

035 

WWUS20 KWNS 152238

SEL5

SPC WW 152238

ALZ000-ARZ000-MSZ000-TNZ000-160500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 425

NWS STORM PREDICTION CENTER NORMAN OK

535 PM CDT MON JUN 15 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       NORTHEAST AND EAST CENTRAL ARKANSAS

       NORTHERN MISSISSIPPI

       SOUTHWEST AND SOUTHERN MIDDLE TENNESSEE



EFFECTIVE THIS MONDAY AFTERNOON FROM 535 PM UNTIL MIDNIGHT 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST

SOUTHWEST OF JONESBORO ARKANSAS TO 35 MILES NORTHEAST OF GADSDEN

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 419...TORNADO WATCH NUMBER 422.

WATCH NUMBER 419 422 WILL NOT BE IN EFFECT AFTER 535 PM CDT.

CONTINUE...WW 420...WW 421...WW 423...WW 424...



DISCUSSION...BAND OF STRONG/SEVERE STORMS FROM NERN AR INTO SWRN

MIDDLE TN IS EXPECTED TO SPREAD SEWD THIS EVENING AS AGGREGATE COLD

POOL BEGINS TO CONSOLIDATE AND SURGE SEWD BENEATH INCREASINGLY NW

FLOW ALOFT.  AIRMASS SOUTH OF THE OUTFLOW BOUNDARY IS VERY MOIST

WITH SURFACE DEW POINTS IN THE LOW 70S WITH STRONG INSTABILITY

/MLCAPE TO 3000 J/KG/.  EFFECTIVE LAYER SHEAR OF 35-45 KT ACROSS THE

AREA WILL MAINTAIN POTENTIAL FOR ORGANIZED SEVERE STORMS INCLUDING

ISOLATED SUPERCELLS.  PRIMARY THREAT IS EXPECTED TO TRANSITION TO

DAMAGING WIND GUSTS AND LARGE HAIL THROUGH THE EVENING 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 550. MEAN STORM

MOTION VECTOR 27025.





...WEISS

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