Exam 3 A

MEA 130 - EXAM 3 (A) 18 November 2019 1. Which of the following statements concerning air pressure (p) is true? a. it is the force exerted by the weight of a column of air above a given point b. ∆p/∆z > 0 c. it is the most “sensible” of the six weather elements we’ve learned about d. all of the above 2. At mean sea-level, the average barometric pressure is equal to: a. 14.7 inches of Hg b. 1013.25 lb in -2 c. 29.92 millibars d. none of the above 3. If a liquid with a much lower density than mercury is used in barometers, the instrument: a. would not provide an accurate measurement b. would have to be much taller in order to provide accurate measurement c. would have to be much shorter in order to provide accurate measurement d. would provide a much more accurate measurement 4. The first barometer, which was invented by Torricelli nearly 400 years ago, is most similar to which common barometer used today? a. aneroid b. Mercury c. electric d. barograph 5. provides rapid responses making it ideal for radiosondes. a. An aneroid barometer b. A liquid in glass barometer c. An electric barometer d. A mercury barometer 6. The station pressure observed at Boone, NC (elevation 1057 meters) is always its equivalent sea level pressure. a. much greater than b. equal to c. greater than d. much less than  Use a # 2 pencil to fill in your name (last name first, first name last) and id number on the answer sheet.  Question 51 will ask you which test version that you have (i.e. A).  Keep this copy of the exam, which you may write on, to 1) use as a study guide for the final exam, 2) check your answers against keys that will be posted on the class website.

Using the figure below, which depicts a cross-section of terrain and station pressure recorded at three stations, answer questions 7 - 9. 7. What is the equivalent sea-level pressure at Station C? a. 1025.3 mb b. 852.2 mb c. 987.1 mb d. 1041.3 mb 8. What is the equivalent sea-level pressure at Station B? a. 987.1 mb b . 991.1 mb c. 798.0 mb d. 1033.0 mb 9. Which station has the highest equivalent sea-level pressure? a. Station A b. Station B c. Station C d. Cannot determine 10. Which of the forces that we’ve learned about is responsible for making the air move? a. Coriolis Force (F CO ) b. Pressure Gradient Force (F PG ) c. Friction Force (F F ) d. none of the above 11. Which statement(s) below is correct concerning the Coriolis Force (F CO )? a. it is always directed 90 o to the right of the wind in the Northern Hemisphere b. it determines which direction water will flow down a drain c. its magnitude is always equal to zero at the poles d. all of the above -5 -1 Use the equation: F CO = 2 x V x Ω x sin Φ, where the rotation rate of the earth is 7.29 x 10 s calculate the Coriolis Force for the various combinations of wind speeds and latitudes below. 12. Wind speed = 20 m s -1 ; Latitude = 30 o , to a. 0.0015 m s -2 b. 0.0023 m s -2 c. 0.0025 m s -2 d. 0.0094 m s -2 13. Wind speed = 25 m s -1 ; Latitude = 70 o a. 0.0094 m s -2 b. 0 .0034 m s -2 c. 0.0102 m s -2 d. 0.0226 m s -2

23. A windrose is used to: a. illustrate the wind climatology of a location b. measure wind speed and direction c. measure wind speed only d. measure wind direction only 24. As discussed in class, the prevailing wind direction for the RDU area is from the: a. southwest b. northwest c. southeast d. northeast 25. The figure to the right illustrates flow associated with: a. an upper-level cyclone center b. an upper-level anticyclone center c. a surface-level anticyclone center d. a surface-level cyclone center 26. The figure to the right illustrates flow associated with: a. an upper-level low pressure center b. an upper-level high pressure center c. a surface-level high pressure center d. a surface-level low pressure center 27. Surface air the center of an anticyclone , resulting in and generally weather. a. diverges from; sinking air, nice b. converges toward; sinking air, inclement c. diverges from; rising air, nice d. converges toward; rising air; inclement Use the adjacent figure, which depicts the source regions of air masses impacting North America during the summer , to answer questions 28-30. 28. Source region(s) for cT air masses are: a. 3 and 4 b. 4, 5 and 6 c. 3 d. 4 29. Source region(s) for cP air masses are: a. 1 and 2 b. 1, 2 and 3 c. 3 d. 4 30. Source region(s) for mT air masses are: a. 5 and 6 b. 4, 5 and 6 c. 5 d. 6

31. Which of the following are characteristics of mid-latitude cyclones influencing the U.S.? a. they have life cycle of about one week b. most move from east to west c. they can have diameters up to 100 km d. all of the above 32. Which air mass is responsible for the monsoonal type thunderstorms that occur in Arizona and New Mexico during the summer? a. cT b. mP c. cP d. mT 33. The Alberta Clipper is an example of that tends to form . a. a mid-latitude cyclone; on the leeward side of mountains b. an airmass; on the leeward side of mountains c. a mid-latitude cyclone; in coastal locations d. an airmass; in coastal locations 34. The Polar Front, which is a semi-permanent, semi-continuous boundary separates: a. tropical air masses from maritime air masses b. continental air masses from maritime air masses c. tropical air masses from polar air masses d. continental air masses from tropical air masses 35. The greatest contrast in both temperature and moisture will occur along the boundary separating which two air masses? a. cP and cT b. mP and mT c. mP and cP d. mT and cP Questions 36-41 refer to the three adjacent figures depicting cross-sections of three of the four types of fronts we’ve discussed. 36. A Warm Front is depicted in Figure: a . (1) b. (2) c. (3) d. none 37. A Cold Front is depicted in Figure: a. (1) b . (2) c. (3) d. none 38. An Occluded Front is depicted in Figure: a. (1) b. (2) c . (3) d. none 39. Where, in Figure 2, would the surface pressure be lowest? (A) (B) (C) (D) 40. Where, in Figure 3, would the surface pressure be rising? ( A) (B) (C) (D) 41. Where, in Figure 2, would the surface temperature be warmest? (A) (B) (C) (D)