BillW
Registered User
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Posts: 1
Loc: Tx. Gulf Coast
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Does the Official wind speed of a storm coming out of the include the forward component (i.e. ~50MPH with as I type this) or just the circular component?
Bill
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Convergence
Weather Watcher
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Posts: 35
Loc: Ellicott City, Maryland
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Just the circular component.
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Chris Bryant
Verified CFHC User
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Loc: NC
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That was a question I was going to ask 
So.. when 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 12:47 PM)
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Convergence
Weather Watcher
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Posts: 35
Loc: Ellicott City, Maryland
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Quote:
That was a question I was going to ask
So.. when 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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Clark
Meteorologist
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The 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 intensity.
The clearest example comes from the last discussion on :
"THE INITIAL INTENSITY OF 75 KT IS BASED ON A SATELLITE INTENSITY FROM 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 environment and undergoing transition, for which storm asymmetry is a very important consideration. The knows this and takes this into account in their estimates.
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