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WWUS20 KWNS 041805

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SPC WW 041805

ALZ000-TNZ000-042300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 93

NWS STORM PREDICTION CENTER NORMAN OK

105 PM CDT MON APR 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND NORTHERN ALABAMA

       SOUTHERN MIDDLE TENNESSEE



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 600

PM CDT.



TORNADOES...HAIL TO 1.5 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 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF

HUNTSVILLE ALABAMA TO 35 MILES SOUTHEAST OF TUPELO MISSISSIPPI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 89...WW 90...WW 91...WW

92...



DISCUSSION...MATURING QLCS WILL CONTINUE TO SURGE EWD ACROSS MS/TN

TOWARD WRN AND NRN AL.  ADDITIONAL ISOLATED STORM DEVELOPMENT WILL

BE POSSIBLE IN ADVANCE OF THE FRONTAL SQUALL LINE.  A COMBINATION OF

MID 60S BOUNDARY LAYER DEWPOINTS...SURFACE TEMPERATURES IN THE

70S...AND STRONG SWLY SHEAR PROFILES WILL FAVOR MAINTENANCE OF THE

QLCS WITH AN ATTENDANT RISK FOR DAMAGING WINDS.  A COUPLE OF

TORNADOES WILL ALSO BE POSSIBLE IF THE PRE-FRONTAL CONVECTION CAN

DEVELOP SUPERCELL CHARACTERISTICS PRIOR TO BEING OVERTAKEN BY THE

LINE...AND WITH EMBEDDED QLCS CIRCULATIONS.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 26040.





...THOMPSON

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