Class 5a: Weather and storms

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Class 5a Weather and storms
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Hurricanes

• Start at low pressure centers
• Steep pressure gradient ? strong winds (74 mph)

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Hurricanes
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Hurricanes
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Hurricanes
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Hurricanes

• Damage from high winds, rain
• Most deaths from flooding

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Midlatitude weather air masses
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Air masses

• cP (continental polar)
• mP (maritime polar)

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Air masses

• mT (maritime tropical)

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Fronts
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Warm fronts

• Warm air advances over cold

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Cold fronts

• Cold air plows under warm air

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Midlatitude cyclonic systems

• Main midlatitude storm system

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Midlatitude cyclonic systems

• Cyclogenesis
• Open stage

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Midlatitude cyclonic systems

• Occluded
• Dissolving

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Thunderstorms

• Violent, convective storm

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Thunderstorms

• Hail caused by updrafts layers of ice
• Lightning caused by electrical separation

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Thunderstorms

• Where? High temperatures, humidity, and
  instability

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Tornadoes

• Most violent atmospheric disturbance

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Tornadoes

• Most common in North America