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WEATHER. AIR MASS. huge mass of air with similar temperature and humidity characteristics. huge section of the troposphere in which the temperature and humidity are fairly uniform at any given level. name an air mass from its temperature and humidity. SOURCE REGION.

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WEATHER

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WEATHER


AIR MASS

huge mass of air with similartemperature and humidity characteristics

huge section of the troposphere in which the temperature and humidity are fairly uniform at any given level

name an air mass from itstemperature and humidity


SOURCE REGION

location over which an air mass sitsand acquires itstemperature and humiditycharacteristics


two broad types of surfaces on earth:

waterland

the humidity characteristic of an air mass comes from the type of surface of the source region

water = moist

land = dry

maritime

continental

m

c


temperature comes from latitude of the source region

equatorialEhot

tropicalTwarm

polarPcool or cold

arcticAvery coldantarcticAA


humiditytemperature

m, cE, T, P, A

mEcE

mTcT

mPcP

mAcA

6

8

NAME AN AIR MASS=one of these six choices


AIR MASS SOURCE REGIONSNorth America

cP-cA

mP

mP

cP

mT

cT

mT

mT


the characteristics of an air mass dominate the weather of locations within the air mass

cE--hot and dry

cT--warm and drymT--warm and moist

cP--cool or cold and drymP--cool or cold and moist

cA--very cold and dry

air mass weather--dominated by an air mass


air masses move away from their source regions

FRONT

boundary between two different air masses


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 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


cold air

cold front

cold air

warm front

warm air

warm air

cold air

stationary front

warm air

occluded front

weather map symbols

N


Cross-Section of a Warm Front


cumulonimbus

cold air

warm air

Cross-Section of a Cold Front


Cross-Section of a Stationary Front


polar front begins as a stationary front


the polar northeasterlies begin to push the air mass southward, and the prevailing southwesterlies begin to push an air mass northward


stationary front

polar front

L

cold

warm

L

cold

warm


L

L

cold

cold

warm

warm

repeated illustration

for comparison


Middle Latitude Cyclone


polar front

L

cold

warm

L

L

cold

cold

warm

warm

Middle Latitude Cyclone


L

cold

warm

OCCLUDED FRONT

map view

cross-section

cold air

cool air

surface

cold-front type occlusion


L

cumulonimbus

cold

cold air

warm

MAP VIEW

Cross-Section of Middle Latitude Cyclone with center of the low to the north


cold air

cumulonimbus

The Process of OCCLUSION


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