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952 

WWUS20 KWNS 161949

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SPC WW 161949

LAZ000-170100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 164

NWS STORM PREDICTION CENTER NORMAN OK

250 PM CDT THU MAY 16 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  NORTHERN LOUISIANA



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 250 PM UNTIL

  800 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF

SHREVEPORT LOUISIANA TO 45 MILES NORTH NORTHEAST OF ALEXANDRIA

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 163...



DISCUSSION...A SHORT BOWING LINE SEGMENT WITH WEAK ROTATION ON THE

SRN FLANK HAS SHOWN SIGNS OF INTENSIFYING RECENTLY.  STORM IS MOVING

INTO AN INCREASINGLY FAVORABLE THERMODYNAMIC ENVIRONMENT AS

EVIDENCED BY RECENT DOWNSTREAM CU FIELD DEVELOPMENT WHERE STRONG

HEATING IS OCCURRING.  18Z SHV RAOB AND LATEST SHV VAD PROFILE SHOW

STRONG VEERING WITH HEIGHT AND SUFFICIENT SHEAR TO SUPPORT AN

ORGANIZED SEVERE THREAT WITH SUPERCELLS AND POTENTIAL FOR A TORNADO

OR TWO.



AVIATION...TORNADOES AND 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 28025.





...WEISS

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