7 thunderstorm wind, 3 lightning, 1 hail, as filed by the National Weather Service.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 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 Aug 2, 6:00 PM CST, 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 700 PM CDT WED AUG 2 2006 .DISCUSSION FOR AFTERNOON GRIDS/ZONES... 250 PM CDT ACROSS THE REGION...SKIES HAVE CLEARED WITH THE EDGE OF DENSE CI RETREATING NORTH INTO WISCONSIN. THIS IS ALLOWING EVEN GREATER INSOLATION ACROSS THE REGION AND COMBINED WITH COPIOUS AMOUNTS OF LOW LEVEL MOISTURE...THE ENVIRONMENT IS PRIMED FOR POTENTIAL SEVERE WEATHER DEVELOPMENT. LATEST SFC MESOANALYSIS IS INDICATING SB CAPE ON THE ORDER OF 3000-4000 J/KG AND LI OF -7 TO -9. HOWEVER THERE IS STILL A LITTLE CONVECTIVE INHIBITION...SO CNVTV DEVELOPMENT IS LIKELY TO BEGIN WITHIN THE NEXT FEW HOURS. BASED ON LATEST SFC ANALYSIS AND SATELLITE TRENDS...GOING WITH THE SLOWER MODEL SOLUTION FOR THE PROGRESSION OF THE SFC FRONT WAS THE WAY TO GO...BUT IT IS EVEN SLOWER THAN ADVERTISED ON LAST NIGHTS NAM/WRF RUN. THE 12Z NAM/WRF IS STILL A BIT SLOWER THAN THE GFS...SO HAVE TRENDED CLOSER TO THIS SOLUTION FOR THE SHORT TERM. THE NAM/WRF IS NOW INDICATING THAT THE SFC FNT WILL MOVE INTO NWRN IL BY AROUND 00Z AND REACHING NWRN INDIANA SHORTLY BEFORE MIDNIGHT. WITH MOST OF THE ACTIVITY EXPECTED IN ADVANCE OF THE FRONT...TIMING IS STILL FAVORABLE FOR SVR WX. WITH LIMITED DIRECTIONAL SHEAR THROUGH THE LOWER AND MID LEVELS...THE MAIN THREAT IS DAMAGING WIND WITH STORMS DEVELOPING INTO SHORT LINES AND BOW ECHOES. PRECIPITABLE WATER VALUES ARE FORECAST TO BE IN EXCESS OF 2 INCHES THIS EVENING AND OVER NIGHT...SO HEAVY RAINFALL AND FLOODING WILL BE POSSIBLE...ESPECIALLY IN AREAS OF ECHO TRAINING. HAVE NOT MADE ANY SIGNIFICANT CHANGE TO THE GOING LONG TERM FORECAST. FOR THE LOCAL AREA...HAVE TRENDED TOWARDS THE NCEP MANUAL GUIDANCE. THE ONLY CHANGE WAS TO ADD CHANCE POPS FOR SUNDAY NIGHT AND MONDAY...BUT CONFIDENCE IS LOW SINCE THE GFS HAS BEEN INCONSISTENT AT THIS TIME RANGE FOR THE PREVIOUS FEW MODEL RUNS. THE MAIN IDEA TO NOTE IS THAT FOLLOWING THE FROPA AND CONVECTIVE ACTIVITY TONIGHT...THE REGION SHOULD SEE SIGNIFICANTLY LOWER TEMPS FOR THE NEXT COUPLE DAYS...WITH HIGHS ONLY REACHING THE LOW 80S THURSDAY. TEMPS WILL SLOWLY REBOUND TO THE MIDDLE 80S FRIDAY AND THE UPPER 80S TO NEAR 90 OVER THE WEEKEND...WITH SEASONABLE TEMPERATURES CONTINUING THROUGH EARLY NEXT WEEK. KREIN && .AVIATION... 00Z TAFS...MAIN CONCERN IS CONVECTION FIRST FEW HRS OF THE TAFS. BROKEN LINE OF TS EXTENDS FROM UGN TO DKB. EXPECT THIS ACTIVITY TO CONTINUE PUSHING EAST ACROSS NE IL AHEAD OF PREFRONTAL BOUNDARY ON WHICH IT IS FIRING ON. TEMPS QUITE A BIT COOLER BEHIND THIS LINE BUT DEWPOINTS STILL IN THE LOWER 70S. MAIN FRONT STILL EXTENDS ACROSS SOUTH CENTRAL WI BACK INTO NE IA. A SHORTWAVE RIDES ACROSS MO AND CENTRAL IL LATER TONIGHT INTO THURS MORNING. WITH AN EXTENSIVE CLOUD SHIELD MOVING IN FROM THE WEST AND LOSS OF DAYTIME HEATING... CURRENT ACTIVITY SHOULD DIMINISH SOME AFTER SUNSET. FRONT PUSHES SOUTH ACROSS THE TERMINALS LATER THIS EVENING AND MAY BE ENHANCED OFF LAKE MICHIGAN AT ORD/MDW/GYY. MODELS CONTINUE TO INDICATE LOW MVFR CIGS WITH COOLER NE FLOW IN VERY MOIST ATMOSPHERE. CIGS MAYBE AS LOW AS IFR ALONG THE LAKESHORE. THESE LOW CLOUDS SHOULD LIFT AND SCATTER OUT QUICKLY THURS MORNING. WSW WINDS WILL GRADUALLY BECOME NW THIS EVENING THEN SHIFT NORTH BEHIND FROPA...STAYING NE OVERNIGHT AND THURSDAY. && .LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 715 PM CDT WED AUG 2 2006 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-030930- WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-BENTON- 715 PM CDT WED AUG 2 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE OUTLOOK AREA THIS EVENING. THUNDERSTORMS HAVE DEVELOPED ACROSS NORTHERN ILLINOIS ALONG AND JUST AHEAD OF AN APPROACHING COLD FRONT. THUNDERSTORMS WILL SPREAD SOUTHEAST ACROSS NORTHEAST ILLINOIS AND NORTHWEST INDIANA THIS EVENING AS THE FRONT CONTINUES TO SAG ACROSS THE OUTLOOK AREA. DAMAGING WINDS AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH THESE STORMS. