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WWUS20 KWNS 301942

SEL7

SPC WW 301942

ARZ000-LAZ000-MSZ000-TXZ000-310300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 67

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT SAT MAR 30 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHWEST ARKANSAS

       NORTHERN AND CENTRAL LOUISIANA

       FAR SOUTHWEST MISSISSIPPI

       NORTHEAST TEXAS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

1000 PM CDT.



HAIL TO 3 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTHWEST

OF LONGVIEW TEXAS TO 45 MILES EAST NORTHEAST OF ALEXANDRIA

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 66...



DISCUSSION...THREE STRONG TSTMS HAVE FORMED OR STRENGTHENED IN THE

PAST HOUR ALONG AND N OF OUTFLOW BOUNDARY LEFT FROM OVERNIGHT MCS

AND NOW ARCING FROM SE OK THROUGH NE TX INTO NRN LA. WHILE LARGE

SCALE SUBSIDENCE IN WAKE OF THE MCS LIKELY IS STILL OCCURRING OVER

THE REGION...SFC HEATING IN UPSTREAM /NE TX/ WARM SECTOR AND

CONTINUING PRESENCE OF COOL MID-LVL TEMPS MAY CONTINUE TO PROMOTE

STORM DEVELOPMENT/FURTHER STRENGTHENING. AMPLE /35 KT/ NWLY DEEP

SHEAR IS PRESENT FOR SUPERCELLS...WITH LARGE HAIL AND LOCALLY DMGG

WIND THE MAIN SVR THREATS. A TORNADO OR TWO CANNOT BE RULED OUT

GIVEN 25-30 KT 700 MB FLOW AND SIZABLE LOW-LVL DIRECTIONAL COMPONENT

TO SHEAR. ATTM...HOWEVER...THIS THREAT APPEARS TOO CONDITIONAL/LOW

TO WARRANT A TORNADO WATCH. NEVERTHELESS... ENVIRONMENT...ESPECIALLY

IN NE TX/NW LA...WILL CONTINUED TO BE MONITORED FOR POSSIBLE WATCH

UPGRADE THROUGH THE AFTN.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 34025.





...CORFIDI

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