| Hugh |
| (Senior Storm Chaser) |
| Sun Sep 07 2008 09:36 PM |
Re: Wind Speeds and Category
|
Quote:
100kt flight level wind reduces to roughly 90mph at the surface.
Flight level wind in knots x 1.15 = flight level wind in mph x 0.90 = surface wind estimate. This is for the 700mb or 10000ft flight level. But it is close enough for the lower levels.
Uh, check your math Danny
100kt = 115mph at flight level...
115mph FL * .9 = 103.5mph at the surface
I always look at flight level winds in knots, and just use the same rough number in MPH at the surface, since .9 * 1.15 is 1.035, which is close enough to 1.