

106 

WWUS20 KWNS 171627

SEL2

SPC WW 171627

ILZ000-KYZ000-MOZ000-TNZ000-180000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 332

NWS STORM PREDICTION CENTER NORMAN OK

1225 PM EDT THU JUN 17 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ILLINOIS

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI

       WESTERN AND MIDDLE TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL

800 PM EDT.



HAIL TO 1.5 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 105

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST

NORTHEAST OF CAPE GIRARDEAU MISSOURI TO 75 MILES WEST OF

CHATTANOOGA TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...MULTICELL STORMS INCLUDING AN MCS OVER SRN IL AND

ANOTHER MCS OVER MIDDLE TN EMBEDDED WITHIN MODEST NWLY FLOW ALOFT

ARE EXPECTED TO INTENSIFY AS THEY DEVELOP SEWD THROUGH A

DESTABILIZING ATMOSPHERE. MLCAPE FROM 2000-3000 J/KG AND AN UNSTABLE

BOUNDARY LAYER WILL SUPPORT A THREAT OF DAMAGING WIND AND HAIL AS

STORMS CONTINUE SEWD.



AVIATION...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 30030.





...DIAL

