Download Topic 5 Fronts

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FRONTS
Mr. Rocco
Fronts:
boundaries
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(interfaces)
between two different
air masses
cP
mT
Cold front:
advancing
cold
air(cP) meets
retreating warm
air(mT) masses
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THUNDERSTORMS!!!!
Table 7r-1: Weather conditions associated with a cold front.
Weather
Phenome
non
Prior to the Passing of the
Front
Contact with
the Front
After the
Passing of
the Front
Temperat
ure
Warm
Cooling
suddenly
Cold and
getting colder
Atmosph
eric
Pressure
Decreasing steadily
Leveling off then Increasing
increasing
steadily
Winds
South to southeast
Variable and
gusty
West to
northwest
Heavy rain or
snow, hail
sometimes
Showers then
clearing
Cumulus and
cumulonimbus
Cumulus
Precipitati
Showers
on
Clouds
Cirrus and cirrostratus changing
later to cumulus and
cumulonimbus
What causes tornados? - Weather
News - MSNBC.com
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Warm front:
advancing
warm
air(mT)meets retreating
cold air(cP) masses
SHOWERS OUT
AHEAD OF FRONT!
Weather
Prior to the Passing of
Phenome
the Front
non
Contact with
the Front
After the Passing of the
Front
Temperat
Cool
ure
Warming
suddenly
Warmer then leveling off
Atmosph
Decreasing steadily
eric
Pressure
Leveling off
Slight rise followed by a
decrease
Winds
South to southeast
Variable
South to southwest
Precipita
tion
Showers, snow, sleet or
drizzle
Light drizzle
None
Clouds
Cirrus, cirrostratus,
altostratus, nimbostratus,
and then stratus
Stratus,
Clearing with scattered
sometimes
stratus, sometimes scattered
cumulonimbus cumulonimbus
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COLD AND WARM FRONTS
TYPICALLY FORM OUT FROM
LOW PRESSURE CENTERS
LIKE SPOKES ROTATING
COUNTER CLOCKWISE
AROUND A WHEEL
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Occluded front:
faster
cold front catches
up to a part of slower
moving warm front
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Stationary front:
cold
air and warm air
masses do not move for
long period of time
The MidLatitude
Cyclone(NYS)
mP
cP
mT
** triangles/half-circles are
drawn on the side in which air
mass is moving**
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(** SEE ESRT PG. 13**)