

650 

WWUS20 KWNS 081745

SEL8

SPC WW 081745

INZ000-KYZ000-TNZ000-090000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 268

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM CDT FRI MAY 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN INDIANA

       MUCH OF CENTRAL AND PARTS OF EASTERN KENTUCKY

       MUCH OF  MIDDLE AND PARTS OF EASTERN TENNESSEE



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL

700 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

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

NORTHEAST OF LOUISVILLE KENTUCKY TO 40 MILES SOUTH SOUTHWEST OF

CROSSVILLE TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 267...



DISCUSSION...MATURE DERECHO CONTINUES RAPIDLY EWD WITH WIDESPREAD

DAMAGING WINDS.  AIR MASS WHILE NOT QUITE AS UNSTABLE AS FURTHER

W...IS BECOMING MDTLY UNSTABLE ACROSS THE WATCH AND WILL SUPPORT

CONTINUATION OF DAMAGING WINDS ALONG WITH BRIEF/ISOLATED

TORNADOES...PARTICULARLY ASSOCIATED WITH THE MESO CYCLONE

ACCOMPANYING THE DERECHO.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 26045.





...HALES

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