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17 Cards in this Set

  • Front
  • Back
Hurricanes--General Names
US: Hurricane
Indian ocean: Cyclone
West Pacific: Typhoon
Convection upwelling if it were dry
T drops as air rises to lower pressure and gas expands
Convection upwelling--if it is humid (hurricane)
Temperature drops because of lowering pressure; reaches condensation temperature; water vapor condenses, large latent heat release; heats air and causes upswelling; draws in more moist air faster, which goes through the same process faster <-- positive feedback
With Coriolis Effect, flow into low pressure zones are
clockwise or "cyclonic"
With Coriolis Effect, flow into high pressure zones are
Clockwise or "anticyclonic"
What is the formation of a hurricane?
They form in the warm tropics (low lattitudes) as warm upswellings and pressure lows; Moist air spirals in (Coriolis effect) to pressure lows; Condensation and latent heat release boost upswelling, and thus draw air in faster: crucial feedback
What are the stages of development of a hurricane?
Tropical disturbance
Tropical depression
Tropical storm
Tropical cyclone (hurricane)
What is a tropical disturbance?
Low pressure zone associated with warm upswelling; no identifying number or name
What is a tropical depression?
Increased windspeed leads to a tropical depression; gets identifing number (and sometimes a name)
What is a tropical storm?
Sustained wind speeds exceed 39mph but is still less than 74mph; receives an identifying name
What is a tropical cyclone?
Sustained wind speed exceeds 74mph; "eye" develops
Saffir-Simpson Scale
Category 1: 74-95mph winds
Category 2: 96-110mph winds
Category 3: 111-130mph winds
Category 4: 131-155mph winds
Category 5: >156mph winds
What is a hurricane path?
First westward direction is determined by trade winds. Once deflected north or South, it turns to the East because of the Coriolis effect and then follow mid-lat westerlies.
When do hurricanes die out?
When they go over dry land or into cold ocean.
How does NOAA forecast hurricanes?
Multi-year or multi-decade cycles
Cause of most hurricane deaths are from
Storm Surges
Storm Surges occur when
Low pressure at the center of a hurricane lifts up water above sea level, and the water runs on the shore and floods inland