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WWUS20 KWNS 031419

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OKZ000-TXZ000-032200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 132

NWS STORM PREDICTION CENTER NORMAN OK

920 AM CDT TUE APR 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN OKLAHOMA

       NORTH-CENTRAL TEXAS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 920 AM UNTIL

500 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST

NORTHEAST OF ARDMORE OKLAHOMA TO TEMPLE 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.



DISCUSSION...VORTICITY MAXIMUM PIVOTING AROUND SRN HIGH PLAINS UPPER

LOW HAS GIVEN RISE TO ELEVATED TSTMS WITHIN A THERMODYNAMIC

ENVIRONMENT CHARACTERIZED BY STEEP MIDLEVEL LAPSE RATES AND MUCAPE

OF 2000-2500 J/KG.  GIVEN EFFECTIVE BULK SHEAR OF AROUND 40

KT...SETUP WILL SUPPORT SUPERCELLS CAPABLE OF MAINLY LARGE HAIL.



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 24030.





...MEAD

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