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Fronts
Fronts &
Weather Cells
How the weather
changes and what do
C.O.W.S. have to do
with the weather?
•
•
Fronts:
The boundaries between
air masses
•Fronts are a boundary
between air masses
with different
humidity.
Fronts:
Boundaries between air masses
• Fronts are a boundary
between air masses with
different humidity.
• Usually caused by
temperature differences.
Fronts:
Boundaries between air masses
• Fronts are a boundary
between air masses with
different humidity.
• Usually caused by
temperature differences.
Different types of fronts
• Cold Fronts
• Occluded Fronts
• Warm Fronts
• Stationary Fronts
Cold Front
• A cold front
is when
cold air
replaces
the warmer
air.
Cold Front
• A cold front
has warm
temperatures
on one side
and colder on
the other
side.
Cold Front
• The cold
front symbol
is blue teeth
pointing in
the direction
of travel into
the warmer
air.
Cold Front
• The cold front
symbol is blue
teeth pointing in
the direction of
travel into the
warmer air.
• Draw this
symbol on
your paper.
Cold Front View
• When cold air
advances,
• warm air is
pushed up
creating a
cumulonimbus
cloud. (cn)
Cold Front
When a cold
front arrives
the
barometric
pressure will
increase and
remain high.
Cold Front
Cold Front
• A. continental Polar (cP)
or continental Arctic Air
(cA) Mass from the North
• Winds in front of the front
from the West.
Cold Front
• B. Maritime Polar (mP)
air from the Pacific
Ocean
• Winds in front of the
front from the South.
Cold Front
Cold Front
• The wind in front
of the cold front
will tend to be
from the west or
at a 90° (degree)
angle to the
advancing cold
air.
Cold Front
• The cold air
comes from
the north,
whereas the
warm air
comes from
the south.*
Record Change in Temperature
• 100 F change
• From 44 to -56 in 24 hours
• Jan 23-24, 1916
• Browning Montana
Occluded Front Develops
• A cold
occlusion
occurs when
the air behind
the front is
colder than
the air in front.
Occluded Front Develops
• This produces
conditions like
a cold front with
thunderstorms
and severe
weather.
• This area
produces a lot
of rain or snow.
Warm Occlusion
•Cold air behind cold
front is not dense
enough to lift cold air
ahead of warm front.
Warm Occlusion
Warm Occlusion
•A warm occlusion
occurs when the air
behind and above
the front is warmer
than the air ahead of
the front.
Warm Occlusion
•It produces weather
similar to a warm
front, with long
periods of rain.
Air types around a Low
• The warm moist
air is a maritime
tropical air
mass (mT).
• The cold dry air
is continental
polar air mass
(cP).
Occluded fronts can signal
weakening of storm
Warm Fronts
• A warm front
is when
warm air
advances
and replaces
colder air.
Warm Fronts
• Draw the
symbol for
a warm
front.
• State its
color and
color it
correctly.
Warm Fronts
• Warm air is
lighter and
more humid
and less dense
than the cold
air and it has
lower
pressure.
Record Change in Temperature
• 53 F change
• From -4 F to 49 F in 2hours
• Jan 22, 1943
• Spearfish South Dakota
Fronts: True or False
• Warm fronts that have
been slowed down by
stubborn cold air may
lead to several days of
wet weather.
Stationary Fronts
Stationary Fronts
When the pushing
between two air masses
results in a standoff, the
boundary is known as a
stationary front.
Stationary Fronts
• When the
position of the
front stays in
one place for a
while it is called
a stationary
front.
Stationary Fronts
They can bring several
days of cloudy, wet,
weather that can last a
week or more.
Stationary Front
• Symbols
include the
cold and warm
front symbols
but on the
opposite
sides.