From the SPC:
MESOSCALE DISCUSSION 0998
NWS STORM PREDICTION CENTER NORMAN OK
0918 AM CDT SAT MAY 24 2008
AREAS AFFECTED...FL PENINSULA
CONCERNING...OUTLOOK UPGRADE
VALID 241418Z - 241515Z
THE FLORIDA PENINSULA WILL BE UPGRADED TO A SLIGHT RISK OF SEVERE
STORMS IN THE FORTHCOMING 1630Z OUTLOOK WITH MORE DETAILS TO FOLLOW.
ADDITIONALLY...A WW MAY BE NEEDED BY 1630Z.
CONDITIONS APPEAR FAVORABLE FOR PULSE SEVERE STORMS TO DEVELOP ONCE
AGAIN TODAY AHEAD OF AN APPROACHING UPPER SHORT WAVE TROUGH. 500 MB
TEMPERATURES ON OBSERVED 12Z SOUNDINGS ACROSS FL TODAY OF NEAR -8 TO
-10 C WILL COOL FURTHER AS THE MAIN TROUGH AXIS DIGS SWD. THIS IN
COMBINATION WITH TEMPERATURES IN THE MID 80S TO LOWER 90S AND DEW
POINTS IN THE 70S WILL CREATE A MODERATELY TO VERY UNSTABLE AIR MASS
OVER MUCH OF THE FLORIDA PENINSULA WITHIN THE NEXT FEW HOURS.
ALTHOUGH SHEAR IS GENERALLY WEAK...SEA BREEZE DEVELOPMENT...MAINLY
ALONG THE EAST COAST...AND OUTFLOW BOUNDARIES WILL PROVIDE FOCUS FOR
INTENSE STORMS CAPABLE OF DMGG WINDS AND HAIL. ADDITIONALLY...WITH
PWAT VALUES CLOSE TO 2 INCHES LOCALLY HEAVY RAINFALL IS LIKELY. A WW
MAY NEED TO BE ISSUED WITHIN THE NEXT 2 HOURS.
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