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Unseasonably stout wave in Caribbean bringing enhanced showers and tstorms for several days, but lacks model support for development 5/26
Days since last H. Landfall - US: Any 272 (Idalia) , Major: 272 (Idalia) Florida - Any: 272 (Idalia) Major: 272 (Idalia)
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General Discussion >> Hurricane Ask/Tell
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Clark
Meteorologist


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Posts: 1710
Re: Major Hurricane Dean Moving Westward
      Fri Aug 17 2007 11:00 PM

More intense hurricanes have deeper vertical circulations, meaning that they extend to higher altitudes. At higher altitudes, the mid-latitude steering patterns are often a bit better defined than they are at lower altitudes. This manifests itself in the preferred steering layers for tropical cyclones of various intensities (see http://cimss.ssec.wisc.edu/tropic/real-time/atlantic/winds/winds-dlm.html for more). Thus, for deeper storms, there is an increased likelihood of a more northerly track.

Larger, more intense storms also often have an increased magnitude to the Beta drift, a northwestward steering flow component (just a few mph in magnitude at its peak, but still significant) that can lead to an increased poleward motion of these storms. The dynamics of the beta drift and how it comes about are beyond the scope of this discussion, but basically there are gyres within each hurricane that impart a background flow toward the NW across the center of the storm's circulation.

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Entire topic
Subject Posted by Posted on
* ensemble intensities, ofci intensity spinup Fri Aug 17 2007 11:00 PM
. * * Re: Major Hurricane Dean Moving Westward Goosus   Fri Aug 17 2007 09:51 PM
. * * Re: Major Hurricane Dean Moving Westward Clark   Fri Aug 17 2007 11:00 PM
. * * Re: Major Hurricane Dean Moving Westward Brian B   Fri Aug 17 2007 10:36 PM
. * * Re: Major Hurricane Dean Moving Westward Clark   Fri Aug 17 2007 11:02 PM
. * * a spinning top on a ball....? SeaMule   Fri Aug 17 2007 02:18 PM
. * * Re: ensemble intensities, ofci intensity Clark   Fri Aug 17 2007 06:00 AM
. * * Re: ensemble intensities, ofci intensity spinup   Fri Aug 17 2007 02:24 PM
. * * Re: ensemble intensities, ofci intensity Clark   Fri Aug 17 2007 04:45 PM

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