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090 

WWUS20 KWNS 182107

SEL3

SPC WW 182107

TXZ000-190400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 853

NWS STORM PREDICTION CENTER NORMAN OK

405 PM CDT SUN SEP 18 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST THROUGH NORTH CENTRAL TEXAS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 405 PM UNTIL

1100 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST

NORTHEAST OF SHERMAN TEXAS TO 50 MILES WEST SOUTHWEST OF JUNCTION

TEXAS.  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...CONTINUE...WW 852...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH THROUGH

EARLY EVE IN WW AREA...ESPECIALLY IMMEDIATELY AHEAD OF MAIN NE-SW

WIND SHIFT LINE NOW MOVING SE TOWARD FWD.  MORE WDLY SCTD STORMS ARE

EXPECTED SWWD THROUGH WRN PARTS OF THE HILL COUNTRY TO THE BIG BEND

REGION...AND ISOLD STRONG STORMS MAY PERSIST IN AREA NEAR CRS.

WHILE WIND FIELD WILL REMAIN MODEST...DEGREE OF INSTABILITY AND

GLANCING INFLUENCE OK VORT LOBE WILL CREATE ENVIRONMENT FAVORABLE

FOR SUSTAINED STORMS/STORM CLUSTERS WITH SVR HAIL/WIND.  ACTIVITY

NEAR FWD MAY CONSOLIDATE INTO AN MCS THAT FORWARD PROPAGATES E OR

SEWD LATER THIS EVE.



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.





...CORFIDI

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