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Mariners Learning System
Marine Weather
32
Other
Professional
04/29/2017

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Cards

Term

A sea breeze is a wind...

Select one:

a. That blows towards land during the day

b. Caused by the distant approach of a hurricane

c. That blows towards the sea at night

d. Caused by cold air descending a coastal incline

Definition
a. That blows towards land during the day
Term

The wind speed and direction observed from a moving vessel is known as ________________.

Select one:

a. coordinate wind

b. anemometer wind

c. apparent wind

d. true wind

Definition
c. apparent wind
Term

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

Select one:

a. Land breeze

b. Sea breeze

c. Chinook

d. Foehn

Definition
b. Sea breeze
Term

A generally circular low pressure area is called a(n)...

Select one:

a. Cold front

b. Cyclone

c. Anticyclone

d. Occluded front

Definition
b. Cyclone
Term

What is the primary source of earth's weather?

Select one:

a. The moon

b. The sun

c. The solar system

d. The oceans

Definition
b. The sun
Term

On a weather map, a large letter "H" means...

Select one:

a. Horse latitudes, with rough seas and strong winds

b. A heavy squall line near the "H"

c. A high pressure area with cool, dry air, and fair weather

d. A high pressure area with warm, moist air, and inclement weather

Definition
c. A high pressure area with cool, dry air, and fair weather
Term

What will a veering wind do?

Select one:

a. Circulate about a low pressure center in a counterclockwise manner in the Northern Hemisphere

b. Circulate about a high pressure center in a clockwise manner in the Southern Hemisphere

c. Vary in strength constantly and unpredictably

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

Definition
d. Change direction in a clockwise manner in the Northern Hemisphere
Term

What is a common unit of measure for atmospheric pressure?

Select one:

a. Centimeters

b. Degrees

c. Feet

d. Inches

Definition
d. Inches
Term

Which cloud type is normally associated with thunderstorms?

Select one:

a. Cumulus

b. Stratus

c. Cirrus

d. Cumulonimbus

Definition

d. Cumulonimbus

Term

When a low pressure area is approaching, the weather generally...

Select one:

a. Improves

b. Remains the same

c. Worsens

d. Is unpredictable

Definition
c. Worsens
Term

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...

Select one:

a. Advection fog

b. Frost smoke

c. Ice fog

d. Radiation fog

Definition
a. Advection fog
Term

When facing into the wind in the Northern Hemisphere the center of low pressure lies ________________.

Select one:

a. directly behind you

b. directly in front of you

c. to the left and behind you

d. to your right and somewhat behind you

Definition
d. to your right and somewhat behind you
Term

After a cold front passes, the barometric pressure _______________.

Select one:

a. remains the same

b. remains the same, with clouds forming rapidly

c. fluctuates

d. usually rises, often quite rapidly, with clearing skies

Definition
d. usually rises, often quite rapidly, with clearing skies
Term

The dew point is reached when the...

Select one:

a. Atmospheric pressure is 14.7 lbs. per square inch

b. Temperature of the air equals the temperature of the seawater

c. Air becomes saturated with water vapor

d. Relative humidity reaches 50%

Definition
c. Air becomes saturated with water vapor
Term

A gale is characterized by a wind speed of...

Select one:

a. 64 to 83 knots

b. 10 to 20 knots

c. 34 to 47 knots

d. 48 to 63 knots

Definition
c. 34 to 47 knots
Term

A storm warning is characterized by a wind speed of...

Select one:

a. 64 to 83 knots and not a cycle

b. 10 to 20 knots and not a gale

c. 34 to 47 knots and not a hurricane

d. 47 knots or more and not a cyclone

Definition
d. 47 knots or more and not a cyclone
Term

A boundary between two air masses is a(n)...

Select one:

a. Lapse rate

b. Isobar

c. Front

d. Continent

Definition
c. Front
Term

An isotherm is _____________.

Select one:

a. a line connecting points of equal temperature on a weather map

b. a line connecting equal barometric pressure on a weather map

c. an instrument that measures the climatological effects of temperature

d. a line on a weather map connecting equal points of both temperature and pressure

Definition
a. a line connecting points of equal temperature on a weather map
Term

In the Northern Hemisphere a wind that shifts counterclockwise is a ..........

Select one:

a. Reverse wind

b. Chinook wind

c. Backing wind

d. Veering wind

Definition
c. Backing wind
Term

The "horse latitudes" are regions of ___________________.

Select one:

a. extremely high winds caused by the rotation of the earth

b. Abundant blue sea grass vegetation

c. Light variable winds

d. Brisk prevailing winds

Definition
c. Light variable winds
Term

When cold air displaces warm air you have a(n)...

Select one:

a. Occluded front

b. Cold front

c. Warm front

d. Stationary front

Definition
b. Cold front
Term

Which weather instrument measures atmospheric pressure?

A.  Beaufort scale

B.  Anemometer

C.  Sling spectrometer

D.  Barometer

Definition
D.  Barometer
Term

Which instrument is used to predict the approach of a low-pressure system?

A.  Anemometer

B.  Fathometer

C.  Barometer

D.  Thermometer

Definition
C.  Barometer
Term

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

Definition
D.  All of the above
Term

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

Definition
C.  bring the pointer to its true position
Term

The most important information to be obtained from a barometer is the __________.

 

A. difference between the reading of the two pointers, which shows wind direction

B.  last two figures of the reading of the pointer, 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

Definition
C.  present reading of the pressure, combined with the changes in pressure observed in the recent past
Term

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

Definition
A.  warm front at night
Term

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

Definition
C.  advection fog
Term

A warm air mass is characterized by __________.

A.  stability

B.  instability

C.  gusty winds

D.  good visibility

Definition
A.  stability
Term

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.

Definition
D.  Steady precipitation.
Term

The wind circulation around a high-pressure center in the Northern Hemisphere is __________.

A.  counterclockwise and moving towards the high

B.  counterclockwise and moving outward from the high

C.  clockwise and moving towards the high

D.  clockwise and moving outward from the high

Definition

D.  clockwise and moving outward from the high

Term

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

Definition

C.  counterclockwise and inward

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