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Special Tropical Weather Outlook issued for area in the East-Central Atlantic, only with 10% chance for development, not expected to do much.
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General Discussion >> Hurricane Ask/Tell
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spinup
Weather Watcher


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tropical, non-tropical, subtropical, extratropical
      #77972 - Wed Sep 05 2007 08:23 PM

99L is currently being described by the NHC in their Tropical Weather Discussion as being non-tropical at this time (4PM 9/5/07). It looks like a pretty good spinner to me.
The NHC is also saying that a small increase in organization could result in the formation of a tropical or subtropical cyclone.
Hurricanes and tropical storms that move into the northern latitudes and are petering out are typically described as becoming extratropical.
Can someone please help me understand the difference between them all?

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Clark
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Re: tropical, non-tropical, subtropical, extratropical [Re: spinup]
      #77976 - Wed Sep 05 2007 09:20 PM

Tropical cyclones are warm-cored entities -- tropical storms, hurricanes, etc. Wind speeds are at a maximum close to the center.

Extratropical cyclones are most easily described as "things with fronts." Highly asymmetric, tilt to the west with increasing altitude, can be cold or warm-cored in nature. Wind speeds are at a maximum a fair distance away from the center.

Subtropical cyclones lie between the two. They are usually extratropical cyclones that have cut-off from the midlatitude flow and have hybrid characteristics -- a little bit of both types with most characteristics lying between the two extremes. Often warm-cored at the surface but cold-cored aloft.

--------------------
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(or view them on the main page for any active Atlantic storms!)

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