Sunday, February 17, 2008

Severe weather possible

There will be a chance of severe weather today over the southern half of Alabama. The air is too cool and stable across North Alabama. As is almost always the case this time of the year, helicity, or veering of winds with height is very impressive but the big question is the instability. At this writing dewpoints in South Alabama are near 60, and the air is increasingly unstable. There is a capping inversion which will break either by the unstable air ahead of the main squall line or by the forcing associated with the line. There is a possibility of redevelopment later today as the squall line is well out ahead of the cold front. Much of South Alabama has been placed under a tornado watch and there have been tornado reports overnight in Louisiana. More to come as this situation develops...

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