Met. Ch 8 test review
Where do CA air-masses originate?
Arctic basin and Greenland ice cap
Which of the following air masses probably has the lowest water vapor content?
CA
The coldest and driest winter air-mass in North America is the:
CA.
While on vacation in Florida, you experience several days of weather with maximum temperatures of 90°F and dew points above 65°F. What educated guess could you make about the weather?
It is caused by an mT air mass.
Which of the following criteria is a characteristic of a good source region?
It must be very large. It must have uniform physical features. The air must able to stagnate over the area for long periods of time.
A nor'easter typically occurs when:
NE winds associated with a low-pressure system draw mP air into the northeastern United States.
The is characterized by a strong jet stream pulling mT air from Hawaii towards California.
Pineapple Express
Why are maritime air masses from the north Atlantic of only limited concern for weather in the U.S.?
Prevailing winds move them away from the U.S.
What term would a meteorologist give to the weather event represented on the map above?
The Siberian Express
What does the lowercase letter w indicate about an air mass?
The air mass is warmer than the surface over which it is passing.
Why is Maritime Arctic left out of the air-mass classifications?
They only rarely occur.
When an area is experiencing several consecutive days of rather constant weather, it is experiencing:
air-mass weather.
The usual size of an air mass is:
at least 1600 km across.
"Lake-effect" snow is associated with the
cP
The pronounced cooling that occurs on continents at high latitudes during winter leads to the formation of __________ air masses.
cP
In North America the air mass forms only in the summer.
cT
Which air mass causes occasional drought to the southern Great Plains of the United States?
cT
An air mass is often modified as it moves over the earth's surface. This modification is largely due to:
contact with the new surface below.
The typical amount of time it takes for an air mass to pass over a given area is on the order of a few:
days.
Compared to continental air masses with the same air temperature, maritime air masses:
have higher water vapor content.
An mP air mass is:
humid and cold.
An air-mass source region:
is characterized by a general stagnation of atmospheric circulation.
Lines connecting places having equal rainfall on a map are called:
isohyets.
An air mass moves out of its source region. Two days later, the lower layers of the air mass are found to be warmer than they were originally. What letter should be added to the end of the air mass's classification code?
k
The air mass may produce an occasional "nor'easter" in the winter.
mP
Which air mass is unstable in the winter but stable in the summer?
mP
Which air mass usually influence weather in the United States during the summer?
mP cP cT
Which of the following is an air mass that influences North America?
mP mT cP CA
Consider the map above. What air mass is the most likely to be found in Florida, just ahead of the cold front?
mT
What air-mass contributes to the formation of thunderstorms in the central U.S.?
mT
An air mass from the Gulf of Mexico is called:
mT.
A warm, moist air mass from the Gulf of Mexico that moves over the land in the southeastern U.S. during the summer is likely to be classified as:
mTk.
Air masses passing from the Gulf of Mexico over land in the Southeastern United States in the summertime are modified by the hot surface and become:
mTk.
An air mass from the Gulf of Mexico that moves northward over the U.S. in winter would be labeled:
mTw.
The two most important properties that should be relatively homogeneous at the same altitude in an air mass are:
moisture content and temperature.
An mT air mass moving onto land in the Southeastern United States during the summer time typically becomes:
more unstable.
The stability of an air mass can be affected by:
mountain ranges, cyclones, and anticyclones.
Where would you expect to find the greatest amount of lake-effect snowfall?
on the leeward shores of the Great Lakes
An ideal source region of air masses should be:
physically uniform.
An air mass is a body of air with:
similar values of temperature and moisture at any given altitude.
Air mass source regions tend to be dominated by:
slow moving anticyclones.
The area where an air mass originates is called as
source region.
Air masses with cA and cP designations are typically:
stable.
Which air mass code letter is paired with the wrong word?
t= temperate
Which of the following is a good source region for air masses?
the North Pacific central Canada the Gulf of Mexico
When an air mass is warmer than the surface over which it is moving:
the air becomes more stable.
In the United States, lake-effect snows occur over which area?
the leeward shores of the Great Lakes
Most mP air masses that influence the U.S. originate over:
the north Pacific.
Characteristics of an air mass source region include:
uniformity of temperature and moisture.
All of the following accompany a classic New England nor'easter
widespread power outages and transportation interruptions. heavy snowfall. mP air pulled in from the Atlantic Ocean.
