Download Name Air Masses/Fronts

Name
Air Masses/Fronts
1. Base your answer to the following question on the weather map below, which shows a
low-pressure system over the central United States. Isobars are labeled in millibars. Points A, B,
C, and D represent locations on Earth's surface.
The circulation of surface winds associated with this low-pressure system is
A)
B)
C)
D)
clockwise and toward the center of the low
clockwise and away from the center of the low
counterclockwise and toward the center of the low
counterclockwise and away from the center of the low
2. The air over the Equator generally rises because
the air is
A)
B)
C)
D)
dry and cool with low density
moist and hot with low density
moist and cool with high density
dry and hot with high density
3. Winds are blowing from high-pressure to
low-pressure systems over identical ocean
surfaces.Which diagram represents the area of
greatest windspeed? [Arrows indicate wind
direction.]
A)
B)
C)
D)
4. Which map correctly shows the wind directions of
the high-pressure and low-pressure systems?
A)
B)
C)
D)
5. A cross section of a weather front is shown below.
Which symbol would be used to represent this front on a weather map?
A)
B)
C)
D)
6. The map below shows surface air temperatures, in degrees Fahrenheit, reported by weather
stations in the north-central United States. Letter X represents an air mass moving in the direction
shown by the arrow. A line marks a frontal boundary advancing in a southeasterly direction.
Which weather-map symbols best represent air-mass X and the frontal boundary shown on the
map?
A)
B)
C)
D)
7. Air masses are identified on the basis of
temperature and
A)
B)
C)
D)
type of precipitation
wind velocity
moisture content
atmospheric transparency
Base your answers to questions 8 through 10 on the weather map below, which shows a
high-pressure center (H) and a low-pressure center (L), with two fronts extending from the
low-pressure center. Points X and Y are locations on the map connected by a reference line.
8. Which map best shows the most probable areas of precipitation associated with these weather
systems?
A)
B)
C)
D)
9. Which cross section best represents the fronts and air movements in the lower atmosphere along
line XY?
A)
B)
C)
D)
10. Which type of front is located between Buffalo and Detroit?
A) stationary
B) warm
C) occluded
D) cold
11. Base your answer to the following question on the graph below, which shows air temperature,
dewpoint, and present weather conditions for a 23-hour period at Dallas, Texas.
The thunderstorm that occurred between 11 p.m. and 12 midnight was most likely the result of
A)
B)
C)
D)
the arrival of a warm front
the arrival of a cold front
an increase in the difference between air temperature and dewpoint
an increase in both air temperature and dewpoint
12. Which type of air mass is associated with warm,
dry atmospheric conditions?
A) cP
B) cT
C) mP
D) mT
13. Base your answer to the following question on the weather map below, which shows the location
of fronts and the temperature field on a given day in the United States.
The passage of a cold front most recently influenced the weather of which two cities?
A) Chicago and Boise
C) Kansas City and Minneapolis
B) Las Vegas and Salt Lake City
D) Detroit and Cincinnati
14. Which type of air mass would most likely have low
humidity and high air temperature?
A) cT
B) cP
C) mT
D) mP
15. The weather characteristics of air mass result
primarily from its
A)
B)
C)
D)
geographic origin
size and shape
rate of movement
direction of movement
16. The diagram below represents a cross section of air masses and frontal surfaces along line AB.
The dashed lines represent precipitation.
Which weather map best represents this frontal system?
A)
B)
C)
D)
17. Which statement best explains why precipitation
occurs at frontal boundaries?
A) Cold fronts move slower than warm fronts.
B) Cold fronts move faster than warm fronts.
C) Warm, moist air sinks when it meets cold, dry
air.
D) Warm, moist air rises when it meets cold, dry
air.
18. The weather map below shows two air pressure
systems covering a large geographic area. Points
A through D identify four locations on the map.
At which location is precipitation most likely
occurring?
A) A
B) B
C) C
D) D
19. An airmass originates with its center located at
25° N and 90° W.
Based on the map, this air mass would be
classified as
A) cP
B) mP
C) cT
D) mT
Base your answers to questions 20 through 22 on the weather map below and on your
knowledge of Earth science. The weather map shows a typical low-pressure system and
associated weather fronts labeled A and B. The L indicates the center of the low-pressure
system. A few New York State cities are shown. Symbols cP and mT represent different air
masses. The wind direction at Utica and Rochester is shown on the station models.
20. Which map shows the regions that are most likely experiencing the precipitation associated with
this weather system?
A)
B)
C)
D)
21. Which front symbols are drawn correctly, based on the air masses shown?
A)
B)
C)
D)
22. If this weather system is following a normal storm track, the center of this low is most likely
moving toward which city?
A) Buffalo
B) Ithaca
C) Utica
23. The diagram below shows how prevailing winds
cause different weather conditions on the
windward and leeward sides of a mountain range.
D) Plattsburgh
24. Base your answer to the following question on The
cross section below shows the direction of air
flowing over a mountain. Points A and B are at
the same elevation on opposite sides of the
mountain.
Clouds usually form on the windward sides of
mountains because this is where air
A) rises and cools
C) sinks and cools
B) rises and warms
D) sinks and warms
Compared to the air temperature and humidity at
point A, the air temperature and humidity at point
B are usually
A)
B)
C)
D)
cooler and drier
cooler and wetter
warmer and drier
warmer and wetter
25. In the diagram below, arrows represent air
movement near an ocean coastline on a summer
afternoon.
Compared to the air over the ocean, the air over
the land has a
A) lower temperature and lower barometric
pressure
B) lower temperature and higher barometric
pressure
C) higher temperature and lower barometric
pressure
D) higher temperature and higher barometric
pressure