URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 143
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CDT FRI APR 15 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHEAST ARKANSAS
MISSOURI BOOTHEEL
NORTHERN MISSISSIPPI
WESTERN TENNESSEE
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900
PM CDT.
TORNADOES...HAIL TO 2 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 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF
DYERSBURG TENNESSEE TO 40 MILES SOUTH SOUTHEAST OF OXFORD
MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 140...WW 141...WW 142...
DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON ALONG COLD FRONT AS DEEP ASCENT IN EXIT
REGION OF MID AND UPPER-LEVEL JET STREAKS MOVES INTO THE REGION.
THE COMBINATION OF STRONG DAYTIME HEATING...BOUNDARY LAYER DEWPOINTS
OF 55-60 F AND COOLING MIDLEVEL TEMPERATURES WILL SUPPORT FURTHER
AIR MASS DESTABILIZATION WITH MLCAPE VALUES APPROACHING 1000-1500
J/KG. WHEN COUPLED WITH VERTICALLY-VEERING WIND
PROFILES...ENVIRONMENT WILL BE SUPPORTIVE OF SUPERCELLS AND BOWING
STRUCTURES WILL A RISK FOR TORNADOES...LARGE HAIL AND DAMAGING
WINDS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 24030.
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