Clouds, But Not Much Rain Today

The Thursday morning map discussion video is on the server:

http://beta.abc3340.com/weather/video.hrb

As March weather systems go, the one passing through today is pretty much a wimp. Clouds, maybe a few sprinkles, and that is about it.

A fresh surge of cooler and drier air rolls in here late tonight, and tomorrow should be a mostly sunny but cool day for Alabama.

But, interesting times are ahead....

THE WEEKEND: Clouds roll in here on Saturday, and some rain should reach the state Saturday night as a major late winter storm continues to develop and strengthen over the southwest U.S. Sunday looks very cool, and very wet. Rain should fall much of the day with temperatures holding in the low 50s. Looks like a great afternoon for a long Sunday nap.

Not much doubt Monday will be wet. Probably very wet. But, will we have any risk of severe storms? A close call on us breaking into the warm sector. The 06Z GFS runs the surface low from Tyler, Texas to Tupelo, which could keep the warm sector mainly over the southern half of the state. And, even down in South Alabama the quality of the warm sector is very much in question; I just don't know if we can get mid 60 dewpoints in here. For now we will mention a good chance of rain and thunderstorms... we can adjust the severe weather threat as we get closer.

We might have an issue with flash flooding before the rain ends late Monday night; amounts of 2 to 4 inches sure look possible over the northern half of the state from Saturday night through Monday night.

MIDDLE OF SPRING BREAK WEEK: This period, Tuesday through Thursday, should be dry but cool.

END OF SPRING BREAK WEEK: We get wet again. This time, a storm system will move through the northern Gulf of Mexico, with rain Friday into Saturday. And yes, there continue to be hints of snow on the northern periphery of this system. Late March snow flakes over North Alabama? Stranger things have happened... but lets wait before we jump on that idea.

LONG RANGE: The 06Z GFS shows a very cold upper trough over the eastern U.S. at the first of April. I doubt if we see low 80s again until sometime in mid-April. This past weekend was just a tease... temperatures should be cooler than normal here on an average basis for the next three weeks.

I will be back on a somewhat normal schedule today; I have a big midday meeting, and will be in the office in plenty of time to get everything updated by 3:30 as usual. Yesterday was one of those long days...
Posted by Craig  
on March 16, 2006, 8:37 am
When we talk about severe weather "parameters" I'm curious about something. Is there a parameter or set of parameters that we know of that make tornadoes more likely to actually touch down. I know we look at CAPE, helicity, instability, etc to forecast the development of thunderstorms likely to produce rotation, but do any of the parameters suggest to us that tornados actually reach the ground? Thanks!

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