Download Source Region: location in which the air mass forms and develops

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Transcript 
Air Masses (see page 13 in ESRT)
Air Mass: a large (>1000 Km2) body of air with uniform properties of
temperature and moisture.
Source Region: location in which the air mass forms and develops
its primary characteristics.
Source Region
Regional Moisture Abbreviation
(lower case)
Characteristics
Temperature
Characteristics
Abbreviation
(upper case)
Symbol
Central
Canada
Continental (Dry)
c
Polar (Cold)
P
cP
Gulf of
Mexico/
Florida
Maritime (Moist)
m
Tropical (Warm)
T
mT
Southwest
USA
Continental (Dry)
c
Tropical (Warm)
T
cT
Pacific
Northwest
Maritime (Moist)
m
Polar (Cold)
P
mP
Atlantic
Northeast
Maritime (Moist)
m
Polar (Cold)
P
mP
Far Northern
Canada
Arctic Continental
(Very Dry)
c
Arctic (Very Cold)
(winter only)
A
cA
Air Mass source regions and their movement across the country
cA Canada
cP
mP
mP
cT
mT
Mexico
mT
When air masses meet a transition takes place and
violent weather can sometimes occur.
cnPenta
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a
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o
P
l
ti
n
Co
l
a
T
c
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T
ime
it
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A zone of transition between air masses with differing
characteristics is where a WEATHER FRONT will form.
Page 13 ESRT
The Cold Front
The Cold Front – transition zone between a warm air mass
And a colder air mass.
Draw a line where a transition between an advancing cold air mass and a
warmer air mass is taking place.
Surface weather conditions during a cold frontal passage.
passage
Surface
Conditions
Winds
Temperature
Pressure
Precipitation
Visibility
Dew Point
Before Passing
While Passing
After Passing
The COLD FRONT
Warm Moist Air
Cold air mass will displace a warmer air mass upwards.
Warm air rises ahead of the front.
Causes heavy rain just ahead of the front,
thunderstorms, hail, tornadoes, and
rapidly decreasing temperatures.
The Warm Front
The Warm Front – transition zone between a warm air mass
And a cooler air mass.
Draw a line where a transition between an advancing warm air mass and a
cooler air mass is taking place.
Surface weather conditions during a warm frontal passage.
passage
Surface
Conditions
Winds
Temperature
Pressure
Precipitation
Visibility
Dew Point
Before Passing
While Passing
After Passing
The WARM FRONT
ss
a
M
ir
A
m
r
a
W
Warm air will rise up the back end of a slower moving cooler air mass.
Warm air rises, cools, condenses,
Causes extended periods of rain,
Slowly increasing temperatures.
Other Frontal Boundaries
Extended period of clouds and precipitation
Cold
Air Mass
Warm
Air Mass
Stationary Front
Other Frontal Boundaries
The Occluded Front
Occluded Front
Warm Air Mass
Warm air will rise up the back end of a slower moving cooler air mass.
Warm air rises, cools, condenses,
Causes extended periods of rain,
http://weather.cod.edu/sirvatka/fronts.html
http://www.ametsoc.org/amsedu/dstreme/index.html
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/ofdef.rxml
http://www.mhhe.com/earthsci/geology/mcconnell/wea/front.htm
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