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WWUS20 KWNS 150723

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ARZ000-LAZ000-MOZ000-MSZ000-TNZ000-TXZ000-151500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 139

NWS STORM PREDICTION CENTER NORMAN OK

220 AM CDT FRI APR 15 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN AND SOUTHERN ARKANSAS

       NORTHERN LOUISIANA

       THE MISSOURI BOOTHEEL

       WESTERN AND NORTHERN MISSISSIPPI

       WEST TENNESSEE

       NORTHEAST TEXAS



EFFECTIVE THIS FRIDAY MORNING FROM 220 AM UNTIL 1000 AM CDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF

DYERSBURG TENNESSEE TO 15 MILES SOUTH SOUTHEAST OF NATCHITOCHES

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 136...SEVERE THUNDERSTORM WATCH NUMBER 138. WATCH

NUMBER 136 138 WILL NOT BE IN EFFECT AFTER 220 AM CDT.



DISCUSSION...AR/NW LA/NE TX QLCS WITH EMBEDDED SUPERCELLS/LEWPS

EXPECTED TO CONTINUE GENERALLY EWD AT 40 KTS THROUGH MID

MORNING...WITH SOME DECELERATION/BREAK-UP POSSIBLE TOWARD/AFTER

SUNRISE.  AHEAD OF THE SQLN...MORE ISOLD...SLIGHTLY ELEVATED STORMS

MAY CONTINUE TO FORM IN WAA ZONE OVER NRN MS/NEAR/W TN.  OTHER ISOLD

STORMS...PERHAPS SFC-BASED...MAY FORM IN MOISTENING 50+ KT CONFLUENT

LOW-LVL FLOW OVER CNTRL MS.  STRENGTH OF LOW-LVL AND DEEP

SHEAR...DEGREE OF FORCING FOR ASCENT...AND PRESENCE OF EXISTING

SUSTAINED STORMS SUGGEST CONTINUED LIKELIHOOD FOR SVR SFC

WINDS...ISOLD TORNADOES...AND POSSIBLY SVR HAIL.



AVIATION...TORNADOES AND 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 26040.





...CORFIDI

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