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General Discussion >> Hurricane Ask/Tell

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BillW
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Reged: Tue
Posts: 1
Loc: Tx. Gulf Coast
Wind speed measurement?
      #63104 - Tue Oct 25 2005 05:20 PM

Does the Official wind speed of a storm coming out of the NHC include the forward component (i.e. ~50MPH with Wilma as I type this) or just the circular component?

Bill


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Convergence
Weather Watcher


Reged: Sat
Posts: 35
Loc: Ellicott City, Maryland
Re: Wind speed measurement? [Re: BillW]
      #63108 - Tue Oct 25 2005 05:32 PM

Just the circular component.

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Chris Bryant
Verified CFHC User


Reged: Tue
Posts: 17
Re: Wind speed measurement? [Re: Convergence]
      #63134 - Wed Oct 26 2005 08:46 AM

That was a question I was going to ask
So.. when Wilma had 115 mph winds, and was moving at 50 mph, the winds on the east side were 165 and on the west 65?

Edited by Chris Bryant (Wed Oct 26 2005 08:47 AM)


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Convergence
Weather Watcher


Reged: Sat
Posts: 35
Loc: Ellicott City, Maryland
Re: Wind speed measurement? [Re: Chris Bryant]
      #63155 - Wed Oct 26 2005 06:11 PM

Quote:

That was a question I was going to ask
So.. when Wilma had 115 mph winds, and was moving at 50 mph, the winds on the east side were 165 and on the west 65?




Yes, pretty much. Vector addition! You can see why that would have been rather unpleasant for New England.


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ClarkModerator
Meteorologist


Reged: Wed
Posts: 1710
Loc: 45.95N 84.55W
Re: Wind speed measurement? [Re: BillW]
      #63396 - Sun Oct 30 2005 04:24 PM

The NHC intensity estimates DO include forward motion factored into them. It is inherent to recon measurements and for recurving storms they will take it into account when determining storm intensity. The other posts are incorrect in assuming that the forward speed needs to be added or subtracted into the NHC intensity.

The clearest example comes from the last discussion on Wilma:
"THE INITIAL INTENSITY OF 75 KT IS BASED ON A SATELLITE INTENSITY FROM TAFB AND RESPECT FOR THE RAPID MOTION." (http://www.nhc.noaa.gov/archive/2005/dis/al242005.discus.043.shtml?)

Most storms where forward motion needs to be accounted for are storms that are rapidly weakening in an extratropical environment and undergoing extratropical transition, for which storm asymmetry is a very important consideration. The NHC knows this and takes this into account in their estimates.

--------------------
Current Tropical Model Output Plots
(or view them on the main page for any active Atlantic storms!)


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