AREAS AFFECTED...NRN IL/NWRN IND
CONCERNING...SEVERE THUNDERSTORM WATCH 504...
VALID 310010Z - 310115Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 504
CONTINUES.
SUMMARY...SVR TSTMS OVER NRN IL/NWRN IND WILL CONT MOVING SWD AND
MAY REQUIRE LOCAL WFO EXTENSION OF WW 504.
DISCUSSION...A CLUSTER OF SVR TSTMS OVER THE SRN SUBURBS OF CHICAGO
WILL MOVE S AT 30 KTS AND WILL MOST LIKELY POSE A CONTINUED SVR
THREAT BEYOND THE AREAS CURRENTLY COVERED WITHIN WW 504. THE LEADING
EDGE OF A BOWING SEGMENT OF SVR TSTMS CURRENTLY EXTENDS ACROSS THE
SRN PORTIONS OF THE CHICAGO METRO AREA AND CONTINUES TO MOVE SWD
TOWARDS THE SRN PERIPHERY OF WW 504. WITH A WELL-DEVELOPED COLD POOL
ESTABLISHED AND MODERATE-STRONG INSTABILITY IN THE IMMEDIATE
DOWNSTREAM ENVIRONMENT...THE SVR THREAT MAY CONTINUE FOR A FEW MORE
HOURS INTO AREAS SOUTH OF CURRENT WW. THE NEED FOR A NEW WW BEYOND
02Z IS UNCERTAIN...HOWEVER CONVECTIVE TRENDS WILL CONTINUE TO BE
MONITORED.
..BUNTING/CORFIDI.. 08/31/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...LOT...ILX...DVN...
LAT...LON 40508811 41108912 41498920 41808915 41898882 41578780
41618717 41678692 41578668 41298655 40828654 40548739
40508811
