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WWUS20 KWNS 010607

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SPC WW 010607

ARZ000-LAZ000-MSZ000-TXZ000-011000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 152

NWS STORM PREDICTION CENTER NORMAN OK

110 AM CDT TUE APR 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       NORTHERN LOUISIANA

       WEST CENTRAL MISSISSIPPI

       EXTREME NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING FROM 110 AM UNTIL 500 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 45

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

SOUTHWEST OF TEXARKANA ARKANSAS TO 35 MILES SOUTHEAST OF

GREENVILLE MISSISSIPPI.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 151...



DISCUSSION...SCATTERED STRONG/SEVERE THUNDERSTORMS WILL CONTINUE TO

FORM ALONG AND N OF THE COMPOSITE OUTFLOW BOUNDARY THAT IS MOVING

SWD FROM AR TOWARD NRN LA AND NW MS.  THE STRONGER INSTABILITY FEED

WILL RESIDE FROM E/NE TX INTO NW LA UNTIL THE LLJ WEAKENS LATER THIS

MORNING...AND THE STRONGEST STORMS COULD MAINTAIN SUPERCELL

STRUCTURES WITH THE THREAT FOR LARGE HAIL.  THE LARGE HAIL THREAT

APPEARS TO BE MORE MARGINAL TOWARD THE MS RIVER...BUT SHOULD

CONTINUE FOR THE NEXT FEW HOURS.



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 30025.





...THOMPSON

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