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498 

WWUS20 KWNS 041226

SEL9

SPC WW 041226

ARZ000-ILZ000-INZ000-KYZ000-MOZ000-MSZ000-TNZ000-042000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 89

NWS STORM PREDICTION CENTER NORMAN OK

725 AM CDT MON APR 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN ARKANSAS

       SOUTHERN ILLINOIS

       SOUTHERN INDIANA

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI

       NORTHERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 725 AM UNTIL 300

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 115 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF

PINE BLUFF ARKANSAS TO 35 MILES NORTH NORTHEAST OF EVANSVILLE

INDIANA.  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...CONTINUE...WW 87...WW 88...



DISCUSSION...TSTMS ARE GRADUALLY INTENSIFYING THIS MORNING ALONG AND

AHEAD OF COLD FRONT FROM AR INTO WRN KY.  12Z LIT SOUNDING SHOWED

THAT STRONG CAP WHICH WAS OBSERVED BY 04/00Z SOUNDINGS HAD BEEN

REMOVED...YIELDING AND MOIST AND STRONGLY SHEARED AIR MASS.  EXPECT

A COMBINATION OF LINE SEGMENTS AND SUPERCELLS TO EVOLVE WITH A

THREAT FOR DAMAGING WINDS...HAIL AND TORNADOES.  UPSCALE GROWTH INTO

A QLCS IS ANTICIPATED LATER TODAY WITH THE PRIMARY HAZARD

TRANSITIONING TO PRIMARILY DAMAGING WINDS.



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 25040.





...MEAD

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