Meteorology 8
All of the following accompany a classic New England nor'eastern EXCEPT
A strong storm forming in Canada and moving into New England from the north
Where do cA air-masses originate?
Arctic basin and Greenland ice cap
Which of the following is not a good source region for an air masses
Central United States
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
Lines connecting places having equal rainfall on a map
Isohyets
While on vacation in florida, you experience several days of weather with maximum temperatures of 90 degrees and dew points about 65 degrees. What educated guess could you make?
It is caused by an mT air mass
The two most important properties that should be relatively homogeneous at the same altitude in an air mass are
Moisture context and temperature
An mT air mass moving onto land in the southeastern United States during the summer time
More stable
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 string jet stream pulling on 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.
An air mass is a body of air that
Similar values of temperature and moisture at any given altitude
Air masses with cA and cP designations are typically:
Stable
Most mP air masses that influence the U.S. originate over:
The North Pacific
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.
Which of the following criteria is not a characteristic of a good source region
The area must frequently experience cyclones
Why is maritime attic left out of an 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
The coldest and driest winter air-mass in North America is the
cA
Which air mass does not usually influence weather in the US during the summer
cA
Which of the following air masses probably has the lowest water vapor content
cA
"Lake effect" snow is associated with the ___ air mass
cP
The pronounced cooking 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 US
cT
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
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
Which of the following is not an air mass that influences North America
mA
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
Consider the map above. What air mass is the most likely to be found in florida, just ahead of the cold front
mT
Why air mass contributes to the formation of thunderstorms in the central US
mT
An air mass from the Gulf of Mexico is called
mT (maritime tropical)
A warm, moist air mass from the Gulf of Mexico that moves over the land in the southeastern US 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 stability of an air mass can be affected by
mountain ranges, cyclones, and anticyclones
An ideal source region of air masses should be:
physically uniform
Air mass source regions tend to be dominated by:
slow moving anticyclones
The area where an air mass originates is called a:
source region
Which air mass code letter is paired with the wrong word
t = temperate
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
Where would you expect to find the greatest amount of lake effect snowfall
the leeward shores of the Great Lakes
Characteristics of an air mass source region include
uniformity of temperature and moisture
