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Storms
Tornado
Thunderstorms
Hurricanes
Cyclone vs. Anti-cyclone
• Cyclone
• Low Pressure
• Counter Clockwise
winds
• Storms/ precipitation
•
•
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•
Anti-cyclone
High Pressure
Clockwise winds
Dry clear weather
Tornadoes
•
•
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Low pressure
Form in Cumulonimbus clouds
Spring and summer
Late afternoon when the ground is warm
Warm humid air mass– meets--- a cool dry
air mass
• * rapidly whirling, funnel shaped cloud that
reaches the ground from a storm cloud
Tornado Alley
•
•
•
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North-Central Texas
Kansas
Nebraska
Oklahoma
*BUT can happen anywhere
Thunderstorms
• Form inside Cumulonimbus clouds
• Warm air is forced upward at a Cold Front
• Produce: heavy rain, thunder, lightning,
and sometimes hail
Thunder
• When lightning heats the sky to 30,000ºC
• The lightning creates a loud explosion
• Light travels faster than sound, explaining
why the lighting occurs before the thunder
Lightning
• A sudden spark, or energy discharge, as
electricity charges jump between parts of a
cloud, or between the cloud to the ground.
Hurricanes
•
•
•
•
•
Form over warm tropical oceans
Winds at least 75 mph
Eye- calm center of hurricane
Weakens over land
The lower the pressure, the stronger the
storm
• Barrier islands protect the coast by
weakening the hurricane
Storm Surge
• A dome or wave of water that sweeps
across the coast onto the land where a
hurricane lands.
• This causes flooding and possible water
damage
• Wind and storm surges cause most of the
damage