Name Roy G Biv Weather Unit Test

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1) 2)

3) 4)

1 The diagram below shows the flow of air over amountain from point A to point C. Which graphbest shows the approximate temperature changeof the rising and descending air due to theadiabatic process?

1) air temperature 2) air pressure3) relative humidity 4) elevation

2 The cartoon below shows a strong wind blowingfrom right to left.

The wind is blowing from right to left becausethe region to the right has a higher

Base your answer to the following question onthe graph below which shows the airtemperature and dewpoint temperature over a24-hour period for a location in New York State.

1) 6 p.m. Monday 2) 6 a.m. Tuesday3) 3 p.m. Tuesday 4) 12 noon Tuesday

3 The air's capacity to hold water vapor wasgreatest at

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1) decreases, only2) increases, only3) remains the same4) decreases, then increases

4 As altitude within the troposphere increases, theamount of water vapor generally

1) temperature of the air above the landmasses is greater

2) specific heat of the land masses is greater3) temperatures of the bodies of water are

greater4) air over the bodies of water becomes heavier

with additional water vapor

5 On sunny summer days, a breeze often developsthat blows from large bodies of water towardnearby land masses because the

1) water vapor 2) methane3) nitrogen 4) ozone

6 Which gas in Earth's upper atmosphere isbeneficial to humans because it absorbs largeamounts of ultraviolet radiation?

1) -10°C and 16% 2) -10°C and 50%3) 4°C and 16% 4) 4°C and 50%

7 A sling psychrometer shows a dry-bulb reading of14°C and a wet-bulb reading of 9°C. What are thedewpoint and the relative humidity?

1) –28°C 2) 2°C 3) 6°C 4) 9°C

8 What is the dewpoint temperature when therelative humidity is 30% and the air temperatureis 20°C?

1) 2)

3) 4)

9 Which diagram below best represents the aircirculation around a Northern Hemispherelow-pressure center?

1) southeast 2) northeast3) southwest 4) northwest

10 The map below shows a low-pressure systemlocated over an area in the south-central UnitedStates.

In the next few days, because of the prevailingwinds, the air mass will probably move towardthe

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1) A and B 2) B and D3) C and E 4) A and D

11 The map below shows high-pressure andlow-pressure weather systems in the UnitedStates.

Which two lettered positions on the map aremost likely receiving precipitation?

Base your answer to question 12 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.

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2)

3)

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12 Which map best shows the most probable areasof precipitation associated with these weathersystems?

Base your answer to question 13 on the diagram below which represents a surface weather map of a portion of the United States. The map shows a low-pressure system with frontal lines and five weather stations A through E. Note that part of the weather datais missing from each station. [All temperaturesare in ºF.]

1) 988 millibars 2) 990 millibars3) 994 millibars 4) 997 millibars

13 The atmospheric pressure at the center of thelow would most likely be

1) 1,015 mb 2) 1,017 mb3) 1,020 mb 4) 1,023 mb

14 An air pressure of 30.21 inches of mercury isequal to approximately

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Base your answer to question 15 on the weather map of North America below. A grid system of letters and numbers is provided along the edges of the map to assist in finding locations. Letters W, X, and Y represent locations on the map. Isobars are labeled in millibars. The map shows weather conditions on May 15 when it is 9 a.m. in New York State.

1) occluded 2) stationary3) warm 4) cold

15 Which type of front is located between X and Y?

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1)

2)

3)

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16 On which map do the arrows correctly show thesurface wind pattern for the high- andlow-pressure centers shown on the northernpart of the weather map of North America?

1) anemometer 2) wind vane3) psychrometer 4) thermometer

17 Which weather instrument is used to measurewind speed?

1) wind speed 2) precipitation3) cloud cover 4) air pressure

18 A weather instrument is shown below.

Which weather variable is measured by thisinstrument?

