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WWUS20 KWNS 111533

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SPC WW 111533

ARZ000-KYZ000-MSZ000-TNZ000-112200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 128

NWS STORM PREDICTION CENTER NORMAN OK

1030 AM CDT MON APR 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF EASTERN ARKANSAS

       PARTS OF SOUTH CENTRAL KENTUCKY

       MUCH OF NORTHERN MISSISSIPPI

       PARTS OF CENTRAL AND MIDDLE TENNESSEE



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1030 AM UNTIL

500 PM CDT.



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

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF

MONTICELLO ARKANSAS TO 60 MILES EAST NORTHEAST OF BOWLING GREEN

KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...STRONG S/WV TROUGH AND ASSOCIATED WIND FIELD ROTATING

EWD ACROSS LWR MS VALLEY THIS AFTERNOON DEVELOPING A SURFACE WAVE ON

FRONTAL ZONE SRN AR.  STRONG HEATING WILL INCREASE INSTABILITY EWD

AHEAD OF ONGOING CONVECTION ACROSS THE WATCH.  THUNDERSTORMS

INCREASING ACROSS CENTRAL SRN AR WILL MOVE RAPIDLY NEWD AHEAD OF THE

SURFACE LOW WITH AN ENHANCED WIND PROFILE SUPPORTING BOTH DAMAGING

WINDS AND POSSIBLE TORNADOES THRU THE AFTERNOON.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24040.





...HALES

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