

874 

WWUS20 KWNS 011346

SEL1

SPC WW 011346

ARZ000-OKZ000-TXZ000-012000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 261

NWS STORM PREDICTION CENTER NORMAN OK

845 AM CDT SUN MAY 1 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       SMALL PART OF SOUTHEAST OKLAHOMA

       PARTS OF NORTH CENTRAL AND NORTHEAST TEXAS



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 845 AM UNTIL 300

PM 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST

OF FORT WORTH TEXAS TO 70 MILES EAST NORTHEAST OF TEXARKANA

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 259...TORNADO WATCH NUMBER 260.

WATCH NUMBER 259 260 WILL NOT BE IN EFFECT AFTER 845 AM CDT.



DISCUSSION...STRONG/SEVERE THUNDERSTORMS WILL CONTINUE TO BE A

THREAT ALONG AND N OF NEARLY STATIONARY FRONTAL ZONE FROM SWRN AR TO

S OF DAL/FTW AREA.  WITH 50KT OF BRN SHEAR COUPLED WITH A VERY

MOIST/MDTLY UNSTABLE WARM SECTOR BEING LIFTED ACROSS

BOUNDARY..CONDITIONS ARE FAVORABLE FOR LINE SEGMENTS/ELEVATED

SUPERCELLS TO CONTINUE TRACKING ENEWD THRU THE WATCH AREA THRU EARLY

TO MID AFTERNOON. PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING

WIND WITH TORNADO POTENTIAL POSSIBLY INCREASING NEARER THE BOUNDARY

BY MID AFTERNOON.



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 26035.





...HALES

