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Alberto moving into Mexico, but large windfield causing surge flooding along Texas Coast. Also Invest 92L now being tracked east of the Bahamas.

Days since last H. Landfall - US: Any 295 (Idalia) , Major: 295 (Idalia) Florida - Any: 295 (Idalia) Major: 295 (Idalia)

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General Discussion >> Hurricane Ask/Tell

Clark
Meteorologist

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Posts: 1710

Re: Spring Tornadic Activity
Sun Apr 03 2005 05:44 AM

Severe weather season has been a bit subdued until recently, but across the nation, we were near-average for February and March and well-above average for January, this likely due to a lot of tornadoes in California. Over the past few weeks, we've seen activity increase over the south-central U.S., but the east coast itself isn't as favorable for tornado formation climatologically (nor has it been this year).

Simply put, tornado formation is favored in regions of strong vertical shear...especially in the lowest part of the atmosphere. This is created where you have winds at different directions between these levels of the atmosphere and enhanced by having slower winds nearer the surface and stronger winds further aloft. This pattern tends to happen when you have an upper-level low passing nearby but to the north and west, resulting in strong, nearly west winds aloft and southerly winds near the surface. Most of the storms this year -- and climatologically as well -- tend to move either along the coast, keeping the threat near to the coastline, or a good distance to the west of the Appalachians, keeping the threat further west. This is an oversimplification of the problem - you need favorable thermodynamical factors (such as heating) as well - but helps to highlight one of the main reasons for such a pattern.

Things will continue to become more favorable as we head further intro Spring, but moreso over the south central US.

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Entire topic
Subject	Posted by	Posted on
Eye replacement	Keith234	Sun Apr 03 2005 05:44 AM
Re: Eye replacement	Clark	Fri Feb 18 2005 06:23 AM
Spring Tornadic Activity	B.C.Francis	Sat Apr 02 2005 06:34 PM
Re: Spring Tornadic Activity	Clark	Sun Apr 03 2005 05:44 AM
Re: Spring Tornadic Activity	B.C.Francis	Sun Apr 03 2005 07:04 PM
Re: Spring Tornadic Activity	Clark	Thu May 05 2005 03:56 AM
Re: Spring Tornadic Activity	B.C.Francis	Wed May 11 2005 06:02 PM
Re: Spring Tornadic Activity	Clark	Thu May 12 2005 08:27 PM
Questions and Answers to Landfall Probability Numbers	B.C.Francis	Tue May 03 2005 04:00 PM
Re: Questions and Answers to Landfall Probability Numbers	B.C.Francis	Tue May 03 2005 04:10 PM
Re: Eye replacement	Clark	Wed Sep 01 2004 01:28 AM
Re: Eye replacement	scott	Sat Oct 23 2004 01:47 AM
Re: Eye replacement	Keith234	Sat Oct 23 2004 01:51 AM
Re: Eye replacement	LI Phil	Wed Sep 01 2004 12:37 AM
Re: Eye replacement	Keith234	Wed Sep 01 2004 01:28 AM

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