CAPTAIN'S LICENSE WEATHER Flashcards
Which weather instrument measures atmospheric pressure?
A) Beaufort Scale
B) Anemometer
C) Sling Spectrometer
D) Barometer
D
Which instrument is used to predict the approach of a low-pressure system?
A) Anemometer
B) Fathometer
C) Barometer
D) Thermometer
C
Atmospheric pressure at sea level is equal to
A) 14.7 pounds per square inch
B) 29.92 inches of mercury
C) 1013.25 millibars
D) All of the above
D
What is a common unit of measure for atmospheric pressure?
A) centimeters
B) inches
C) degrees
D) feet
B
Prior to reading an aneroid barometer, you should tap the face lightly with your finger to
A) expose any loose connections
B) demagnetize the metal elements
C) bring the pointer to its true position
D) contract and expand the glass face
C
The most important information to be obtained from a barometer is the
A) difference between the reading of the two pointers, which shows wind directions
B) last two figures of the reading, such as .87, .76, or .92
C) present reading of the pressure, combined with the changes in pressure observed in the recent past
D) weather indications printed on the dial (such as “cold”, “wet”, etc.) under the pointer
C
Fog is most commonly associated with a(n)
A) warm front at night
B) low pressure area
C) anticyclone
D) cold front in the spring
A
When warm moist air blows over a colder surface and is cooled below its dew point, the result is
A) radiation fog
B) ice fog
C) advection fog
D) frost smoke
C
A warm air mass is characterized by
A) stability
B) instability
C) gusty winds
D) good visibility
A
A boundary between two air masses is a(n)
A) lapse rate
B) isobar
C) front
D) continent
C
When a warm air mass overtakes and replaces a cold air mass, the contact surface is called a(n)
A) warm front
B) cold front
C) line squall
D) occluded front
A
What is typical of warm front weather conditions?
A) an increase in pressure
B) a wind shift from southwest to northwest
C) scattered cumulus clouds
D) steady precipitation
D
When cold air displaces warm air, you have a(n)
A) cold front
B) occluded front
C) stationary front
D) warm front
A
The wind circulation around a high pressure center in the Northern Hemisphere is
A) counterclockwise and moving toward the high
B) counterclockwise and moving outward from the high
C) clockwise and moving toward the high
D) clockwise and moving outward from the high
D
Good weather is usually associated with a region of
A) low barometric pressure
B) high barometric pressure
C) falling barometric pressure
D) pumping barometric pressure
B
When a low pressure area is approaching, the weather generally…
A) Improves
B) Worsens
C) Remains the same
D) Is unpredictable
B
A sea breeze is a wind…
A) That blows towards the sea at night
B) That blows towards an island during the day
C) Caused by cold air descending a coastal incline
D) Caused by the distant approach of a hurricane
B
A gale is characterized by a wind speed of…
A) 10 to 20 knots
B) 34 to 47 knots
C) 48 to 63 knots
D) 64 to 83 knots
B
The wind direction around a low pressure area in the Northern Hemisphere is…
A) Clockwise and inward
B) Clockwise and outward
C) Counterclockwise and inward
D) Counterclockwise and outward
C
The dew point is reached when the…
A) Temperature of the air equals the temperature of the seawater
B) Atmospheric pressure is 14.7 lbs. per square inch
C) Relative humidity reaches 50%
D) Air becomes saturated with water vapor
D
A generally circular low pressure area is called a(n)
A) cyclone
B) anticyclone
C) cold front
D) occluded front
A
The wind direction around a low pressure area in the northern hemisphere is
A) clockwise and inward
B) clockwise and outward
C) counterclockwise and inward
D) counterclockwise and outward
C
A sea breeze is a wind
A) that blows towards the sea at night
B) that blows towards land during the day
C) caused by cold air descending a coastal incline
D) caused by the distant approach of a hurricane
B
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
When cold air displaces warm air you have a(n)…
A) Cold front
B) Occluded front
C) Stationary front
D) Warm front
A
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
The “horse latitudes” are regions of…
A) Brisk prevailing winds
B) Light airs and calms
C) Abundant blue sea grass vegetation
D) None of the above
B
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 the low pressure toward high pressure deflected by the earth’s rotation
C
When warm moist air blows over a colder surface and is cooled below its dew point, fog forms as the cooling air reaches saturation the result is…
A) Radiation fog
B) Ice fog
C) Advection fog
D) Frost smoke
C
In the Northern Hemisphere a wind that shifts counterclockwise is a ……….
A) Veering wind
B) Backing wind
C) Reverse wind
D) Chinook wind
B
What is a common unit of measure for atmospheric pressure?
A) Centimeters
B) Inches
C) Degrees
D) Feet
B
Which cloud type is normally associated with thunderstorms?
A) Cirrus
B) Stratus
C) Cumulus
D) Cumulonimbus
D
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere is called…
A) Pressure gradient
B) Coriolis effect
C) Aurora borealis
D) Ballistic deflection
B
