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Chapter 8 Worksheet 2 Name: ________________________________
Circle the letter that corresponds to the correct answer 1) If the lowercase letter k appears at the end of an air mass identification code, what can be said about the changes likely to happen within that air mass? a) The air mass is likely to become more unstable. b) The air mass is likely to become more stable. c) The air mass will not undergo any air mass modifications. d) The expected air mass modifications are impossible to predict. 2) A warm, moist air mass from the Gulf of Mexico that moves over the land in the southeastern U.S. during the summer is likely to be classified as: a) mTk b) mTw c) mEk d) mWk 3) Why is Maritime Arctic left out of the air‐mass classifications? a) They do not occur. b) They only rarely occur. c) They occur every ten years. 4) Which two air masses are bitterly cold and very dry? a) cA and cP b) cT and mP c) cA and mP d) cP and cT 5) Which of the following air masses probably has the lowest water vapor content? a) cE b) cT c) cP d) cA 6) Which of these is NOT a process by which air masses are modified? a) calm winds b) lifting over mountains c) evaporation of water d) cooling from below e) heating from below 7) An air mass from the Gulf of Mexico that moves northward over the U.S. in winter would be labeled: a) cTw. b) mTk. c) mPw. d) cTk. e) mTw. 8) When an air mass is warmer than the surface over which it is moving: a) the letter k is added after the air mass symbol. b) visibility within the air mass is usually very good. c) the air becomes more stable. d) the lapse rate in the air mass is increased. 9) The stability of an air mass can be affected by: a) cyclones. b) mountain ranges. c) anticyclones. d) mountain ranges, cyclones, and anticyclones. 10) An air mass is often modified as it moves over the earth's surface. This modification is largely due to: a) lifting along fronts. b) contact with the new surface below. c) clouds. d) jet streams above. e) strong pressure gradients. 11) An air mass moves out of its source region. Two days later, the lower layers of the air mass are found to be warmer than they were originally. What letter should be added to the end of the air mass's classification code? a) k b) w c) m d) c 12) Where do cA air‐masses originate? a) Arctic basin and Greenland ice cap b) Interior Canada and Alaska c) Northwestern Atlantic d) Patagonia 13) What weather is associated with cA air masses? a) occasional periods of clear, cool weather in the summer b) cold waves in winter c) hot humid conditions leading to cumulus cloud development and showers or thunderstorms d) nor'easters 14) Air mass modifications produced by cyclones or topography rather than surface temperatures are called: a) mechanical modifications. b) thermal modifications. c) synoptic modifications. d) microscale modifications. 15) The air masses that have the greatest influence on weather conditions in the Midwestern United States are: a) mP and mA. b) mT and cT. c) mP and cP. d) cP and mT. e) cT and cP. 16) Which of the following is not an air mass that influences North America? a) mA b) cP c) mT d) cA e) mP 17) The coldest and driest winter air‐mass in North America is the: a) cP. b) mP. c) mT. d) cT. e) cA. 18) The pronounced cooling that occurs on continents at high latitudes during winter leads to the formation of ________ air masses. a) mA b) cM c) mP d) cP e) cT 19) In North America the ________ air mass forms only in the summer. a) mP b) cT c) mT d) cP 20) Which air mass does not usually influence weather in the United States during the summer? a) cA b) cP c) cT d) mP 21) Siberian Express is the term used when: a) an outbreak of bitterly cold air from Canada intrudes over a large part of the United States. b) a modified air mass originating in Siberia reaches the Pacific Northwest. c) an unusually cold air mass enters the Rocky Mountains. d) an mP air mass from the north Atlantic enters New England and generates snowfall. 22) What term would a meteorologist give to the weather event represented on the map above? a) The Polar Express b) The Pineapple Express c) mP Express d) The Siberian Express 23) Consider the map above. What air mass is the most likely to be found in Florida, just ahead of the cold front? a) mP b) mT c) cP d) mA Circle “T” if the statement is true or “F” if the statement is false T F 24. The symbol used when classifying Maritime Polar air masses is MP.
T F 25. The lower‐case letter m or c is used to designate the nature of the surface in the source region and hence the humidity characteristics of the air mass. T F 26. An air mass can not be modified when moving across country.
T F 27. The properties of air masses change little, even if they travel thousands of kilometers.
T F 28. As wintertime cP or cA air moves outward from its source region, it carries its warm wet weather to the United States. T T T T T T T T F F F F F F F F 29.
cP and cA air masses are never experienced in the southern U.S.
When an air mass is warmer than the surface over which it moves, an inversion is likely.
An air mass with the designation k is likely to become more unstable. Visibility is generally better in a w air‐mass than in a k air‐mass.
Continental polar air masses do not form in the summer in North America. Orographic precipitation in the western U.S. is often associated with the Pacific mP air mass.
Siberian Express weather events are generally confined to Alaska and western Canada.
Lake‐effect snow occurs only during the early spring.
Answer the following questions 37. Name two source regions for Maritime Tropical air masses. 38. Why are the boundary zones of air masses of special concern? 39. Name the three air mass types most important for the continental U.S.