danielw
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| (Moderator) |
| Sun Jul 13 2008 01:52 PM |
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Re: Bertha Vortex Message
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Quote:
That's only at Flight Level, that they are finding hurricane-force winds, though, and if you use an 80% reduction, it only leaves winds of 62.5mph at the surface. Not sure how they determine whether to use 90% or 80% reduction from the flight level.
Currently, 2008, they use 90% for most of the 700mb or 10,000 foot level winds.
The other adjustments are for the 1000mb and 850mb flight levels which are mainly used on INVEST flights for Tropical Depressions and Tropical Storms with low wind speeds.
1000mb flight level is rarely used as it's usually too close to the water for Safety purposes.