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218 

WWUS20 KWNS 150328

SEL4

SPC WW 150328

OKZ000-TXZ000-151100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 174

NWS STORM PREDICTION CENTER NORMAN OK

1030 PM CDT SAT APR 14 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST OKLAHOMA

       WESTERN TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1030 PM

UNTIL 600 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 10 MILES WEST

NORTHWEST OF ALTUS OKLAHOMA TO 35 MILES SOUTH OF BIG SPRING

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 169...WW 170...WW

171...WW 172...WW 173...



DISCUSSION...TSTMS ARE EXPECTED TO EXPAND RAPIDLY ALONG PACIFIC

FRONT-DRYLINE OCCLUSION.  AMBIENT AIR MASS IS MOIST AND MODERATELY

UNSTABLE WITH 50+ KT OF DEEP WLY SHEAR.  WHILE THE PRIMARY

CONVECTIVE MODE IS EXPECTED TO BE LINEAR...THE ENVIRONMENT WILL

SUPPORT EMBEDDED SUPERCELL AND BOWING STRUCTURES CAPABLE OF LARGE

HAIL AND DAMAGING WINDS.



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 24035.





...MEAD

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