Minor flooding was reported across parts of Winnebago County on April 11th.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LOT wrote it up.
Minor flooding was reported across parts of Winnebago County on April 11th.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before the first event at Apr 11, 2:02 AM CST, 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 302 AM CDT FRI APR 11 2008 .DISCUSSION... 257 PM CDT ALL EYES REMAIN ON THE STORM SYSTEM TAKING AIM ON THE REGION. MASSIVE PRECIPITATION ARC EXTENDING FROM NORTHERN OHIO ALL THE WAY BACK TO NEBRASKA IS ALL RELATED TO STRONG WARM AIR ADVECTION OUT AHEAD OF THE CORE OF THE SYSTEM. WITH A 40-50 LOW LEVEL JET PUMPING UP INTO THIS SYSTEM...THERE IS AN AMPLE AMOUNT OF MOISTURE BEING TRANSPORTED INTO THE REGION. THE MAIN LLJ AXIS SHOULD CONTINUE TO GLIDE EASTWARD OVERNIGHT...TAKING THE INITIAL BAND OF MODERATE TO HEAVY RAIN WITH IT. BASED ON RADAR ESTIMATES...ABOUT A QUARTER TO A HALF INCH OF RAIN HAS ALREADY FALLEN THIS MORNING AND EARLY AFTERNOON. WITH THE AMOUNT OF RAIN THAT HAS FALLEN OVER THE PAST TWO DAYS...THERE REALLY IS NOT MUCH EXTRA SPACE IN THE CURRENTLY SATURATED SOIL FOR ANY MORE RAIN. FLASH FLOOD GUIDANCE IS AT ABOUT AN INCH AND A HALF PER HOUR BEFORE FLASH FLOODING OCCURS...WHICH IS RELATIVELY LOW. GIVEN THE CHANCES FOR STORM REDEVELOPMENT LATER THIS AFTERNOON AND THIS EVENING...WILL KEEP THE FLASH FLOOD WATCH GOING FOR THE ENTIRE FORECAST AREA ALTHOUGH HEAVY RAINFALL LIKELY WILL NOT BE AS WIDESPREAD AS PREVIOUSLY FORECAST. RIVER FORECASTS ARE ALSO ANTICIPATED TO COME DOWN A BIT TO NOT AS MAJOR OF FLOODING AS PREVIOUSLY FORECAST. AS FOR THE SEVERE THREAT FOR THE REST OF THIS AFTERNOON AND TONIGHT...IT STILL APPEARS AS THOUGH THE SLIGHT RISK ISSUED BY THE SPC IS VALID AS THE MAIN SWATH OF LIGHT TO MODERATE RAINFALL MOVES OUT AND THE WARM FRONT MOVES INTO THE REGION. SCATTERED CONVECTION HAS ALREADY STARTED TO POP UP IN THE DRY SLOT ACROSS WESTERN ILLINOIS AND THIS ACTIVITY IS ANTICIPATED TO MOVE INTO THE CWA WITHIN THE NEXT FEW HOURS. FORECAST SOUNDINGS INDICATE THAT MOST OF THE INSTABILITY IS RATHER ELEVATED AND NOT SURFACE BASED...SO THE MAIN THREAT OF THE STORMS WILL LIKELY BE DAMAGING WINDS OR HAILERS. TEMPERATURES HAVE CLIMBED TO THE LOW 60S SOUTH OF THIS WARM FRONT WITH DEW POINTS UP AROUND 60. THE AMOUNT OF SHEAR IN PLACE IS RATHER SUBSTANTIAL AND SHOULD BE ABLE TO OVERCOME ANY INITIAL INSTABILITY ISSUES OUT THERE. 0-1KM BULK SHEAR ALONG THE WARM FRONT IS ON THE ORDER OF 45 TO 55KTS WITH 0-6KM BULK SHEAR UP ABOUT 90 TO 100KTS. ANY DISCRETE STORM CELLS OR CLUSTERS MAY EVENTUALLY END UP MERGING INTO A SQUALL LINE LATER ON TONIGHT. AS HAS BEEN ADVERTISED THE PAST FEW DAYS..THE ENTIRE SYSTEM BECOMES FAIRLY VERTICALLY STACKED FRIDAY THROUGH THE REST OF THE WEEKEND. THIS WILL LEAVE CHANCES FOR RAIN SHOWERS...TRANSITIONING TO A MIX OF RAIN AND SNOW SHOWERS AND EVENTUALLY JUST SNOW SHOWERS AND FLURRIES. AT THIS POINT...IT DOES NOT APPEAR THAT THESE SNOW SHOWERS WILL BE ENOUGH TO ACCUMULATE...BUT A DUSTING WOULD NOT BE OUT OF THE QUESTION WITH SOME OF THE MORE INTENSE SHOWERS. THE EXTENDED PERIOD WILL BEGIN OUT ON THE COLD SIDE ON MONDAY AS THE DEEP AND SPATIALLY WIDE TROUGH SLOWLY MOVES EASTWARD TOWARD THE ATLANTIC COAST. AS IT PROPAGATES EASTWARD...A RIDGE AXIS WILL PASS THROUGH THE REGION BY MIDWEEK AND START ADVECTING WARMER AIR BACK INTO THE AREA. THERE IS SOME UNCERTAINTY IN THE DETAILS OF THE LONG TERM FORECAST...WHICH IS TYPICAL...BUT THE GENERAL TREND SEEMS TO BE POINTING TOWARD A NICE WARM UP BACK INTO THE 60S. HALBACH && .AVIATION... 