Lecture13_120111

Lecture13_120111 - MSC 243 Lecture #13 12/1/11 Tornadoes...

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Unformatted text preview: MSC 243 Lecture #13 12/1/11 Tornadoes Miami: May 12th, 1997 Wind shear (red) sets air spinning (green). The updraft (blue) 'tips' the spinning air upright. The updraft then starts rotating. Enhanced Fujita Tornado Scale (updated February 2007) http://www.spc.noaa.gov/efscale/ OPERATIONAL EF SCALE EF Number 3 Second Gust (mph) 65-85 1 86-110 2 111-135 3 136-165 4 166-200 5 Over 200 The Enhanced F-scale is a set of wind estimates (not measurements) based on damage. Its uses three-second gusts estimated at the point of damage based on a judgment of 8 levels of damage to 28 indicators. The 3 second gust is not the same wind as in standard surface observations. Standard measurements are taken by weather stations in open exposures, using a directly measured, "one minute mile" speed. National Weather Center, OK http://www.spc.noaa.gov/ Storm Prediction Center Tornado Watches and Warnings Nobody knows for certain how tornadoes form, but they do know when conditions are most likely for them to form. When the conditions are conducive, the Storm Prediction Center issues a tornado watch . (lasting 4-6 hours) When a tornado watch is issued, local storm spotter networks activate. If a spotter sees a funnel cloud or tornado, the local Weather Service office will issue a tornado warning . They can also issue warnings based on radar ....
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Lecture13_120111 - MSC 243 Lecture #13 12/1/11 Tornadoes...

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