

000 

WWUS20 KWNS 282312

SEL6

SPC WW 282312

ARZ000-TXZ000-290600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 636

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT SAT JUN 28 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       NORTHERN AND CENTRAL TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 610 PM

UNTIL 100 AM CDT.



HAIL TO 1.5 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 30 MILES WEST

SOUTHWEST OF ABILENE TEXAS TO 40 MILES NORTH NORTHEAST OF EL

DORADO ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 629...WW 630...WW

633...WW 634...WW 635...



DISCUSSION...WRN END OF ELONGATED N TX/SE OK MCS HAS MOVED INTO AN

AREA SUPPORTIVE OF MODEST FORWARD /SWD/ PROPAGATION...WITH LARGE LOW

LVL TEMP-DEWPOINT SPREADS...15 KT SLY LLJ...AND 15-20 KT NNW MID LVL

FLOW.  SCTD EMBEDDED STORMS MAY YIELD OCCASIONAL SPOTS OF DMGG WIND.

 FARTHER E ACROSS SE OK/SW AR...GREATER SHEAR/HIGHER PW ENVIRONMENT

MAY YIELD SMALL EMBEDDED BOWS WITH WET MICROBURSTS/HAIL.  SOME STORM

IN THIS REGION MAY PERSIST INTO LATE TONIGHT AS LLJ STRENGTHENS AND

VEERS.



AVIATION...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 33015.





...CORFIDI

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