06 UTC TAFS...MAIN CONCERN FOR THE OVERNIGHT HOURS WILL INITIALLY BE LINGERING TS CHANCES AND THEN TRANSITIONING OVER TO LOW CIGS/VIS BY THE PREDAWN HOURS. THE MAIN SURFACE LOW IS STILL WELL WEST OF THE AREA IN WESTERN IOWA. THE ASSOCIATED WARM FRONT IS MOVING NWD THROUGH NRN IL...AND AT ISSUANCE TIME IS JUST SOUTH OF THE TAF SITES. THERE IS A WEAKENING LINE OF TS MOVING THROUGH NCNTRL IL...BUT THESE STORMS SHOULD DISSIPATE BEFORE REACHING DPA/ORD/MDW. WHEN THE WARM FRONT PUSHES NORTH OF THE TAF SITES...WINDS WILL VEER MORE SELY AND WARM SECTOR AIR WILL OVERSPREAD NRN IL. THIS WILL KEEP A CHANCE OF TS OVER THE AREA FOR THE NEXT SEVERAL HOURS...BUT CHANCES WILL BE LOW AND ANY TS COVERAGE SHOULD BE ISOLATED OR SCATTERED AT BEST. THE EWD PROGRESSION OF THE COLD FRONT IS VERY SLOW...SO WILL DELAY THE ASSOCIATED WIND SHIFT UNTIL EARLY AFTERNOON. THERE SHOULD BE SOME TEMPORARY IMPROVEMENT IN CIGS/VIS DURG THE LATE MORNING AND EARLY AFTERNOON...BUT FOLLOWING THE COLD FRONTAL PASSAGE...CIGS WILL DROP THROUGH MVFR THROUGH THE AFTERNOON TO...ULTIMATELY IFR LATE IN THE PERIOD AS COLD AIR FILTERS IN BEHIND THE FRONT. KREIN && .MARINE... 300 AM CDT STRONG LOW PRESSURE WILL MOVE SLOWLY NORTHEAST ACROSS IOWA AND SOUTHERN WISCONSIN TODAY WHILE STRONG HIGH PRESSURE REMAINS OVER EASTERN CANADA. THIS WILL KEEP GALE FORCE WINDS OVER THE NORTHERN PORTIONS OF THE LAKE TODAY...BUT AS THE LOW GRADUALLY FILLS...THE GALES WILL SUBSIDE THIS EVENING. THE LOW WILL CONTINUE TO SLOWLY MOVE EAST AS A RIDGE OF HIGH PRESSURE BUILDS OVER THE CENTRAL PLAINS SATURDAY AND SUNDAY. THE HIGH PRESSURE IS EXPECTED TO CONTINUE TO BUILD EAST OVER THE UPPER MIDWEST AND WESTERN GREAT LAKES MONDAY AND TUESDAY. && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 215 AM CDT FRI APR 11 2008 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 112115- WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE- DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON- IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON- 215 AM CDT FRI APR 11 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. PORTIONS OF THE PECATONICA...ROCK...DES PLAINES...FOX...AND KANKAKEE RIVERS WILL REMAIN IN FLOOD THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. PORTIONS OF THE PECATONICA...ROCK...DES PLAINES...FOX...AND KANKAKEE RIVERS WILL REMAIN IN FLOOD THROUGH EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTERS WILL NOT BE NEEDED. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-112115- WINTHROP HARBOR TO WILMETTE HARBOR- WILMETTE HARBOR TO NORTHERLY ISLAND- NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY- GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY- 215 AM CDT FRI APR 11 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. GALE FORCE WINDS TO 35 KNOTS ARE LIKELY TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-112115- LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NM OFFSHORE- LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI- LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM TOW RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO MID LAKE- 215 AM CDT FRI APR 11 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. GALE FORCE WINDS TO 40 KNOTS ARE LIKELY TONIGHT ACROSS ALL OF THE OPEN WATERS OF LAKE MICHIGAN. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. GALE FORCE WINDS TO 40 KNOTS ARE LIKELY THROUGH FRIDAY EVENING ACROSS ALL OF THE OPEN WATERS OF LAKE MICHIGAN. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
One to two feet of standing water was reported at Edgemere Terrace.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2008Every state in 2008This day in weather historyWarnings in Illinois, April 2008
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 87548.