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966 

WWUS20 KWNS 190657

SEL3

SPC WW 190657

OKZ000-TXZ000-191400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 83

NWS STORM PREDICTION CENTER NORMAN OK

155 AM CDT MON MAR 19 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN OKLAHOMA

       NORTHWEST TEXAS



EFFECTIVE THIS MONDAY MORNING FROM 155 AM UNTIL 900 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHEAST OF CLINTON OKLAHOMA TO 50 MILES SOUTHWEST OF WICHITA

FALLS 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 81...WW 82...



DISCUSSION...SQUALL LINE WITH EMBEDDED BOWING STRUCTURES IS EXPECTED

TO CONTINUE EWD INTO WRN OK AND NWRN TX EARLY THIS MORNING IN

ADVANCE OF PACIFIC FRONT ADVANCING ACROSS WRN TX.  AMBIENT AIR MASS

REMAINS MOIST AND MODERATELY UNSTABLE WITH MLCAPE OF 1000-1500 J/KG.

 GROWING COLD POOL ATTENDANT TO MCS SHOULD BE SUFFICIENT TO OVERCOME

CAP...ALLOWING FOR RENEWED...VIGOROUS UPDRAFT GROWTH ON THE LEADING

EDGE OF GUST FRONT.  WHILE A BRIEF TORNADO IS POSSIBLE OWING TO THE

STRONG LOW-LEVEL SHEAR...THE INCREASING OUTFLOW-DOMINANCE OF THIS

CONVECTIVE SYSTEM SUGGESTS THAT DAMAGING WINDS AND HAIL WILL BE THE

PRIMARY HAZARDS.



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 24035.





...MEAD

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