Transcript Reading a Weather Map

The
H
stands for a
High Pressure
System
This usually means
CLEAR WEATHER.
The
L
stands for a
Low Pressure
System
This usually means
STORMY weather.

Large areas of air
that have the
same weather,
temperature, and
humidity.

Weather changes
occur as air
masses move and
interact.

A front is the boundary between two
air masses.
Fronts bring changes in the weather.
Because of the wind patterns, they
generally move from west to east in
the US.
Fronts are named for the air that is
behind them.
Cold dense air pushes warm air out of the way.
Cold fronts move very quickly and bring short
periods of rain/thunderstorms.
Lower temperatures are behind the front.
SYMBOL – the direction of the “arrows” points
towards the direction the front is MOVING.
Cold
Front
Awesome Cold Front Time Lapse!
http://www.youtube.com/watch?v=0NoPXm7d5Tc
Warm air moves up the cold front as it slowly displaces
the cold air.
Warm fronts move slowly and can bring many days of
steady precipitation.
Higher temperatures are behind the front.
SYMBOL – direction of semicircles is the direction the
front is moving.
Warm
Front
The air from the warm front and cold front meet,
but do not move.
These fronts have weather similar to warm fronts.
SYMBOL – warm and cold air masses are moving in
opposite directions, thus making a stationary
condition
Where the
warm and
cool air meet,
water vapor in
the warm air
condenses
into rain,
snow, fog, or
clouds.
Stationary Front
Cold Front
Warm Front
http://www.wunderground.com/maps/#?type=Fronts
Weather Map!
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=Fronts