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Severe Storms. Thunderstorms. Occur in warm, moist air masses and along fronts. Sinking rain, cooled air, and strong updrafts of warm air cause strong winds. If winds reach 89 km/h or faster, it is a severe thunderstorm. Flash floods, strong winds, hail. Thunderstorms. Lightning.

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Presentation Transcript
thunderstorms
Thunderstorms
  • Occur in warm, moist air masses and along fronts.
  • Sinking rain, cooled air, and strong updrafts of warm air cause strong winds.
  • If winds reach 89 km/h or faster, it is a severe thunderstorm.
  • Flash floods, strong winds, hail.
lightning
Lightning
  • In a storm cloud, warm air is lifted rapidly as cooler air sinks. This movement causes different parts of the cloud to become oppositely charged.
  • When the current flows between opposite charges, lightning flashes.
  • Occurs in 3 places: within a cloud, between clouds, cloud and the ground.
thunder
Thunder
  • Results from rapid heating of air around lightning. (Lightning is 30,000 degrees celsius.. 5x the surface of the sun!!)
  • The extreme heat causes air around the lightning to expand rapidly. Then it cools and contracts.
  • The rapid movement of moleculesforms sound waves heard as thunder.
tornadoes
Tornadoes
  • A violently rotating column of air in contact with the ground.
  • In severe thunderstorms, wind at different levels blow at different direction and speed. This is called wind shear.
  • Rips apart building, uproot trees, blow through glass. Can lift animals, cars and houses in the air.
hurricanes
Hurricanes
  • Large, swirling, low pressure system that forms over the Atlantic Ocean.
  • Must have winds of at least 119 km/h.
  • Category 1-5 (250 km/h)
  • Typhoon- forms over the Pacific Ocean.
  • Cyclones- Form over the Indian Ocean.
strongest hurricanes
Strongest Hurricanes
  • Begin as low pressure systems west of Africa.
  • Steered by surface winds.
  • travel west.
  • Gains strength from heat + moisture of warm ocean water.
  • When it hits land, it loses power and dumps water.
  • Strongest winds are within 80 km of the eye. (50 miles)
blizzards
Blizzards
  • Winds at 56 km/h
  • Blowing snow
  • Visibility less than 400m
  • These conditions must persist for 3 hours or more.
national weather service
National Weather Service
  • watch- conditions

are favorable

  • warning-

weather exist,

take cover!