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General Discussion >> Hurricane Ask/Tell

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yecatsjg
Weather Watcher


Reged: Sun
Posts: 26
Loc: Bradenton, FL
hurricane spawned tornadoes
      #44622 - Fri Jul 22 2005 08:22 AM

Have I heard correctly that tornadoes spawned by hurricanes are weaker? How so? Smaller? Lower wind speed?

Stacey


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LI Phil
User


Reged: Fri
Posts: 2637
Loc: Long Island (40.7N 73.6W)
Re: hurricane spawned tornadoes [Re: yecatsjg]
      #44634 - Fri Jul 22 2005 09:00 AM

a tornado can occur in a hurricane because of the tremendous instability in the atmosphere caused by the friction between a landfalling hurricane, and the area its affecting, particularly in its northeast quadrant where winds are the strongest, and the counterclockwise flow around it is prevalent. however, these tornadoes are usually minimal in strength, which is equivalent to F0 or F1 on the Fujita Scale.

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2005 Forecast: 14/7/4

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yecatsjg
Weather Watcher


Reged: Sun
Posts: 26
Loc: Bradenton, FL
Re: hurricane spawned tornadoes [Re: LI Phil]
      #44647 - Fri Jul 22 2005 09:34 AM

Thanks! When Dennis skirted up the coast we woke up at 7:30 am to my weather radio going offf due to a tornado warning. As I was grabbing kids out of beds and getting them to the bathroom I was thinking -- just HOW much weaker are these supposed to be, lol! Thankfully it ended up being a few miles from our home.

Stacey


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HanKFranK
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Reged: Mon
Posts: 1841
Loc: Graniteville, SC 33.56N 81.82W
Re: hurricane spawned tornadoes [Re: yecatsjg]
      #44662 - Fri Jul 22 2005 10:29 AM

F0 tornadoes cause tropical storm-like spot damage (mostly to trees). F1s cause hurricane-like spot damage. not enough to break a well-constructed house, but trailers and aluminum buildings beware. the higher category tornadoes are rare in tropical systems... one or two of them is sometimes enough to cause as much damage as 10-20 smaller tornadoes.
HF 1529z22july


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Lysis
User


Reged: Thu
Posts: 451
Loc: Hong Kong
Re: hurricane spawned tornadoes [Re: HanKFranK]
      #44713 - Fri Jul 22 2005 12:51 PM

Tornadoes in hurricanes:
Quite often people will say some of the more extreme, erratic damage from Charley was caused “by tornados”. This seems to be a common misconception among hurricane survivors and I don’t really understand why (as if they think hurricane force winds are incapable of catastrophic damage (???)). Do note that, statistically, only 2% of all tornadoes achieve greater wind velocities than the strongest hurricanes. At that, hurricane born tornadoes do not generally occur in the actual eye wall of the hurricane itself, but instead in the outer circulation and rain bands. However if you are in the eye, I imagine you have other stuff to worry about, so it probably isn’t much consolation.

On another note, I have often observed little vortices swirling around on the ground, made evident with all the moisture and debris flying around, both in storms I have been through, and on the videos of several storm chasers. I guess the air is just so chaotic that stuff happens. Can you relate to that, Hank?

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cheers

Edited by Lysis (Fri Jul 22 2005 12:54 PM)


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Keith234
Storm Chaser


Reged: Thu
Posts: 921
Loc: 40.7N/73.3W Long Island
Re: hurricane spawned tornadoes [Re: Lysis]
      #44898 - Sat Jul 23 2005 12:46 PM

Vorticies inside the eye are a complex weather thing. There are posts lying around here that pertain to that topic. I suggest you do a search first...

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"I became insane with horrible periods of sanity"
Edgar Allan Poe


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Lysis
User


Reged: Thu
Posts: 451
Loc: Hong Kong
Re: hurricane spawned tornadoes [Re: Keith234]
      #44949 - Sat Jul 23 2005 03:32 PM

No... not anything large scale like that... just a bunch of little spins going about. One is evident in my film during the outer outer eye wall. Go to about 7:45 and watch the water under the bow of the boat.

Go to 1:32 and again to about 1:48 in this video of hurricane Dennis and you will see the same thing:

http://www.stormvideographer.com/weathervine/dennis_reel.wmv

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cheers

Edited by Lysis (Sat Jul 23 2005 03:37 PM)


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