorms are most commonly found along the dry line of west Texas. These types of storms have a lower amount of precipitation compared to other types of supercell thunderstorms. The dry line, which is a boundary between moist and dry air masses, creates an environment that is conducive for the formation of low-precipitation supercells. These storms typically have a higher potential for producing severe weather, such as large hail and strong winds, but have limited rainfall.

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  • 37. 

    Which zone is not a type of surface convergent zone?

    • Dry line.

    • Frontal boundary.

    • Land breeze front.

    • Outflow boundary.

    Correct Answer
    A. Land breeze front.
    Explanation
    A land breeze front is not a type of surface convergent zone. Surface convergent zones, such as dry lines, frontal boundaries, and outflow boundaries, occur when air masses with different characteristics come together and interact. However, a land breeze front refers to the boundary between cooler air over land and warmer air over water, which is a result of differential heating and not a convergence of air masses.

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  • 38. 

    For the Weather Service Radar (WSR)–88D to generate a base reflectivity product, the antenna must complete

    • One elevation slice.

    • One complete 360° circle.

    • An entire volume coverage pattern.

    • At least two complete volume coverage patterns.

    Correct Answer
    A. One elevation slice.
    Explanation
    The correct answer is one elevation slice. In order for the Weather Service Radar (WSR)-88D to generate a base reflectivity product, the antenna needs to complete one elevation slice. This means that the radar antenna scans a single vertical slice of the atmosphere at a specific elevation angle. This allows the radar to gather information about the reflectivity of precipitation in that particular slice of the atmosphere.

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  • 39. 

    Which product is used in the detection and location of rotating thunderstorms and in determining wind field characteristics?

    • Base reflectivity.

    • Base radial velocity.

    • Severe weather analysis.

    • Severe weather probability.

    Correct Answer
    A. Base radial velocity.
    Explanation
    Base radial velocity is used in the detection and location of rotating thunderstorms and in determining wind field characteristics. Radial velocity measures the speed and direction of motion of precipitation particles towards or away from the radar. By analyzing the radial velocity data, meteorologists can identify areas of rotation within thunderstorms, which can indicate the potential for tornado development. Additionally, the wind field characteristics can be determined by examining the radial velocity patterns, helping meteorologists understand the overall storm structure and dynamics.

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  • 40. 

    Which statement is not a use of the composite reflectivity product?

    • It is the first step in identifying significant weather features.

    • It can be used as a quick check on the overall reflectivity pattern.

    • It can be used to show the 3-D structure of the reflectivity pattern.

    • It provides an instant snapshot of the most important reflectivity features.

    Correct Answer
    A. It can be used to show the 3-D structure of the reflectivity pattern.
    Explanation
    The composite reflectivity product is not used to show the 3-D structure of the reflectivity pattern.

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  • 41. 

    The velocity azimuth display wind profile (VWP) can detect features such as

    • Wind shifts and jet streams.

    • Inversions and microbursts.

    • Convergence and divergence.

    • Thermal winds and forecasted time of a wind shift.

    Correct Answer
    A. Wind shifts and jet streams.
    Explanation
    The velocity azimuth display wind profile (VWP) is a type of radar display that shows the wind speed and direction at different altitudes. It is used to detect and analyze various atmospheric features. In this case, it is capable of detecting wind shifts and jet streams. Wind shifts refer to sudden changes in wind direction, which can be important for weather forecasting and aviation safety. Jet streams are strong, narrow bands of wind that flow high in the atmosphere and can have a significant impact on weather patterns. The VWP can identify these features, making it a valuable tool for meteorologists and aviation professionals.

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  • 42. 

    What is an important thing to keep in mind when requesting a velocity cross-section?

    • Storm motion.

    • The orientation of the storm.

    • Where the reflectivity cross-section was cut.

    • It must be either parallel, or perpendicular to, a radial.

    Correct Answer
    A. It must be either parallel, or perpendicular to, a radial.
    Explanation
    When requesting a velocity cross-section, it is important to keep in mind that it must be either parallel or perpendicular to a radial. This means that the cross-section should align with the direction of the storm's movement or be at a right angle to it. This is crucial because it allows for accurate analysis of the wind patterns and velocities within the storm, providing valuable information for weather forecasting and understanding the storm's behavior.

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  • 43. 

    Which characteristic is not one of the single-cell thunderstorm?

    • Storm motion equal to the mean wind in the lowest 5km to 7km.

    • Weak vertical and horizontal wind shear.

    • High winds and hail.

    • Frequent tornadoes.

    Correct Answer
    A. Frequent tornadoes.
    Explanation
    The characteristic that is not one of the single-cell thunderstorm is frequent tornadoes. Single-cell thunderstorms are typically short-lived and do not have strong enough updrafts to produce tornadoes. They are usually characterized by storm motion equal to the mean wind in the lowest 5km to 7km, weak vertical and horizontal wind shear, and high winds and hail. However, they are not known for frequently producing tornadoes.

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  • 44. 

    Which characteristic is not one of multi-cell thunderstorms?

    • Weak directional shear in the lower levels.

    • Straight-line or unidirectional profile.

    • Large hail near downdraft centers.

    • Short-duration tornadoes.

    Correct Answer
    A. Weak directional shear in the lower levels.
    Explanation
    Multi-cell thunderstorms typically exhibit a strong directional shear in the lower levels, which means that the wind direction changes significantly with height. This helps to organize the storm and maintain its structure. Therefore, weak directional shear in the lower levels is not a characteristic of multi-cell thunderstorms.

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  • 45. 

    What atmospheric event does a negative convective available potential energy indicate?

    • Increased warm moist air advection.

    • Decreased cold dry air advection.

    • Downward vertical motions.

    • Upward vertical motions.

    Correct Answer
    A. Downward vertical motions.
    Explanation
    A negative convective available potential energy indicates downward vertical motions in the atmosphere. This means that the air is sinking, which can lead to stable atmospheric conditions and inhibit the formation of storms or convective activity.

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  • 46. 

    The echo tops product is based on data from what other product?

    • Base velocity.

    • Spectrum width.

    • Base reflectivity.

    • Vertically integrated liquid.

    Correct Answer
    A. Base reflectivity.
    Explanation
    The correct answer is Base reflectivity. The echo tops product is based on data from the Base reflectivity product. Base reflectivity measures the intensity of radar echoes, indicating the presence and intensity of precipitation. By analyzing the base reflectivity data, meteorologists can determine the height at which the echoes reach a certain intensity, which is used to create the echo tops product. This product provides valuable information about the vertical extent of precipitation within a storm system.

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  • 47. 

    How many minutes do single-cell storms typically last?

    • 20 to 30.

    • 20 to 40.

    • 30 to 45.

    • 30 to 60.

    Correct Answer
    A. 30 to 60.
    Explanation
    Single-cell storms typically last between 30 to 60 minutes.

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  • 48. 

    What wind speeds do you focus on at the 200 and 30 millibar level for severe weather analysis?

    • 76 knots

    • 80 knots.

    • 86 knots.

    • 90 knots.

    Correct Answer
    A. 86 knots.
    Explanation
    The wind speeds that are focused on at the 200 and 30 millibar level for severe weather analysis are 86 knots.

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  • 49. 

    What weather characteristic does the 700 millibars no change line usually line up with?

    • Trough axis.

    • Surface front.

    • Low-level jet.

    • 850 millibar warm ridge.

    Correct Answer
    A. 850 millibar warm ridge.
    Explanation
    The 700 millibars no change line usually lines up with the 850 millibar warm ridge.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 17, 2014
    Quiz Created by
    Daronwilli
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