Hurricanes and Tornadoes

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Tornados vs. Hurricanes

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Presentation transcript:

Hurricanes and Tornadoes See video “Twister”

What Do Hurricanes and Tornadoes have in Common? Low Pressure Latent Heat of Condensation Strong Winds Hazardous to Life and Property

How Do They Differ? Location Size Duration Season of Occurrence Distinctive Hazards

When Do They Occur? Hurricane season? Late Summer and Fall Tornado season? Spring and Early Summer

Location – Where Do Storms Form? Hurricanes form over warm (27* C) tropical seas or higher Latitude 7-15 degrees N and S of the equator Tornadoes form over land in mid latitudes

See “Hurricanes 101 video”

Tracks of Hurricanes Hurricanes die out over land Why? Friction and loss of moist air from ocean

Size and Duration of Hurricanes Hurricanes typically 600 km wide Last 10-14 days Rate of travel approximately 10 km/h Travel with Trade Winds

Hurricane Structure Intense low pressure system Over 120 km/h winds Strong convectional lifting Eye with calm, clear conditions

Hurricane Structure Air cools off quickly the higher you go Wind must be blowing in the same direction and at the same speed to force air upwards from ocean’s surface Winds flow outward above the storm, allowing the air below to rise The Coriolis force is needed to to create the spin in the hurric

Hurricane Damage High winds 120-200 km/h Torrential rains Flash floods Storm surges as sea level rises See video “Hurricane Katrina day by day”

Storm Surge -Storm surge is a rise of water levels as a result of the hurricane (they bring a lot of precipitation with them)

Storm Surge

Hurricane Video See videos “Hurricane Sandy: A once in a generation storm” & “Hurricane Sandy: Cruise ship”

Tornado Video See Video “Tornadoes 101”

Formation of Tornadoes Warm moist air flows into a storm and gets twisted by upper level winds This rotating column of air gathers force and produces a tornado

Location of Tornadoes Most common in the United States Plains States, Midwest, and Florida In advance of a cold front Embedded in hurricanes Narrow intense storm 1/2 km wide path of 6 miles SW to NW A few minutes to three hours

Structure of a Tornado Cumulonimbus cloud A narrow funnel A dust cloud

Size and Duration of Tornadoes Narrow intense storm 1/2 km wide path of 10 km SW to NW A few minutes to three hours

Tornado Hazards Wind Speed 150-450 km/h Strong updraft in the funnel Explosions due to pressure contrast

Review Which is larger, a hurricane or a tornado? Which moves faster, a hurricane or a tornado? Which lasts longer? Where do hurricanes form? Where do tornadoes form?