weather
Post on 31-Dec-2015
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AIR MASSAIR MASS
huge mass of air with similartemperature and humidity characteristics
name an air mass from itstemperature and humidity
huge section of the troposphere in which the temperature and humidity are fairly uniform at any given level
SOURCE REGIONSOURCE REGION
location over which an air mass sitsand acquires its
temperature and humiditycharacteristics
the humidity characteristic of an air mass comes from the type of surface of the
source region
two broad types of surfaces on earth:
waterland
land = drywater = moist
maritime continentalm c
temperature comes from latitude of the source region
equatorial E hot
tropical T warm
polar P cool or cold
arctic A very coldantarctic AA
humidity temperature
m, c E, T, P, A
mE cE
mT cT
mP cP
mA cA
8 6
NAME AN AIR MASS=one of these six choices
the characteristics of an air mass dominate the weather of locations within the air mass
cE--hot and dry
cT--warm and dry mT--warm and moist
cP--cool or cold and dry mP--cool or cold and moist
cA--very cold and dry
air mass weather--dominated by an air mass
the earth’s rotation makes a frontal boundary surface a gentle slope
warm air is less dense than cold, so the warm air rises over the colder, denser air
4 TYPES OF FRONTS4 TYPES OF FRONTS
warm front--warm air moves in to replace cold
cold front--cold air moves in to replace warm
stationary front--boundary between two different air masses which is not moving appreciably
occluded front--more complex, to be defined later
weather map symbolsweather map symbolsN
cold front
cold air
warm air
stationary front
cold air
warm air
warm front
cold air
warm air
occluded front
the polar northeasterlies begin to push the air mass southward, and the prevailing
southwesterlies begin to push an air mass northward
cold
warm
L
OCCLUDED FRONT
cold air cool air
map view
cross-section
surfacecold-front type occlusion
cold
warm
L
cumulonimbus
cold air
Cross-Section of Middle Latitude
Cyclone with center of the low to the north
MAP VIEW
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