

448 

WWUS20 KWNS 210815

SEL4

SPC WW 210815

ALZ000-FLZ000-MSZ000-CWZ000-211500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 4

NWS STORM PREDICTION CENTER NORMAN OK

310 AM CDT THU JAN 21 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND SOUTHERN ALABAMA

       THE WESTERN FLORIDA PANHANDLE

       SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING FROM 310 AM UNTIL 1000 AM CDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 90 MILES WEST SOUTHWEST OF

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 3...



DISCUSSION...NNE/SSW QLCS IN CNTRL MS EXPECTED TO CONTINUE

ENEWD...WHILE ADDITIONAL STORMS/CLUSTERS CONTINUE TO FORM NEAR

SHALLOW WARM FRONT NOW EXTENDING FROM S CNTRL MS TO THE WRN FL

PANHANDLE.  DEEP WIND FIELD ACROSS REGION...ALREADY SUPPORTIVE OF

SUPERCELLS... SHOULD FURTHER STRENGTHEN AS EXIT REGION OF 100+ KT

250 MB JET STREAK CONTINUES ESE ALONG THE CNTRL GULF CST.  ALTHOUGH

WEAK BOUNDARY LAYER INSTABILITY/RESIDUAL RAIN-COOLED SFC LAYER

LIKELY WILL MITIGATE OVERALL SVR THREAT...POTENTIAL WILL

NEVERTHELESS EXIST FOR SPORADIC DMGG WIND GUSTS AND TORNADOES.  THE

LATTER THREAT MAY BE GREATEST WITH EMBEDDED SUPERCELLS IN THE

QLCS...AND WITH ANY MORE DISCRETE/LONGER-LASTING STRUCTURES NEAR

WARM FRONT.  OVERALL THREAT SHOULD SHIFT GRADUALLY ENE WITH TIME.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 24040.





...CORFIDI

