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WEATHER
FRONTS
And Severe weather
WEATHER • Boundary between
two air masses
FRONT
• Storms and
precipitation form at
these fronts
• When fronts collide,
air moves from high
to low pressure areas
WARM FRONT
• When a warm air mass
moves over cool air masses
• Slowly slides over the cool
air
• Gradually forces warm air
higher to form clouds and/or
precipitation
COLD FRONT
• Cold air mass quickly
pushes under warm air
• Forces warm air up
quickly
• Bring stormy weather
– Thunderstorms
– Tornados
OCCLUDED
FRONT
• Two cool air masses joining
together
• Forces the warm air between
them to rise
• Causes strong winds and
heavy precipitation
STATIONARY
FRONT
• When pressure
differences cause fronts
to stop moving
• May remain in place for
several days
• Brings light wind and
precipitation
THUNDERSTORMS
• Occurs in warm moist air masses
where warm air rises rapidly
• Forms cumulonimbus clouds
• Usually heavy rain and/or hail
• Lightning and thunder
HEAVY RAIN
• Formed in cumulonimbus
clouds
• Precipitation drops fall
great distances and collide
into each other
• Falling drops drag air
downward creating strong
winds
LIGHTNING
• Rapid movement of air creates
electrically charged particles in
the air
• Charge is released as electrical
energy (lightning)
• Can happen cloud to cloud or
cloud to earth
THUNDER
• Caused by the rapid heating and
contracting of air around lightning
strikes
• Extreme heat causes air to expand
fast then cool fast contracting inward
• Contracting air creates sound waves
• Cannot occur without lightning
TORNADO
• Violent swirling wind that moves in a
narrow path over the land
• Usually forms along a cold front
• Caused by the strong winds
generated by heavy rains in
thunderstorms
– Different wind speeds
– Different wind heights
– Different wind directions
• Classifications based on wind speeds
and damage caused
HURRICANE
• A large swirling low pressure
system that forms over
tropical oceans
• Low pressure sucks in warm
air that rises
• Warm moist air swirls around
cooler air at the center
• As air rises it cools and
condenses
• Bring fast winds, heavy rains,
and ocean storm surges
• Also called cyclone, typhoon,
or tropical storm