

243 

WWUS20 KWNS 222308

SEL2

SPC WW 222308

TXZ000-230500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 182

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT FRI APR 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN TEXAS



EFFECTIVE THIS FRIDAY NIGHT FROM 610 PM UNTIL MIDNIGHT CDT.



HAIL TO 3 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST

NORTHWEST OF SHERMAN TEXAS TO 40 MILES WEST OF BROWNWOOD TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...CONTINUE...WW 179...WW 180...WW 181...



DISCUSSION...THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY ALONG THE DRY

LINE WESTERN PORTION OF THE WATCH.  WITH STRONG INSTABILITY AND

STEEP LAPSE RATES...SUPERCELLS ARE LIKELY.  WITH HIGH LCLS AND

MARGINAL LOW LEVEL SHEAR...VERY LARGE HAIL AND DAMAGING DOWNBURSTS

WINDS ARE THE PRIMARY THREAT AS STORMS MOVE EWD ACROSS THE WATCH

THRU THE EVENING.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27025.





...HALES

