#147 Postby tallywx » Fri May 27, 2005 3:46 pm
It's so interesting to see the psychology of how hurricanes are held up to such a higher "standard" than other wind occurrences of similar of even less magnitude. If significant damage occurs from a hurricane, well that means it COULDN'T have been less than 130 mph SUSTAINED winds that caused it.
But let's think for a minute at what 115 MPH, or even 100 MPH sustained winds can do. A severe thunderstorm warning is issued, among other things, for when wind GUSTS reach 58 mph or higher. That's considered "severe." When derechos trek across the country and produce wind GUSTS of 90 mph, perhaps up to 100 mph, that's considered extreme, and cause quite widespread damage.
Yet when a hurricane causes widespread damage, people find it unfathomable to think that a 90-105 mph SUSTAINED wind could do that.
Let's recall one thing from Charleston and Hurricane Hugo. The highest sustained windspeed the Charleston International Airport recorded was 78 mph. Repeat, 78 mph. Peak gust...98 mph. Less than 100 mph, folks. Downtown Charleston? Try 87 mph gusts to 108 mph. Let's recall what type of damage that did to the city.
So when we see that Pensacola NAS sustained and gusted to around the same speed as in downtown Charleston...in other words, high category 1/low category 2 conditions in isolated spots, it is not a stretch to consider the extent of damage that such winds can cause. A 100 mph wind, even in gusts, is a heck of a lot of wind.
Another example: Hurricane Kate in 1985, which "blasted" through Tallahassee, FL. Trees down everywhere. Power out to 90% of residents, in some places for up to two weeks. The highest wind GUST reported at the Tallahassee Regional Airport from that storm...68 mph. Tropical storm force. Some private gauges caught upwards of 80-85 mph gusts, depending on where you were in the city. Gusts barely into category 1 hurricane force range. Seared into Tallahasseeans memories...considered the worst disaster ever to hit the city.
As for damage patterns, one can tell NOTHING about sustained winds because the extent of damage that occurs was created by the maximum wind experienced...in other words, the gusts. If you see roofs taken off homes in a pattern that suggests 130 mph winds...sure, but those were the gusts that did it.
Last edited by
tallywx on Fri May 27, 2005 3:58 pm, edited 3 times in total.
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