Loudoun County Public Schools / Overview



ANSWER KEYStudy Guide – Air Masses, Fronts & Station Models 1. What is an air mass? An air mass is a large body of air with uniform temperature and uniform moisture.2. If a continental polar air mass moved over the Ashburn area, what would change? Temperatures and humidity would decrease. (It would become colder and drier)3. How are Air Masses classified? Air masses are classified by temperature and humidity.4. Which air mass causes most of the precipitation in the eastern United States? Maritime Tropical over the Caribbean Sea.5. Which two air masses mainly influence much of the east coast? Maritime Tropical and Continental Polar.6. Why does the Continental Tropical air mass centered over Mexico have little influence on weather in the east? Air Masses don’t travel far from their source regions.7. Air masses that form over land are called Continental; Air masses that form over water are called Maritime8. What is a warm front? The boundary between advancing warm air mass & a colder air mass it is displacing.9. What kind of front forms when a cold air mass overtakes a warm air mass? A cold front10. What happens along stationary fronts? The front stops moving forward, producing clouds & precipitation.11. What kind of weather is associated with cold fronts? Wind, heavy rain, Thunderstorms, Lightning, clearing and colder air after front passes.12. What forms at the boundary between two different air masses? A front13. Which types of fronts are most likely to produce thunderstorms? Cold and Occluded fronts14. Which type of front is the most complex because it involves 3 different air masses? Occluded fronts15. Which type of front would you see cirrus clouds a day before rain showers? Warm frontsFill in the blank:16. The Continental tropical air mass can cause very hot, drought-like conditions during summer on the Great Plains.17. Heavy rain, on the windward slopes of mountains near the Pacific NW is caused by the uplift of air in Maritime polar air masses.18. A Cold or Occluded front can bring heavy rain and thunderstorms.19. At a(n) Stationary front, the flow of air stops moving forward. Please answer the following in complete sentences:20. a) A warm, moist air mass moves northwest over a cool, dry area. How will the air mass affect the temperature and humidity of the area it moves over? It will bring warmer temperatures and higher humidity (and possibly rain)20. b) How will this affect the temperature and humidity of the air mass itself? The air mass will eventually cool down and become drier.Use the figure below to answer the following questions:-95250111125003059430217170GG62865210820AA1259205203835CC21. Which air masses bring cool, dry air to large regions of eastern North America? Continetal Polar and Continental Arctic (air masses labeled C & E)190119026035 E E22. The air masses labeled A & G are classified as Maritime Polar23. The air masses labeled B and F bring warm, moist air to the United States.139319097155DD2342515208280FF121285258445BB24. The air mass labeled D would be represented by the symbol cT.25. The air mass labeled E would be represented by the symbol cP.014699000Below is a diagram showing a cross section of two fronts commonly found along a low pressure weather system in the United States. Complete the diagram by labeling and drawing the information requested and them answer questions 27-30.*Draw and label the following on the diagram:Cumulonimbus Clouds, Nimbostratus Clouds, Cirrus Clouds, Cold Front, Warm Front, Clear Skies27. Along which front would thunderstorms and possible tornadoes be found? Cold Front28. Which city is having gentle rains? City C29. Which city is having heavy rainfall? City A30. Which city will experience the weather along the cold front next? City B31-34. Draw the symbol meteorologists use to indicate each of the following fronts on a weather map. Stationary Front Warm Front Cold Front Occluded Front548640048260002095504826000202882538735003848100387350035. Record the following weather conditions from the station model provided:190504572000SE - Wind Direction 75oF - Temperature in (Fo) 50% - Cloud Coverage (%) 66oF - Dew point (Fo)1002.5 mb - Pressure (mb) -1.3 mb - Pressure Trend (mb)25 knots - Wind Speed (knots) Thunderstorms - Current Weather ................
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