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Historic #HurricaneBeryl now in the Caribbean with a day or few left before shear is expected to increase. Elsewhere, Invest 96L is not doing so well.

Days since last H. Landfall - US: Any 306 (Idalia) , Major: 306 (Idalia) Florida - Any: 306 (Idalia) Major: 306 (Idalia)

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General Discussion >> Hurricane Ask/Tell

Ed Dunham
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)

Reged:
Posts: 2565
Loc: Melbourne, FL

Re: Nicole
Sun Oct 10 2004 10:13 AM

The NHC regularly issues updates whenever a subtropical cyclone is detected. Often a subtropical system can acquire tropical characteristics over time.

From the NHC/TPC Glossary of Terms:
Subtropical Cyclone:
A non-frontal low pressure system that has characteristics of both tropical and extratropical cyclones.

The most common type is an upper-level cold low with circulation extending to the surface layer and maximum sustained winds generally occurring at a radius of about 100 miles or more from the center. In comparison to tropical cyclones, such systems have a relatively broad zone of maximum winds that is located farther from the center, and typically have a less symmetric wind field and distribution of convection.

A second type of subtropical cyclone is a mesoscale low originating in or near a frontolyzing zone of horizontal wind shear, with radius of maximum sustained winds generally less than 30 miles. The entire circulation may initially have a diameter of less than 100 miles. These generally short-lived systems may be either cold core or warm core.

Subtropical Depression:
A subtropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) is 33 kt (38 mph or 62 km/hr) or less.

Subtropical Storm:
A subtropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) is 34 kt (39 mph or 63 km/hr) or more.

Hope this helps.
ED

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Subject	Posted by	Posted on
Nicole	Terra	Sun Oct 10 2004 10:13 AM
Re: Nicole	Ed Dunham	Sun Oct 10 2004 10:13 AM
Re: Nicole	Ed Dunham	Sun Oct 10 2004 11:18 AM
Re: Nicole	Keith234	Sun Oct 10 2004 11:54 AM
Re: Nicole	Ed Dunham	Mon Oct 11 2004 07:56 AM
Re: Nicole	Keith234	Mon Oct 11 2004 01:35 PM
Re: Nicole	LI Phil	Tue Oct 12 2004 05:50 PM
Re: Nicole	Keith234	Tue Oct 12 2004 06:14 PM
Re: Nicole	LI Phil	Tue Oct 12 2004 09:20 PM
Re: Nicole	Keith(234)	Tue Oct 26 2004 07:31 PM
Re: Nicole	HumanCookie	Sun Oct 10 2004 11:53 AM
Re: Nicole	Storm Cooper	Sun Oct 10 2004 11:38 AM
Re: Nicole	Keith234	Sun Oct 10 2004 09:57 AM

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