Tropical Cyclones, Hurricanes, and Typhoons Winds speeds in excess of 64 knots (74 mph)

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Presentation transcript:

Tropical Cyclones, Hurricanes, and Typhoons Winds speeds in excess of 64 knots (74 mph)

Global sea surface temperatures T > 81 o F=27 °C for hurricane formation

Warm enough ocean temperatures & large enough Coriolis force (Latitudes greater than 10 degrees)

Stages in development knots >64 knots knots Complexes of thunderstorms

stages

Tropical Depressions Initial thunderstorm growth 1. ITCZ

Warm enough ocean temperatures & large enough Coriolis force (Latitudes greater than 10 degrees)

Eye Eye Wall Rain Bands

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.

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.

Katrina August 28, 2005 TRMM (Tropical Rainfall Measuring Mission)

Climatology

El Nino and Hurricanes

Red-total hurricanes and tropical storms (named storms) Yellow : total hurricanes Green : cat 3 or above Are hurricanes getting more frequent or more intense?

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Most recent data.