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY...GENERALLY ALONG AND SOUTH OF A LINE FROM BLOOMINGTON ILLINOIS TO RENSSELAER INDIANA. THE MAIN SEVERE WEATHER THREAT IS EXPECTED TO BE DAMAGING WINDS...AS WELL AS LOCALLY HEAVY RAINFALL. SCATTERED THUNDERSTORMS ARE POSSIBLE ACROSS THE NORTHERN PARTS OF THE OUTLOOK AREA ESPECIALLY DURING THE MORNING HOURS...BUT WIDESPREAD OR ORGANIZED SEVERE WEATHER IS EXPECTED NORTH OF THE COLD FRONT. THERE IS ANOTHER CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY LATE THIS AFTERNOON AND THIS EVENING. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-030930- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 715 PM CDT WED AUG 2 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TONIGHT THERE IS A SLIGHT RISK OF SEVERE STORMS ACROSS SOUTHERN LAKE MICHIGAN THIS EVENING. SCATTERED THUNDERSTORMS WILL CONTINUE TO SPREAD SOUTHEAST ACROSS SOUTHERN LAKE MICHIGAN THROUGH THIS EVENING. DAMAGING WINDS ARE THE MAIN THREAT WITH THESE STORMS. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY SMALL CRAFT ADVISORY CONDITIONS MAY DEVELOP THURSDAY AS NORTH WINDS GUST TO NEAR 20 KNOTS...WITH WAVES UP TO 5 FEET. WINDS AND WAVES WILL DECREASE THURSDAY EVENING. SCATTERED THUNDERSTORMS ARE POSSIBLE INTO THURSDAY ACROSS SOUTHERN LAKE MICHIGAN...MAINLY DURING THE MORNING HOURS. THERE IS ANOTHER CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND MONDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) RATZER
The Chicago radar (KLOT), 23 km away, was scanning. The volume nearest the first event began at 00:23 UTC.
7 thunderstorm wind, 3 lightning, 1 hail. Local standard time, as filed.
Several trees were blown down, some on homes, mainly on the north side of Brookfield. Power lines were also blown down.
A 500 foot to 1,000 foot wide path of tree damage was reported through much of Riverside. Power lines were also blown down.
Tree damage was reported throughout North Riverside. A tree was uprooted on Fifth Avenue and half of another tree came down on 12th Avenue. Power lines were also blown down.
Tree damage was reported throughout much of Lyons. Power lines were blown down. A tree fell onto a house on Prescott Avenue, but did not damage the house.
Penny size hail fell at Matthiessen State Park.
A gust to 60 mph was estimated along Ridge Road in southeast Kendall County.
Trees were blown down at Route 30 and Wolf Road.
A house was struck by lightning on the northwest side of Chicago. A young girl was watching TV and was taken to the hospital with numbness in her arm. A few blocks away, another bolt of lightning struck a hair salon and knocked down part of the facade.
Eight to ten trees were blown down on 216th Street blocking the road. Several tree limbs and power lines were blown down near 216th Street and Governors Highway.
A house was struck by lightning on the west side of Chicago. The surge blew out some appliances.
A house was struck by lightning which started a fire in the attic. The lightning struck the chimney, knocking part of it down. A woman washing her face felt a shock in her arm but suffered no serious injuries.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2006Every state in 2006This day in weather historyWarnings in Illinois, August 2006
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: 5525344, 5525342, 5525343, 5525345, 5526218, 5526219, 5526220, 5526223, 5526221, 5526222, 5526224.