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General Discussion >> Hurricane Ask/Tell
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dem05
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Posts: 368
Loc: Port Charlotte, FL
Re: HurriScale
      Mon Jul 23 2007 05:08 AM

This is good info for the weather hobbiest's back pocket. I would like to indicate two things that should be remembered when using this though...

As Danial Pointed Out, the "clock starts ticking" in his formula when the storm reaches 75MPH. This is very important for a best estimate. For example, Wilma did not become a hurricane until she reached a pressure of about 977 mb. This low pressure was a function of the overall surrounding environment, which also had a very low pressure. The lowest pressure for Wilma was around 882 mb. If you initialized Wilma as a hurricane at 1000MB (Wich is not correct, remember it was 977mb), you would get a wind speed of roughly 193 mph. When initiallizing at 977mb, which is the correct pressure, the wind speed would 170mph...which is pretty close to the actual maximum sustained winds (which were around 175mph).

Also important to remember is that this is an estimate, not a perfect science. In addition, the equation does not have an adjustment factor for strengthening or weakening hurricanes...with particular emphasis on weakening storms. The pressure in a weakening storm is not very representative of it's actual maximum wind potential. An example would be Katrina prior to landfall, the maximum wind speeds decelerated much faster than the pressure rise. This is similar to most weakening storms, so the 1:1, Pressure:Wind convention will not work for weakening systems. But this is a pretty cool little tool for hurricanes otherwise.

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Subject Posted by Posted on
* HurriSheet... Intensity and Surge Estimations from Pressure danielwAdministrator Mon Jul 23 2007 05:08 AM
. * * Re: HurriScale dem05   Mon Jul 23 2007 05:08 AM
. * * Re: HurriScale Hootowl   Thu May 03 2007 11:10 AM
. * * Re: HurriScale Lamar-Plant City   Tue May 01 2007 08:55 PM
. * * Re: HurriScale IMTechspec   Sun Jul 22 2007 03:48 AM
. * * Re: HurriScale RevUp   Tue Jul 24 2007 04:17 PM
. * * Experimental Wind Loading Data CoconutCandy   Wed Jul 25 2007 12:40 AM
. * * Re: HurriSheet... Intensity and Surge Estimations from Pressure danielwAdministrator   Wed Apr 15 2009 12:01 AM
. * * Re: HurriSheet... Intensity and Surge Estimations from Pressure danielwAdministrator   Wed Apr 22 2009 06:16 PM
. * * Re: HurriSheet... Intensity and Surge Estimations from Pressure Storm Hunter   Sat May 16 2009 05:53 PM
. * * Re: HurriSheet... Intensity and Surge Estimations from Pressure danielwAdministrator   Sun May 17 2009 02:00 PM
. * * Re: HurriScale danielwAdministrator   Thu May 03 2007 05:58 AM
. * * Wind Loading and the Saffir-Simpson Scale CoconutCandy   Fri Jul 20 2007 01:05 PM
. * * Re: Wind Loading and the Saffir-Simpson Scale audienceofone   Fri Jul 20 2007 02:01 PM
. * * Re: Wind Loading and the Saffir-Simpson Scale Ed DunhamAdministrator   Fri Jul 20 2007 09:54 PM
. * * Wind Loading and the Saffir-Simpson Scale CoconutCandy   Mon Jul 23 2007 11:43 PM
. * * Re: Wind Loading and the Saffir-Simpson Scale danielwAdministrator   Tue Jul 24 2007 12:25 AM

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