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Warm Up Chapter 20

Warm Up Chapter 20. What kind of temperature or weather are the following fronts going to bring? Cold front Warm front Occluded front Stationary front Draw the symbols for the following fronts. Cold front Warm front Occluded front Stationary front.

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Warm Up Chapter 20

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  1. Warm Up Chapter 20 • What kind of temperature or weather are the following fronts going to bring? • Cold front • Warm front • Occluded front • Stationary front • Draw the symbols for the following fronts. • Cold front • Warm front • Occluded front • Stationary front

  2. 20.3: Thunderstorms and Tornadoes • Section 20.3 - Agenda • Thunderstorms • - Lightning • Tornadoes • Formation • Effects • Predicting • Watches and Warnings

  3. Thunderstorms • Form in warm, moist, unstable air • These conditions form cumulonimbus clouds • Consist of one or more Cells vis2004

  4. Thunderstorm Life Cycle 1. Cumulus stage – Moist warm air rises forming a cumulus cloud. The rising air is called an updraft. And updraft prevents precipitation from reaching the ground. vis2004

  5. Thunderstorm Life Cycle 2. Mature stage – The precipitation becomes heavy enough to fall through the updraft and reach the ground. The falling precipitation creates a downdraft. vis2004

  6. Thunderstorm Life Cycle 3.Dissipating stage – The downdraft weakens the updraft, eventually cutting off the supply of moist air rising into the cloud. The cloud begins to evaporate. vis2004

  7. Thunderstorm Locations • Often form along fronts where warm air meets cold dry air and then rises. • Supercells are very strong single-cell thunderstorms.

  8. End…

  9. Squall Lines are lines of storms hundreds of miles long

  10. Lightning • Huge discharge of electricity

  11. Heats the air to more than 25,000 degrees Celcius. • Causes air to expand rapidly = thunder • Since light travels much faster than sound, you see lightning first, hear thunder later

  12. Between Clouds Lightning Strikes

  13. Cloud to Ground

  14. Tornadoes • Violently rotating column • ofair • Usually touches the ground • Forms when a thunderstorm has an updraft called a mesocyclone vis2006

  15. Tornadoes • Damage path can be a 100 feet, up to 1 mile wide • Measured with “Fujita” • scale • Predicted and tracked • using Doppler Radar

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