

506 

WWUS20 KWNS 160050

SEL0

SPC WW 160050

KSZ000-OKZ000-TXZ000-160700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 310

NWS STORM PREDICTION CENTER NORMAN OK

750 PM CDT FRI MAY 15 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST KANSAS

       SOUTHWEST...CENTRAL...AND NORTHEAST OKLAHOMA

       EXTREME NORTHWEST TEXAS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 750 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF

CHILDRESS TEXAS TO 20 MILES WEST NORTHWEST OF SPRINGFIELD

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 305...WW 306...WW

307...WW 308...WW 309...



DISCUSSION...THE BROKEN BAND OF FRONTAL CONVECTION WILL CONTINUE TO

MOVE SEWD TOWARD THE I-44 CORRIDOR INTO THE OVERNIGHT HOURS...WHILE

OTHER DRYLINE CONVECTION SPREADS EWD INTO SW OK/NW TX.  THE 00Z OUN

SOUNDING REVEALS STRONG INSTABILITY S AND E OF THE ONGOING

STORMS...AS WELL AS A SUBSTANTIAL CAP THAT WILL REQUIRE FOCUSED

LOW-LEVEL ASCENT TO BREACH.  IT APPEARS THE MORE PROBABLE SCENARIO

IS FOR A DAMAGING WIND AND HAIL THREAT TO CONTINUE ALONG THE FRONT

FOR THE NEXT SEVERAL HOURS...WITH SOME POTENTIAL FOR MERGING

CLUSTERS TO LEAD TO DEVELOPMENT OF A BOWING MCS NEAR OR JUST S OF

THE I-40 CORRIDOR FROM WRN INTO CENTRAL OK.



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 550. MEAN STORM

MOTION VECTOR 28025.





...THOMPSON

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