SVR warning for high flood-risk

Joined
Mar 3, 2004
Messages
1,143
Location
Mt Prospect, IL
Ok I have never seen this before, but a long-term SVR warning has been issued for north-central IL this morning. It was posted as an upgrade to the FFW that had been in effect earlier. The rain is coming down hard, but I would not ever call it a severe thunderstorm. I know we aren't supposed to post full weather bulletins here, but I would like to call some attention to it. Has this type of warning ever been posted before. Is it just a mistake by NWS and they meant to extend the FFW?

http://ahps2.wrh.noaa.gov/ahps2/ahp...lc037&productType=Severe Thunderstorm Warning

Also, my GR3 estimates 5 to as much as 8 inches of rain down since the event began and flooding is quite evident as I look out my window at the creek across the road. It's coming up just a bit.
 
The 6-hour long timeframe, extremely large size, and no reference to severe thunderstorms in the text, might be clues to what happened ;)

And the SVS issued right afterwards has some insight:

430 AM CDT SAT SEP 13 2008

...THE SEVERE THUNDERSTORM WARNING FOR LA SALLE...KENDALL...
NORTHWESTERN GRUNDY...LEE...DEKALB...KANE...EASTERN OGLE...SOUTHERN
BOONE...MCHENRY AND SOUTHEASTERN WINNEBAGO COUNTIES IS CANCELLED...

Finally...

433 AM CDT SAT SEP 13 2008

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES IN ILLINOIS...
SOUTHERN BOONE...
DEKALB COUNTY...
LA SALLE...
LEE...
EASTERN OGLE...
SOUTHEASTERN WINNEBAGO...
NORTHWESTERN GRUNDY...
KANE COUNTY...
KENDALL...
MCHENRY...

* UNTIL 1030 AM CDT...
 
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