URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 107
NWS STORM PREDICTION CENTER NORMAN OK
135 PM CDT THU APR 2 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN AND CENTRAL ALABAMA
THE WESTERN FLORIDA PANHANDLE
SOUTHEAST MISSISSIPPI
SOUTHERN MIDDLE TENNESSEE
COASTAL WATERS
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 135 PM UNTIL
800 PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 90 MILES NORTH OF HUNTSVILLE
ALABAMA TO 50 MILES SOUTHWEST OF PENSACOLA FLORIDA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 103...WW 104...WW
105...WW 106...
DISCUSSION...A PRE-FRONTAL BAND OF SEVERE STORMS IN MS WILL SPREAD
EWD/NEWD INTO AL/TN DURING THE NEXT FEW HOURS IN ASSOCIATION WITH A
LEAD SHORTWAVE TROUGH EJECTING AHEAD OF THE PRIMARY SYNOPTIC WAVE
NEAR TXK. THOUGH THE ONGOING GULF COAST CONVECTION HAS DISRUPTED
MOIST INFLOW ACROSS AL AND WILL TEND TO LIMIT THE ERN EXTENT OF THE
SEVERE THREAT FOR THE NEXT FEW HOURS...BOUNDARY LAYER DEWPOINTS IN
THE 60S AND SOME HEATING IN CLOUD BREAKS WILL CONTRIBUTE TO
SUFFICIENT INSTABILITY TO MAINTAIN A SEVERE STORM THREAT A LITTLE
FARTHER W THROUGH THE AFTERNOON. LOCAL VWP/S ALSO SHOW SUFFICIENT
VEERING AND SPEED INCREASES WITH HEIGHT TO SUPPORT SUPERCELLS AND AN
ATTENDANT THREAT FOR A FEW TORNADOES...LARGE HAIL...AND DAMAGING
WINDS THROUGH THE AFTERNOON.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25035.
