AS352 TEST II 5/22/97

 

Please attempt all questions. Fill out all the answers on the scantron. All questions are multiple choice. One, and only one answer is correct.

 

1. What type of weather front would be responsible for the following weather forecast: "Increasing high cloudiness and cold this morning. Clouds increasing and lowering this afternoon with a chance of snow or rain tonight. Precipitation ending tomorrow morning. Turning much warmer. Winds light easterly today becoming southeasterly tonight and southwesterly tomorrow."

a. cold front

b. warm front

c. stationary front

d. warm-type occluded front

 

2. What type of clouds, if any, would you expect to see form when a cP air mass moves across warm water?

a. cirrus

b. stratus

c. nimbostratus

d. cumulus cloud streets

 

3. What type of clouds, if any, would you expect to see form when a mT air mass moves across a cold land surface?

a. none

b. altostratus

c. cumulonimbus

d. fog

 

4. Which below is not correct concerning an occluded front?

a. it is often associated with a broad band of precip

b. it marks a zone of shifting wind

c. it is colored purple on a surface weather map

d. at the surface it is always followed by colder air

 

5. When comparing an "average" cold front to an "average" warm front, which of the following is not correct?

a. generally, cold fronts move faster than warm fronts

b. generally, cold fronts have steeper slopes

c. generally, precipitation covers a much broader area with a cold front

d. especially in winter, cumuliform clouds are more often associated with cold fronts

 

6. Alternating lines of blue and red on a surface weather chart indicate:

a. a cold front

b. a warm front

c. a stationary front

d. an occluded front

 

7. A cold front on a weather map is always:

a. associated with precipitation

b. associated with a wind shift

c. followed by drier air

d. followed by cooler air

 

8. Which of the following is not correct concerning a cold front?

a. it marks the position of a trough of low pressure

b. it marks a zone of shifting winds

c. it is colored red on a weather map

d. it has cold air behind it

 

9. Before the passage of a cold front the pressure normally _____, and after the passage of a cold front the pressure normally _____.

a. drops suddenly, drops slowly

b. drops slowly, rises suddenly

c. rises, rises

d. rises suddenly, drops slowly

 

10. Squall lines most often form ahead of a:

a. cold front

b. warm front

c. cold-type occluded front

d. warm-type occluded front

e. stationary front

 

11. A "back door" cold front moving through New England would most likely have winds shifting from _____to _____.

a. easterly, westerly

b. westerly, northeasterly

c. southerly, westerly

d. southeasterly, southwesterly

e. westerly, southerly

 

12. Which of the following is not correct concerning a warm front?

a. it is colored red on a weather map

b. it has warm air ahead (in advance) of it

c. it is usually associated with stratiform clouds

d. it normally moves more slowly than a cold front

 

13. A halo around the sun or moon indicates that rain may be on the way because the halo indicates:

a. a cold front may be approaching

b. a warm front may be approaching

c. a sharp drop in atmospheric pressure

d. a sudden rise in surface dew point temperature

 

14. A frontal inversion aloft is most pronounced:

a. with a warm front in summer

b. with a stationary front in winter

c. with a cold front is summer

d. with a warm front in winter

 

15. The rising of warm air up and over cold air is called:

a. overrunning

b. frontolysis

c. frontogenesis

d. occlusion

 

16. During the winter you fly at 3000ft AGL from Burlington VT to Philadelphia PA. You did your weather briefing (for the heck of it) and you were told that you would be flying through a warm front. The most likely sequence of weather you would experience is:

a. snow, freezing rain, hail, sleet

b. rain, snow, sleet, freezing rain

c. freezing rain, snow, sleet, rain

d. snow, sleet, freezing rain, rain

 

17. The greatest contrast in both temperature and moisture will occur along the boundary separating which air masses?

a. cP and cT in summer

b. mP and mT in winter

c. cP and mT in summer

d. cP and mT in winter

e. mP and mT in summer

 

18. When cP air moves into the US Weat Coast from the east, the air mass is warmer at the surface than it was originally because:

a. the sun heats the air

b. the air sinks, is compressed, and warms

c. the ocean warms the air

d. friction with the ground warms the air

e. latent heat of condensation warms the air as it moves downhill

 

19. Clear sunny days with very cold nights would be associated with what type of air mass?

a. mP

b. mT

c. cP

d. cT

 

20. The lake effect snow occurs when _____ air mass moves over a _____ body of water.

a. an mT, colder

b. an mT, warmer

c. a cP, colder

d. a cP, warmer

 

21. Wintertime mP air masses are less common along the Atlantic coast of North America than along the Pacific coast mainly because:

a. the water is colder along the Pacific coast

b. the prevailing winds aloft are westerly

c. the source region for mP air on the Atlantic coast is western Europe

d. the water is warmer along the Atlantic coast

e. the land is colder along the Atlantic coast

 

22. The large thermally driven convection cell that is driven by convective "hot" towers along the equator is the:

a. Ferrel cell

b. Hadley cell

c. Ekman spiral

d. El Niño cell

 

23. The world's deserts are found at 30 latitude because:

a. the intertropical convergence zone is located there

b. of the sinking air of the polar front

c. of the convergence of the prevailing westerlies and the Northeast Trades

d. of the sinking air of the subtropical highs

e. of the doldrums

 

24. In the Northern Hemisphere, the polar jet stream is strongest when:

a. air north of the polar front is much colder than air south of the polar front

b. air north of the polar front is much warmer than air south of the polar front

c. air temperatures on opposite sides of the polar front are about equal

d. air temperatures on the East Coast of the US are much colder than on the West Coast of the US

 

25. The reversal of the positions of surface high and low pressure at opposite ends of the Pacific Ocean is called:

a. El Niño

b. the Southern Oscillation

c. upwelling

d. La Niña

 

 

b. high, low

c. low, low

d. low, high

22. Which of the statements below is not correct concerning the pressure gradient force?

a. the PGF points from high to low pressure in the Northern Hemisphere;

b. it is non-existent at the equator;

c. it can cause the wind to speed up or slow down;

d. the PGF points from high to low pressure in the Southern Hemisphere.

 

23. Buys-Ballot's law states that, "In the Northern Hemisphere, if you face the wind, then the lower pressure will be to your right." This simplification ignores surface friction. What would you have to do to still apply this law, in the presence of surface friction ?

a. turn clockwise about 30;

b. turn counterclockwise about 30;

c. stand on your head;

d. turn 30.

 

24. An example of microscale air motion is:

a. winds on a surface weather map of N. America;

b. winds on a 500 mb chart;

c. a sea breeze;

d. a wing tip vortex.

 

25. Clear Air Turbulence (CAT) can occur:

a. near a jet stream;

b. in areas of mountain waves;

c. where strong wind shear exists;

d. all of the above.

direction, as well as radar reflectivity;