Tuesday, November 24, 2009

Possible Action in the Morning Hours

The rain was coming down in buckets earlier. God, I LOVE it. And because regular weather reports do not suffice with me, I had to go to NOAA-SPC and do my own scoping, mesoanalysis stuff. Also keeping up on the reports. The latest one being this:

SPC AC 250029

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0629 PM CST TUE NOV 24 2009

VALID 250100Z - 251200Z

...NO SVR TSTM AREAS FORECAST...

...FL...
WATER VAPOR IMAGERY SHOWS A LARGE CLUSTER OF SHOWERS AND
THUNDERSTORMS OVER THE CENTRAL GULF OF MEXICO. THIS ACTIVITY IS LIKELY ASSOCIATED WITH A SOUTHERN STREAM UPPER JET MAX THAT IS FORECAST TO TRACK EAST-NORTHEASTWARD OVERNIGHT AND APPROACH THE FL PENINSULA BY 25/12Z.  A MOIST AND MARGINALLY UNSTABLE AIR MASS IS NOW IN PLACE OVER FL...WITH DEEP LAYER VERTICAL SHEAR SUFFICIENT FOR SOME RISK OF ROTATING STORMS. HOWEVER...00Z RAOBS SUGGEST THAT LOW LEVEL VERTICAL SHEAR IS WEAK AND MID LEVEL LAPSE RATES POOR. THIS IS EXPECTED TO LIMIT THE INTENSITY OF STORMS AS THEY SPREAD INTO THE REGION LATE TONIGHT. AN ISOLATED TORNADO CANNOT BE RULED OUT...BUT CURRENT INDICATIONS ARE THAT THREAT DOES NOT WARRANT A SLIGHT RISK

This means that radiosonde observations are showing that we do have some shear in place, and although it is weak, it may be enough to fuel a mesocyclone. But possibly not since the adiabatic lapse rates are not significant. Still, the deadliest tornadoes have occurred at night when they can't be seen that well. If you hear a loud roar, people, get your asses to the safest place you have!  Since we have no basements to speak of in Florida, an interior room or narrow hallway is a good option, somewhere away from windows and anything breakable. Throw a blanket over you, if you have time.

If you are outside: find a low-lying area or a ditch. DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. I can't say this to enough people. Folks have been killed doing that. The possibility of the winds ripping you out from under there are just too great.

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