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928 

WWUS20 KWNS 162142

SEL7

SPC WW 162142

ARZ000-MOZ000-MSZ000-TNZ000-170400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 487

NWS STORM PREDICTION CENTER NORMAN OK

445 PM CDT THU JUN 16 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND EASTERN ARKANSAS

       BOOTHEEL OF MISSOURI

       NORTHWEST MISSISSIPPI

       PARTS OF WESTERN TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 445 PM UNTIL

1100 PM CDT.



HAIL TO 2.5 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 5 MILES SOUTH

SOUTHWEST OF HOT SPRINGS ARKANSAS TO 40 MILES NORTHEAST OF

MEMPHIS TENNESSEE.  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 483...WW 484...WW

485...WW 486...



DISCUSSION...AIR MASS ACROSS WATCH HAS BECOME QUITE UNSTABLE WITH

STORMS DEVELOPING ALONG EXISTING BOUNDARIES.  WITH APPROACH OF MCV

OVER NCENTRAL AR STORMS WILL CONTINUE TO INCREASE IN NUMBER AND

INTENSITY WITH LARGE HAIL AND DOWNBURST WINDS ASSOCIATED WITH MOST

INTENSE CELLS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27020.





...HALES

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