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WWUS20 KWNS 012235

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TNZ000-020300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 126

NWS STORM PREDICTION CENTER NORMAN OK

635 PM EDT SAT MAY 1 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN MIDDLE AND SOUTHEAST TENNESSEE



EFFECTIVE THIS SATURDAY EVENING FROM 635 PM UNTIL 1100 PM EDT.



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 35 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 90 MILES WEST SOUTHWEST OF

CROSSVILLE TENNESSEE TO 65 MILES EAST SOUTHEAST OF CROSSVILLE

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 124. WATCH NUMBER 124 WILL NOT BE IN EFFECT AFTER

635 PM EDT. CONTINUE...WW 125...



DISCUSSION...REMNANT MCS WILL CONTINUE TO MOVE EWD ACROSS SRN MIDDLE

AND SERN TN THE NEXT FEW HOURS...FED BY A MOISTURE INFLUX FROM THE S

ATOP AND SLOW-MOVING FRONT NEAR THE SRN TN BORDER.  THOUGH THE

CONVECTION IN THE NRN PART OF THE WATCH MAY REMAIN SLIGHTLY

ELEVATED...THE STORMS ALONG THE IMMEDIATE FRONT/OUTFLOW ACROSS SRN

TN WILL BE ROOTED AT OR VERY NEAR THE SURFACE.  GIVEN THE MOISTURE

INFLUX FROM THE S AND STRENGTH OF VERTICAL SHEAR IN LOCAL VWP/S...A

FEW EMBEDDED ROTATING STORMS AND AN ATTENDANT THREAT FOR A TORNADO

OR TWO WILL PERSIST FOR A FEW MORE HOURS.  DAMAGING WINDS AND LARGE

HAIL SHOULD BE THE MORE COMMON THREATS IN THE WATCH AREA THIS

EVENING.



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

450. MEAN STORM MOTION VECTOR 26025.





...THOMPSON

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