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Severe Weather.

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Presentation on theme: "Severe Weather."— Presentation transcript:

1 Severe Weather

2 Thunderstorms Three Causes: Air Mass Thunderstorms
Abundant moisture in lower layers of atmosphere Mechanism to lift air, allowing condensation Unstable air mass Air Mass Thunderstorms Unequal heating within 1 air mass Occur midday, last ~ ½ hour Frontal Thunderstorms Caused by cold front

3 Lightning Lightning occurs when there is a charge separation in the cloud. As a thunderstorm grows, electrical charges build up within the cloud, with positive charges at the top, and negative charges at the bottom. Oppositely charged particles gather at the ground below the cloud.

4 Tornadoes A tornado is a violent, whirling column of air in contact with the ground. Come from supercells – most intense thunderstorms Most tornadoes form in the central and southern United States Continental polar air collides with maritime tropical air from Gulf of Mexico

5 How are Tornadoes Measured?

6 Hurricanes Hurricanes are large, rotating, low-pressure, storms
Form from energy in warm, tropical oceans Air rises due to existing disturbance and low-pressure system is formed What causes rotation? Coriolis effect Hurricane Season is from June to November



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