

000 

WWUS20 KWNS 301258

SEL3

SPC WW 301258

IAZ000-ILZ000-MOZ000-LMZ000-301900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 393

NWS STORM PREDICTION CENTER NORMAN OK

755 AM CDT FRI MAY 30 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEASTERN IOWA

       WESTERN AND NORTHERN ILLINOIS

       NORTHEASTERN MISSOURI

       LAKE MICHIGAN



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 755 AM UNTIL 200

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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH SOUTHWEST OF

QUINCY ILLINOIS TO 25 MILES NORTHWEST OF MARSEILLES ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 392. WATCH NUMBER 392 WILL NOT BE IN EFFECT AFTER

755 AM CDT.



DISCUSSION...AIR MASS FCST TO DESTABILIZE THROUGHOUT REMAINDER

MORNING AHEAD OF EXISTING MCS MOVING EWD OUT OF SERN IA/NRN MO

REGION.  WELL DEFINED OUTFLOW BOUNDARY FROM CHICAGO METRO WSWWD

ACROSS NRN IL MAY PROVIDE ENHANCED LOW LEVEL

ASCENT/SRH/VORTICITY...AND MAY LIFT NWD SLIGHTLY DURING LATE MORNING

HOURS AHEAD OF CONVECTION.  DEEP-LAYER SHEAR AND INCREASING BOUNDARY

LAYER THETAE WILL FAVOR POTENTIAL FOR DAMAGING WIND AND POTENTIAL

FOR A FEW TORNADIC TSTMS WITH THIS CONVECTION.



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 26040.





...EDWARDS/CORFIDI

