AREAS AFFECTED...PORTIONS OF CENTRAL/SRN IL...W-CENTRAL/SWRN IND
CONCERNING...SEVERE THUNDERSTORM WATCH 508...
VALID 312309Z - 010015Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 508
CONTINUES.
SUMMARY...SVR TSTMS ARE EXPECTED TO CONTINUE...PRIMARILY ACROSS ERN
TWO-THIRDS OF WW. A MORE CONCENTRATED SVR WIND THREAT MAY EVOLVE
FROM SVR TSTMS NEAR DNV THROUGH EARLY EVENING.
DISCUSSION...MESOANALYSIS REVEALS A FRONTAL BOUNDARY EXTENDING GENLY
E/SEWD FROM A WEAK SFC LOW NEAR DNV TO NEAR IND...AND A SFC
TROF/WIND SHIFT EXTENDING SWD FROM THE LOW INTO SRN IL. STG/OCNLY
SVR TSTMS CONTINUE ALONG THE FRONT AND SFC TROF. SOME ADDITIONAL
INCREASE IN COVERAGE IS POSSIBLE THRU THE EARLY EVENING HOURS AS THE
FRONTAL BOUNDARY SAGS SWD INTO A STRONGLY UNSTABLE AND UNCAPPED AIR
MASS. SUBTLE ADDITIONAL FORCING FROM AN UPPER LEVEL IMPULSE MOVING
EWD ACROSS THE NRN OH VALLEY MAY ALSO CONTRIBUTE TO ADDITIONAL
DEVELOPMENT.
ALTHOUGH EFFECTIVE SHEAR REMAINS WEAK /AOB 25 KTS/...TSTMS MAY
ORGANIZE AROUND MERGING COLD POOLS AND MOVE SEWD WITH A
LOCALLY-ENHANCED SVR WIND/HAIL THREAT THROUGH 02-03Z. THIS APPEARS
MOST LIKELY TO OCCUR NEAR THE INTERSECTION OF THE FRONT AND SURFACE
TROF CURRENTLY NEAR DNV...WHERE TSTM COVERAGE/COLD POOL GENERATION
POTENTIAL IS GREATEST.
..BUNTING/CORFIDI.. 08/31/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...IND...PAH...LOT...ILX...LSX...
LAT...LON 40218973 40428929 40518874 40488805 40388720 40258682
39948634 39578598 39028628 38748655 38498681 38418710
38458758 38628813 39068918 39208956 39628990 39908999
40218973
