Chapter15a - Hurricanes Tropical Weather

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Hurricanes
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Tropical Weather Tropics : the belt between the  Tropic of Cancer  (23.5N) and the  Tropic of Capricorn  (23.5S) The weather is very different from that of the mid-latitudes  Temperature: small seasonal changes (the noon sun is always high) Precipitation: either wet all seasons (Af) or distinct dry and rainy seasons (Aw, Am)  depending on the location of the ITCZ Winds: mostly easterlies The  surface temperature of the ocean  is relatively high all year around resulting is high  evaporation rate and water content in the atmosphere. In the NH the ocean temperature is maximum  August-September . This is the time when large  amount of  latent heat  is released in the atmosphere.
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Satellite Infrared Image
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Tropical Waves Streamlines : depict actual wind flow at the  surface (account for friction as well). Exhibit  regions of surface convergence and divergence Tropical wave : a weak trough of low pressure  disturbing the streamlines Tropical waves have wavelengths ~2500 km, move  slowly to the west. In the zone of  divergence : West  side of the trough Downward  air motion Fair  weather In the zone of  convergence : East  side of the trough Upward  air motion Precipitation  and storms Occasionally the tropical wave will intensify and  become a hurricane
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Hurricanes hurricane  is a tropical cyclone with sustained winds over 74 mi/hr (64 knots), formed over 
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Chapter15a - Hurricanes Tropical Weather

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