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558 

WWUS20 KWNS 292102

SEL4

SPC WW 292102

OKZ000-TXZ000-300400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 64

NWS STORM PREDICTION CENTER NORMAN OK

400 PM CDT FRI MAR 29 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN OKLAHOMA

       WESTERN AND NORTHWEST TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 400 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 65 MILES NORTH OF

CLINTON OKLAHOMA TO 50 MILES SOUTHEAST 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.



DISCUSSION...TSTMS EXPECTED TO FORM IN THE NEXT HOUR OR SO OVER

PARTS OF THE TX S PLNS...THE TX LOW ROLLING PLNS...AND NW TX AS

ASCENT ASSOCIATED WITH NM UPR IMPULSE CONTINUES ESEWD. SOME STORMS

MAY ARISE WITHIN EXISTING ACCAS/WAA FIELD DOWNSTREAM FROM NM

SYSTEM...WHILE OTHERS ARISE ALONG DIFFUSE DRY LINE/LEE TROUGH

SEGMENTS NOW EDGING E TOWARD THE LBB AREA. FARTHER NE...OTHER STORMS

MAY FORM ALONG DIFFUSE FRONT EXTENDING ENE FROM THE SRN TX PANHANDLE

INTO NW OK.

WHILE WNWLY DEEP SHEAR WILL REMAIN FAIRLY MODEST /AROUND 35

KTS/...UNIDIRECTIONAL CLOUD-LAYER FLOW AND STEEP MID LVL LAPSE RATES

SHOULD PROMOTE HAIL PRODUCTION GIVEN PERSISTENT LOW-LVL MOISTURE

INFLOW. AND...GIVEN EXPECTED CONCENTRATION OF

CONVECTION...CONSOLIDATION OF STORM COLD POOLS MAY SUPPORT EVOLUTION

INTO ONE OR TWO MCSS WITH A RISK FOR LOCALLY DMGG WIND/HAIL INTO

TNGT.



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 450. MEAN STORM

MOTION VECTOR 29020.





...CORFIDI

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