

080 

WWUS20 KWNS 210045

SEL3

SPC WW 210045

ALZ000-ARZ000-LAZ000-MSZ000-210700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 173

NWS STORM PREDICTION CENTER NORMAN OK

745 PM CDT WED APR 20 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN ALABAMA

       PARTS OF SOUTHEAST ARKANSAS

       SMALL PART OF NORTHEAST LOUISIANA

       PARTS OF NORTHERN AND CENTRAL MISSISSIPPI



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 745 PM

UNTIL 200 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST OF

GREENVILLE MISSISSIPPI TO 30 MILES EAST OF TUSCALOOSA ALABAMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 168...SEVERE THUNDERSTORM WATCH

NUMBER 169. WATCH NUMBER 168 169 WILL NOT BE IN EFFECT AFTER 745

PM CDT. CONTINUE...WW 170...WW 171...



DISCUSSION...SEVERE THUNDERSTORMS INCLUDING SUPERCELLS CONTINUE TO

REDEVELOP VICINITY OF OUTFLOW BOUNDARY FROM NRN MS ESEWD INTO

CENTRAL AL. WITH MLCAPES AOA 2000 J/KG AND 40KT OF DEEP LAYER

SHEAR...LARGE HAIL WILL CONTINUE TO BE A THREAT...PARTICULARLY

ASSOCIATED WITH ANY SUPERCELL.



AVIATION...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 27020.





...HALES

