Re: Question
Posted by
Chris in Tampa on 10/3/2015, 10:59 am
Do you mean a phenomenon where a fast moving hurricane would for some reason have higher gusts than a slower moving hurricane that had the exact same sustained wind speed? Maybe a soon to be weakening storm that started moving faster at landfall happened to have higher wind gusts mixing down to the surface before it finally started weakening? I don't know. (seems like I have heard something along those lines before, but not sure if it is true)
The sustained wind speed in a storm includes the forward speed.
Take the following values for the first two passes of recon in Joaquin this morning...
Northwest Quadrant:
Flight Level Wind (30 sec. Avg.): 85 knots
Peak (10 sec. Avg.) Flight Level Wind: 86 knots
SFMR Peak (10s Avg.) Sfc. Wind: 82 knots
Northeast Quadrant:
Flight Level Wind (30 sec. Avg.): 86 knots
Peak (10 sec. Avg.) Flight Level Wind: 94 knots
SFMR Peak (10s Avg.) Sfc. Wind: 83 knots
Southeast Quadrant
Flight Level Wind (30 sec. Avg.): 126 knots (~ 145.0 mph)
Peak (10 sec. Avg.) Flight Level Wind: 129 knots (~ 148.5 mph)
SFMR Peak (10s Avg.) Sfc. Wind: 100 knots (~ 115.1 mph)
Southwest Quadrant:
Flight Level Wind (30 sec. Avg.): 122 knots (~ 140.4 mph)
Peak (10 sec. Avg.) Flight Level Wind: 123 knots (~ 141.5 mph)
SFMR Peak (10s Avg.) Sfc. Wind: 92 knots (~ 105.9 mph)
Some of the strongest winds are in the SE quadrant. With the way the storm is moving that is expected. The sustained winds are based on the highest winds found though. So if the storm was not moving at all, it might have all four quadrants with rather similar winds, and that I don't think is what you are talking about perhaps. If you were to compare where you are to the other side of the storm, then there would be a difference.
If the storm goes west of Bermuda, they get the worst.
For an East Coast storm offshore that zips along parallel to the coast, the winds over land would be less. Lets say a 75 mph hurricane going 50mph. In some places on land the wind could be just 25 mph. Due to vectors and strength of convection is, it would vary of course. Maybe the half of the storm over land 25 to 50mph and the half over water 50 to 75mph. That's a simplistic example.
Recon just found Joaquin to be much stronger. Must go over some of the numbers. |
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10/3/2015, 10:02 am- Re: Question - Chris in Tampa, 10/3/2015, 10:59 am
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