Hurricane structure why do hurricanes have eyes 2

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Hurricane Structure: Why Do Hurricanes Have Eyes? 2 Reasons: 1. Air descends in the eye.  The extremely low pressure at the surface in the center allows gravity to slowly pull the air down 2. Descending air warms  promotes evaporation  descending air clears the sky!
First Law of Thermodynamics = 10˚C/km cooling rate as air ascends, warming rate as it descends. Assume the hurricane is 20 km tall If the air descends in the eye from the top of the hurricane all the way to the sea surface, it will cover 20 km. It will also compressionally warm the entire trip. 20 km * 10˚C/km = ??? (Air cannot descend from the tropopause all the way to the surface!) Hurricane Eyes Are Warm…
@ 10,000 ft AGL it was over 90F in the eye of Patricia The tops of these storms were -130F Hurricane Patricia (2015)
Hurricane Patricia (2015)
Pressure Winds Rainfall Temperature Storm Surge Eye Eye wa l l Spiral Rainbands E yewa ll Spiral Rainbands Strongest pressure gradient Lowest pressure in the center of the eye Fastest winds on the right hand side Calm winds in the center where there is no pressure gradient Rains fall under each rainband and the eyewall. Become more intense toward the center Hurricanes have a warm core. Storm surge is greatest on the right hand side Tropical Cyclone Structure: Vertical Cross Section
Ingredients Conducive for Development: #1 Sea Surface Temperature 80°F (26.5°C) Measured with IR satellites and buoys The maximum potential strength of a hurricane is directly related to the SST Weather modification… Cold water trail from Jose and Maria Cold water trail from Jose and Maria
Ingredients Conducive for Development: #2 Deep (200 feet) layer of warm water

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