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Flashcards in USCG Meterology Deck (501)
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1

#1 The direction of the surface wind is __________.

A. directly from high pressure toward low pressure
B. directly from low pressure toward high pressure
C. from high pressure toward low pressure deflected by the earth's rotation
D. from low pressure toward high pressure deflected by the earth's rotation

C. from high pressure toward low pressure deflected by the earth's rotation

2

#2 Wind direction may be determined by observing all of the following EXCEPT __________.

A. low clouds
B. waves
C. whitecaps
D. swells

D. swells

3

#3 What will a veering wind do?

A. Change direction in a clockwise manner in the Northern Hemisphere
B. Circulate about a low pressure center in a counterclockwise manner in the Northern Hemisphere
C. Vary in strength constantly and unpredictably
D. Circulate about a high pressure center in a clockwise manner in the Southern Hemisphere

A. Change direction in a clockwise manner in the Northern Hemisphere

4

#4 A local wind which occurs during the daytime and is caused by the different rates of warming of land
and water is a __________.

A. foehn
B. chinook
C. land breeze
D. sea breeze

D. sea breeze

5

#5 A katabatic wind blows __________.

A. up an incline due to surface heating
B. in a circular pattern
C. down an incline due to cooling of the air
D. horizontally between a high and a low pressure area

C. down an incline due to cooling of the air

6

#6 Which Beaufort force indicates a wind speed of 65 knots?

A. Beaufort force 0
B. Beaufort force 6.5
C. Beaufort force 12
D. Beaufort force 15

C. Beaufort force 12

7

#7 On the pole side of the high pressure belt in each hemisphere, the pressure diminishes. The winds
along these gradients are diverted by the Earth's rotation toward the east and are known as the _______.

A. geostrophic winds
B. doldrums
C. horse latitudes
D. prevailing westerlies

D. prevailing westerlies

8

#8 In the doldrums you will NOT have __________.

A. high relative humidity
B. frequent showers and thunderstorms
C. steep pressure gradients
D. frequent calms

C. steep pressure gradients

9

#9 The area of strong westerly winds occurring between 40° S and 60° S latitude is called the ________.

A. polar easterlies
B. prevailing westerlies
C. roaring forties
D. jet streams

C. roaring forties

10

#10 The belt of light and variable winds between the westerly wind belt and the northeast trade winds is
called the __________.

A. subtropical high pressure belt
B. intertropical convergence zone
C. doldrum belt
D. polar frontal zone

A. subtropical high pressure belt

11

#11 The region of high pressure extending around the Earth at about 35° N latitude is called the _______.

A. prevailing westerlies
B. horse latitudes
C. troposphere
D. doldrums

B. horse latitudes

12

#12 According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a
northwest wind, the center of low pressure is located to the __________.

A. northeast
B. west-southwest
C. northwest
D. south-southeast

A. northeast

13

#13 Your position X is at LAT 35° S. Which winds are you experiencing? See Diagram: D009NG

A. Northeasterly
B. Northwesterly
C. Southeasterly
D. Southwesterly

A. Northeasterly

14

#14 Your vessel is on course 180° T speed 22 knots. The apparent wind is from 70° off the port bow,
speed 20 knots. The true direction and speed of the wind are __________.

A. 45° T, 21.0 knots
B. 51° T, 24.0 knots
C. 58° T, 21.2 knots
D. 64° T, 26.0 knots

B. 51° T, 24.0 knots

15

#15 In most cases, the direction of the apparent wind lies between the bow and __________.

A. the direction of the true wind
B. true north
C. the beam on the windward side
D. the beam on the lee side

A. the direction of the true wind

16

#16 The wind speed and direction observed from a moving vessel is known as __________.

A. coordinate wind
B. true wind
C. apparent wind
D. anemometer wind

C. apparent wind

17

#17 You are underway on course 050° T and your maximum speed is 13 knots. The eye of a hurricane
bears 120° T, 100 miles from your position. The hurricane is moving towards 265° T at 25 knots. What
course should you steer at 13 knots to have the maximum CPA?

A. 324° T
B. 306° T
C. 299° T
D. 276° T

A. 324° T

18

#18 The usual sequence of directions in which a tropical cyclone moves in the Southern Hemisphere is
__________.

A. northwest, west, and south
B. southwest, south, and southeast
C. north, northwest, and east
D. west, northwest, and north

B. southwest, south, and southeast

19

#19 Which condition exists in the eye of a hurricane?

A. Wind rapidly changing direction
B. A temperature much lower than that outside the eye
C. Towering cumulonimbus clouds
D. An extremely low barometric pressure

D. An extremely low barometric pressure

20

#20 Tropical cyclones normally form within which of the following belts of latitude?

A. 5° to 15°
B. 15° to 30°
C. 30° to 45°
D. 45° to 60°

A. 5° to 15°

21

#21 A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the
following EXCEPT__________.

A. higher than normal swells
B. high winds
C. winds veering from south, through west, to northwest
D. gradual pressure gradient

D. gradual pressure gradient

22

#22 You are enroute from Puerto Rico to New York. A hurricane makes up and is approaching. If the wind
veers steadily, this indicates that your vessel is __________.

A. in the dangerous semicircle
B. in the navigable semicircle
C. directly in the path of the storm
D. in the storm center

A. in the dangerous semicircle

23

#23 Low pressure disturbances, which travel along the intertropical convergence zone, are called _____.

A. permanent waves
B. tidal waves
C. tropical waves
D. tropical storms

C. tropical waves

24

#24 The approximate distance to a storm center can be determined by noting the hourly rate of fall of the
barometer. If the rate of fall is 0.08-0.12 inches, what is the approximate distance to the storm center?

A. 50 to 80 miles
B. 80 to 100 miles
C. 100 to 150 miles
D. 150 to 250 miles

B. 80 to 100 miles

25

#25 What kind of weather would you expect to accompany the passage of a tropical wave?

A. Heavy rain and cloudiness
B. Good weather
C. A tropical storm
D. Dense fog

A. Heavy rain and cloudiness

26

#26 Tropical cyclones are classified by form and intensity. Which system does not have closed isobars?

A. Hurricane
B. Tropical disturbance
C. Tropical depression
D. Cyclone

B. Tropical disturbance

27

#27 A tropical wave is usually preceded by __________.

A. tropical storms
B. good weather
C. heavy rain and cloudiness
D. heavy seas

B. good weather

28

#28 Ocean swells originating from a typhoon can move ahead of it at speeds near __________.

A. 10 knots
B. 20 knots
C. 30 knots
D. 50 knots

D. 50 knots

29

#29 The highest frequency of tropical cyclones in the North Atlantic Ocean occurs during __________.
A. January, February and March
B. April, May and June
C. August, September and October
D. July, November and December

C. August, September and October

30

#30 Recurvature of a hurricane's track usually results in the forward speed __________.

A. increasing
B. decreasing
C. remaining the same
D. varying during the day

A. increasing