

851 

WWUS20 KWNS 060037

SEL7

SPC WW 060037

ILZ000-INZ000-060700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 267

NWS STORM PREDICTION CENTER NORMAN OK

735 PM CDT SAT JUN 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EAST CENTRAL AND NORTHEAST ILLINOIS

       EXTREME NORTHWEST INDIANA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 735 PM

UNTIL 200 AM 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 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST OF BLOOMINGTON

ILLINOIS TO 20 MILES NORTH NORTHEAST OF DANVILLE ILLINOIS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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 266...



DISCUSSION...SUPERCELLS ARE DEVELOPING IN A BROKEN BAND ACROSS W/NW

IL...WELL EAST OF THE SYNOPTIC COLD FRONT AND MIDLEVEL TROUGH IN IA.

 GIVEN THE PRESENCE OF ASCENT/MOISTENING IN ADVANCE OF THE WAVE /PER

00Z DVN SOUNDING/...THE STORMS SHOULD BE SUSTAINED THROUGH THE

EVENING ACROSS IL.  MODERATE INSTABILITY AND STRONG LOW-MIDLEVEL

SHEAR WILL SUPPORT SUPERCELLS CAPABLE OF PRODUCING A FEW

TORNADOES...AS WELL AS DAMAGING WINDS AND ISOLATED LARGE HAIL



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

500. MEAN STORM MOTION VECTOR 27030.





...THOMPSON

