Tropical Cyclones, Hurricanes, and Typhoons

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Tropical Cyclones, Hurricanes, and Typhoons
Winds speeds in excess of 64 knots (74 mph)
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Global sea surface temperatures
T gt 81 oF27 C for hurricane formation
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Warm enough ocean temperatures
large enough Coriolis force
(Latitudes greater than 10 degrees)
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Stages in development
Complexes of thunderstorms
gt64 knots
20-34 knots
35-63 knots
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stages
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Tropical Depressions Initial thunderstorm growth
1. ITCZ
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Warm enough ocean temperatures
large enough Coriolis force
(Latitudes greater than 10 degrees)
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Eye Wall
Rain Bands
Eye
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The pressure in the eye near the surface is very
low and controls the hurricanes strength. The
pressure high above the surface in the eye is
High cause air to sink and clouds to dissappear.
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Surface pressure is lowest in the eye of a
hurricane. Wind speed is maximum in the eye wall
and is usually calm in the eye. Intense rain,
winds, and possibly tornadoes are most likely in
the eye wall.
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Katrina August 28, 2005 TRMM (Tropical Rainfall
Measuring Mission)
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Climatology
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El Nino and Hurricanes
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Are hurricanes getting more frequent or more
intense?
Red-total hurricanes and tropical storms (named
storms) Yellow total hurricanes Green cat 3
or above
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Total power dissipated by hurricanes PDI seems to
be increasing since 1980. From
http//www.pbs.org/wgbh/nova/earth/stronger-hurric
anes.html And http//www.pbs.org/wgbh/nova/scienc
enow/3302/07-hott-nf.html
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Most recent data.