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WWUS20 KWNS 072340

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 257

NWS STORM PREDICTION CENTER NORMAN OK

640 PM CDT SAT JUN 7 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHERN ALABAMA

  MIDDLE TENNESSEE



* EFFECTIVE THIS SATURDAY NIGHT FROM 640 PM UNTIL MIDNIGHT CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHEAST OF

NASHVILLE TENNESSEE TO 15 MILES SOUTHWEST OF HUNTSVILLE ALABAMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 252...WW 253...WW

254...WW 255...WW 256...



DISCUSSION...LOOSELY-ORGANIZED BANDS OF STORMS IN MODESTLY SHEARED

ENVIRONMENT EXPECTED TO CONTINUE SPREADING GENERALLY E ACROSS THE

MIDDLE TN VLY THROUGH LATER THIS EVE. WHILE BOTH BUOYANCY AND SHEAR

DIMINISH WITH EWD EXTENT...REGION WILL BE GLANCED BY ASCENT AND

STRONGER WIND FIELD ASSOCIATED WITH PROGRESSIVE MID-MS VLY UPR VORT.

THIS MAY SUPPORT A RISK FOR SVR HAIL AND WIND IN STRONGER UPDRAFTS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 26025.





...CORFIDI

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