

089 

WWUS20 KWNS 302210

SEL7

SPC WW 302210

ARZ000-ILZ000-KYZ000-MOZ000-MSZ000-TNZ000-010400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 217

NWS STORM PREDICTION CENTER NORMAN OK

510 PM CDT THU APR 30 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST ARKANSAS

       SOUTHEAST ILLINOIS

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI

       NORTHWEST MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 510 PM UNTIL

1100 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES WEST

SOUTHWEST OF MEMPHIS TENNESSEE TO 20 MILES WEST NORTHWEST OF

OWENSBORO KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ALONG AN AXIS

FROM CENTRAL AR INTO SOUTHEAST MO AND SOUTHERN IL.  THESE STORMS

WILL MOVE EASTWARD THROUGH A REGION OF MARGINAL INSTABILITY...BUT

SUFFICIENT DEEP LAYER VERTICAL SHEAR FOR A RISK OF ORGANIZED/SEVERE

STORMS.  BOWS/LEWPS ARE POSSIBLE WITH DAMAGING WINDS AND HAIL

POSSIBLE IN STRONGER CELLS.



AVIATION...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 450. MEAN STORM

MOTION VECTOR 24030.





...HART

