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Meteorology
Chapter 9 Worksheet 3 Name: ________________________________
Circle the letter that corresponds to the correct answer 1. Why does occlusion lead to the demise of a mid‐latitude cyclone? a) The horizontal temperature gradient at the surface has been eliminated. b) The cold front stops progressing during occlusion. c) The cold cP air mass driving the cyclone has warmed intensely. d) Occlusion stops all precipitation from occurring within the cyclone. 2. Middle‐latitude cyclones in the Northern Hemisphere: a. have cold fronts but not warm fronts. b. travel from east to west. c. are large high‐pressure systems. d. rotate counterclockwise. 3. An area on the north side of the low‐pressure center of a middle‐latitude cyclone usually has this type of front for the longest period of time. a. occluded b. warm c. cold d. All three front types stay about the same amount of time. 4. A mature mid‐latitude cyclone cloud pattern most closely resembles what when viewed from a satellite? a) an octopus b) a starfish c) a comma d) a circle 5. Why is the number and intensity of wave cyclones greatest during the late fall, winter and spring months? a. Temperature contrasts are greater. b. Temperatures are below freezing. c. Density of the air is greatest. d. Air is drier then. e. Meteorologists do not know. 6. An approaching wave cyclone would be indicated by a ________ barometer reading. a. slowly rising b. very low c. rapidly falling d. high e. variable, rising then falling 7. When the center of a mature wave cyclone passes to the south, you should expect: a. generally fair weather. b. to experience a veering wind shift. c. backing winds and foul weather. d. absolutely nothing. 8. After a cold front passes, which of these does NOT usually occur? a. wind direction shift b. marked temperature drop c. drop in relative humidity d. clearing skies e. falling barometer 9. The wind direction in a low pressure system is: a. from the east. b. from the northwest. c. from the north. d. from the south. e. dependent on your location relative to the storm center. 10. What is the cause‐and‐effect relationship between the pattern of upper‐level winds and surface low‐ and high‐pressure systems? a. Surface systems depend primarily on wind speeds at upper levels. b. Upper level wind patterns strongly control the origin and development of surface systems. c. Surface lows decrease upper level wind speeds, surface highs increase them. d. There is no strong or consistent relationship. e. Surface systems control the upper level wind patterns. 11. Outside of the Great Lakes region, rising barometric pressure and a wind from the northwest generally mean that: a. severe weather is approaching. b. rain will occur within the next 3 hours. c. skies will clear. d. a blizzard is approaching. 12. A wind shift in a counterclockwise direction, as from east to north, is termed ________ wind shift. a. frontal b. veering c. cyclonic d. backing 13. A wind shift in a clockwise direction, as from south to west, is termed ________ wind shift. a. backing b. frontal c. veering d. anticyclonic 14. Middle‐latitude anticyclones in the Northern Hemisphere: a. rotate clockwise. b. travel from east to west. c. have cold fronts but not warm fronts. d. are large low‐pressure systems. 15. A ridge aloft is generally associated with: a. cyclonic flow at the surface. b. anticyclonic flow at the surface. c. divergence of the jet stream. d. stormy weather. 16. A trough aloft is generally associated with: a. cyclonic flow at the surface. b. convergence of the jet steam. c. clear skies. d. anticyclonic flow at the surface. 17. When speed divergence occurs in the upper atmosphere, what effect does it have on cyclogenesis? a. It can either inhibit or enhance cyclogenesis, depending on the surface air temperature. b. It inhibits cyclogenesis by preventing cyclonic flow. c. It greatly enhances cyclogenesis by increasing convergence on the surface below. d. It has no impact whatsoever on the formation of mid‐latitude cyclones. 18. Which of these best describes the reason most high pressure systems bring clear skies? a. high temperatures aloft b. sinking air aloft c. rising air aloft d. cold air near the surface e. low temperatures aloft 19. A midlatitude cyclone forms in western Canada, and very rapidly moves through the Dakotas and passes over the Great Lakes region, bringing very cold temperatures with it. This storm would probably be called a(an): a. Alberta Clipper. b. Panhandle Hook. c. Nor'easter. d. Siberian Express. 20. What kind of storm was the subject of the 1991 movie The Perfect Storm? a. a Panhandle Hook b. a Siberian Express c. a Nor'easter d. a hurricane 21. A blocking high is caused by: a. an occluded front. b. divergence in the upper atmosphere. c. a cutoff low. d. a persistent anticyclone. 22. The weather most typically associated with a blocking high is: a. a "backlog" of storms behind the high that leads to intense flooding. b. drought for the entire country. c. snow. d. severe thunderstorms and tornado outbreaks. Circle “T” if the statement is true or “F” if the statement is false T F 23. Much less study has been devoted to anticyclones as compared to cyclones. T F 24. When surface cyclones form, they almost invariably occur just ahead of an upper air ridge.
T F 25. Speed divergence helps maintain surface lows.
T F 26. Cyclones usually form alone, although sometimes they are associated with anticyclones.
T F 27. Most cyclones and anticyclones are generated by upper‐level air flow.
T F 28. Typically, upper‐level air flow is slower over anticyclones than over cyclones. T F 29. Cyclones pass over Oregon more often in winter than in summer.
T F 30. Cyclogenesis frequently occurs in Colorado.
T F 31. Cyclones usually move fastest in summer.
T F 32. Cyclogenesis refers to the birth of a cyclone.
Answer the following questions 33. Describe the favored locations for surface cyclones and anticyclones with respect to the upper‐level ridges and troughs. 34. What feature of the upper‐level wind pattern must exist for the origin and development of a surface low?