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WWUS20 KWNS 211549

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 580

NWS STORM PREDICTION CENTER NORMAN OK

950 AM CST SAT DEC 21 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  SOUTHERN ARKANSAS

  WESTERN AND CENTRAL LOUISIANA

  EASTERN TEXAS

  COASTAL WATERS



* EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 950 AM UNTIL

  600 PM CST.



* PRIMARY THREATS INCLUDE...

  SEVERAL INTENSE TORNADOES POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 5 MILES EAST SOUTHEAST OF

ANGLETON TEXAS TO 40 MILES EAST NORTHEAST OF EL DORADO ARKANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



&&



DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INTENSIFY TODAY WHILE

MOVING RAPIDLY NORTHEAST ACROSS THE WATCH AREA.  WHILE THE

ATMOSPHERE IS ONLY MARGINALLY UNSTABLE...THE PRESENCE OF VERY STRONG

VERTICAL SHEAR AND INTENSIFYING LARGE-SCALE FORCING FOR ASCENT WILL

PROMOTE EMBEDDED SUPERCELLS AND BOWING STRUCTURES CAPABLE OF

TORNADOES --SOME POSSIBLY SIGNIFICANT-- AND CORRIDORS OF WIND

DAMAGE.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.

MEAN STORM MOTION VECTOR 22050.





...MEAD

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