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434 

WWUS20 KWNS 261641

SEL5

SPC WW 261641

MSZ000-270000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 725

NWS STORM PREDICTION CENTER NORMAN OK

1140 AM CDT TUE OCT 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL MISSISSIPPI



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1140 AM UNTIL 700

PM 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 65 STATUTE

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

TUPELO MISSISSIPPI TO 10 MILES SOUTH SOUTHEAST OF JACKSON

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 721...WW 722...WW

723...WW 724...



DISCUSSION...CLEARING IN THE WAKE OF GRAVITY WAVE AND AHEAD OF COLD

FRONT HAS ALLOWED TEMPERATURES TO WARM INTO THE LOW/MID 80S.  AND

WHILE MIDLEVEL LAPSE RATES ARE EXPECTED TO REMAIN POOR...THE

BOUNDARY LAYER WARMING COUPLED WITH DEW POINTS IN THE UPPER 60S TO

AROUND 70 F ARE EXPECTED TO YIELD A MODERATELY UNSTABLE ENVIRONMENT

THIS AFTERNOON WITH MLCAPE INCREASING TO 1000-2000 J/KG.  WHEN

COUPLED WITH RELATIVELY STRONG LOW AND DEEP-LAYER SHEAR...SETUP WILL

FAVOR THE DEVELOPMENT OF SUPERCELLS CAPABLE OF A FEW TORNADOES IN

ADDITION TO LOCALLY DAMAGING WIND GUSTS.



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 24035.





...MEAD

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