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Base your answers to questions 19 and 20 on the cross section and bar graph below. Thecross section shows a portion of Earth’s ernst along the western coast of the UnitedStates. The points show different locations on Earth’s surface. The arrows show theprevailing wind direction. The bar below each point shows the yearly precipitation at thatlocation.

19 Explain why the valleys in the path of the descending air tend to have drier air

20 On the diagram above, draw a cloud in a location where its formation is most likely to occur.

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Base your answers to questions 21 through 24 on the weather map below, which shows aweather system over the northeastern United States and weather data for severallocations. Isobars show a low-pressure (L) center. Point X is a location in Canada.

21 Describe how clouds form when warm, humid airrises along the cold front.Include the terms dewpoint, adiabatic, and condensation in your answer.

22 Describe the five specific weather conditionsfor Charleston indicated by the station modelon the weather map. Complete the chartprovided above and include appropriate unitswhere necessary.

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23 State the relationship between isobar spacingon the map and wind velocity.

24 On the weather map on page 8, draw a curved arrowthrough point X to show the general directionof surface winds on that side of thelow-pressure center.

Base your answer to question 25 on the diagram below which shows warm, moist air moving off the ocean and over a mountain, causing precipitation between points 1 and 2.

25 Describe two changes that occur to the warm,moist air between points 1 and 2 that wouldcause cloud formation.

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Base your answer to question 26 on the diagram below, which represents water molecules attached to salt and dust particles within a cloud in the atmosphere.

26 Explain why salt and dust particles areimportant in cloud formation.

Base your answers to questions 27 and 28 on the cross section below, which shows a typicalcold front moving over Florida in early summer.

27 Explain why the warm, moist air is rising at thefrontal boundary.

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28 Central Canada was the geographic source region for the cP air mass shown in the cross section. Identify the most likely geographic source region for the mT air mass shown in the cross section.

Base your answer to question on the atmospheric cross section below, which represents a winter storm system. Zones A, B, C, and D are located on a west to east line at approximately 43° N latitude across New York State. This cross section shows how solid and liquid forms of precipitation depend on the air temperature above Earth’s surface. The storm is moving from west to east.

29 At the time of the events represented by the cross section, Syracuse, New York, is experiencing the weather conditions shown above.

The temperature, dewpoint, and wind direction are shown on the weather station model above. Using proper format, add the information shown in the table to the model provided above.

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30 The diagram below shows conditions that commonly cause fog to form over land in coastal areas.

A weather station at the lighthouse records a temperature of 36°F and an air pressure of 1016.4 mb. Using the proper weather map symbols, place the following information in the correct positions on the weather station model below.

Present weather Dewpoint Air pressure Wind direction Wind speed

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19 Responses include,but are not limited to:The air on the westernslopes of themountains is rising;The valleys arelocated on the easternside of the mountainranges where air issinking; Air iswarmed bycompression as itdescends themountain slopes, sorelative humiditydecreases.

20 Responses include,but are not limited to:The air on the westernslopes of themountains is rising;The valleys arelocated on the easternside of the mountainranges where air issinking; Air iswarmed bycompression as itdescends themountain slopes, sorelative humiditydecreases.

21 a: •Clouds form whenrising air expands andcools to the dewpoint.

b: • from gas to liquid• Water vapocondenses. •deposition • gas tosolid

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23 • Closely spacedisobars represent aregion of high windvelocity.• As isobars becomcloser, wind speedincreases.

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25 Examples: Air rises;Air expands; Aircools; Thetemperature reachesthe dewpoint; Watervapor condenses

26 Responses include,but are not limited to:Water droplets formon the surfacesprovided by the saltand dust particles;Salt and dust particlesare condensationnuclei, allowing thewater vapor to changeinto liquid drops,forming clouds.

27 Responses include butare not limited to:Warm, moist air isless dense than cold,Dry air; Cold air ismoving under thewarm air and forcingthe warm air upward.

28 Responses include,but are not limited to:Gulf of Mexico; Awarm ocean surface

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