1 flood, 1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 2 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 10, 2:00 PM CST, 3 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 300 PM CDT THU AUG 10 2006 .DISCUSSION FOR MORNING GRIDS/ZONES... 300 PM CDT WITH ACTIVE SEVERE WEATHER MUCH OF THE SHIFT...NOT A LOT OF TIME TO POUR OVER THE GUIDANCE. THUS...NOT A LOT OF CHANGE TO THE GOING FORECAST. FORTUNATELY...NOT A LOT OF CHANGE WAS REQUIRED TO THE INHERITED FORECAST FOR THE SHORT TERM. HAVE ONLY TWEAKED THE PCPN/POPS FOR THE NEXT 24HRS TO REFLECT A BETTER HANDLE ON THE TIMING AND PATH OF INDIVIDUAL SHORT WAVES TRAVERSING THE HIGH AMPLITUDE UPPER FLOW. THE 12Z GFS RUN IS CONTAMINATED BY CONVECTIVE FEEDBACK AGAIN SO HAS LARGELY BEEN DISCARDED FOR THE SHORT TERM...BUT THE NAM/WFF SEEMS TO AT LEAST HAVE A DECENT HANDLE ON 2 SGFNT SHORT WAVES WHICH WILL IMPACT THE LOCAL WEATHER THROUGH FRIDAY. ONE SHORT WAVE...WELL INITIALIZED BY THE NAM AND SEEN IN THE SATELLITE IMAGERY OVER MINNESOTA WILL TRACK SEWD WHILE ANOTHER IS OVER IOWA. THESE 2 WAVES...PARTICULARLY THE SRN MOST WAVE WILL KEEP PCPN CHANCES OVER THE CWA TONIGHT...AND HAVE UPPED POPS TO LIKELY FOR THE SRN PORTIONS OF THE CWA. THE NRN PORTIONS WILL BE MORE REMOVED FROM THE STRONGER DYNAMICS...BUT CONTINUED SCT SHRA ACTIVITY IS EXPECTED OVERNIGHT. BUT SINCE THE AIRMASS IS WELL WORKED OVER...DO NOT EXPECT MUCH THUNDER...BUT HAVE NOT REMOVED TS FROM THE GRIDS GIVEN RELATIVELY DECENT UPPER DYNAMICS. FOR THE LONGER TERM...HAVE CONTINUED THE TREND OF COOLER THAN NORMAL TEMPS AS HIGH PRESSURE IN THE FORM OF A CONTINENTAL POLAR AIRMASS SETTLES OVER THE GREAT LAKES AND BUILDS OVER THE UPPER MIDWEST. THIS SHOULD QUICKLY SHUT OFF ANY PCPN CHANCES AND TEMPS WILL ONLY REACH INTO THE UPPER 70S FOR MANY LOCATIONS ON FRIDAY AND SATURDAY. BY SUNDAY... THE HIGH PRESSURE WILL SLIDE OFF TO THE EAST AND A SLY RETURN FLOW WILL SET UP...AND TEMPS WILL QUICKLY RETURN TO MORE SUMMER-LIKE LEVELS. BY MONDAY...AN UPPER TROF AND ASSOCIATED SFC FNT WILL APPROACH THE REGION BRINGING THE NEXT CHANCE FOR SH/TSRA. KREIN && .AVIATION DISCUSSION REGARDING 18Z TAFS... 105 PM CDT MAIN AVIATION FOCUS ON CIG/VIS TRENDS THROUGH TONIGHT...AS WELL AS LINGERING PRECIP POTENTIAL. VIGOROUS MCS PUSHED SOUTH OF TERMINALS THIS MORNING...WITH LINGERING PATCHY WEAK CONVECTION AND STRATIFORM PCPN ACROSS IA/NRN IL/NRN IND EARLY THIS AFTN. PROFILER/WATER VAPOR DATA INDICATE SHORT WAVE TROUGH ACROSS MN/IA...WHICH CONTINUES TO FORCE NEW SHRA DEVELOPMENT IN VERY MOIST LLVL AIRMASS ACROSS FCST AREA THIS AFTN. NAM/RUC MID LEVEL LAPSE RATES APPEAR MARGINAL FOR WIDESPREAD THUNDER THREAT...SO HAVE LIMITED MENTION TO -SHRA FOR THIS AFTERNOON ACROSS VARIOUS TERMINALS. APPEARS GREATER TSRA THREAT WILL REMAIN SOUTH INTO CNTRL/SRN IL WHERE INSTABILITY WILL BE SIGNIFICANTLY GREATER. MODEL TIME SECTIONS INDICATE CONTINUED WEAK UVM THROUGH TONIGHT AS SHORT WAVE TROUGH SLOWLY TRANSLATES ACROSS FCST AREA. COULD BE ADDITIONAL SPOTTY LIGHT PCPN...BUT GIVEN LACK OF WIDESPREAD PCPN FARTHER UPSTREAM ATTM WILL FOCUS MAINLY ON LOWER CIGS/VSBYS TNGT. WRF/NAM FCST SOUNDINGS AND TIME SECTIONS INDICATE LLVL MOISTURE LINGERING WITH COOL NELY LOW LEVEL FLOW MAINTAINING HIGH RH. STATISTICALLY GUIDANCE SUPPORTING MVFR CIGS THRU THE NGT...THOUGH SOUNDINGS SUGGEST POTENTIAL FOR CIGS BLO 1 KFT. FOR NOW WILL HINT WITH SCT008-010 FT LAYER AND BKN MVFR DECK AND 4-5SM VSBYS IN HZ/BR. DRIER LOW LEVEL ADVECTION FRI AS SFC HIGH BUILDS ACROSS LAKES SHOULD ALLOW IMPROVEMENT/SCT OF LOWER CIGS AND VSBY. AS FOR WINDS...SFC LOW PRESSURE PASSING ALONG FRONTAL BOUNDARY SOUTH OF TAF SITES THRU TNGT...AS SFC HIGH BUILDS SLOWLY SOUTHEAST FROM NORTHERN ONTARIO. THIS TO MAINTAIN PERIOD OF NELY FLOW WITH FCST SOUNDINGS INDICATING SOME GUSTINESS ESPECIALLY FRI IN 12-18KT RANGE. RATZER && .LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 430 PM CDT THU AUG 10 2006 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-111000- 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- 430 PM CDT THU AUG 10 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. SEVERE WEATHER IS NOT EXPECTED. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND MONDAY. SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-766-111000- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 430 PM CDT THU AUG 10 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT WAVES OF 4 TO 6 FEET WILL CREATE HAZARDOUS CONDITIONS FOR SMALL CRAFT TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY HAZARDOUS WAVE CONDITIONS FOR SMALL CRAFT WILL PERSIST INTO FRIDAY EVENING. THERE IS A CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND MONDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
227 PM CDT THU AUG 10 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0759 AM TSTM WND DMG E MENDOTA 41.55N 89.12W
08/10/2006 LA SALLE IL FIRE DEPT/RESCUE
2 AND 1/2 FOOT DIAMETER TREE DOWN. IT ALSO TOOK WIRES
DOWN.
0809 AM TSTM WND GST COMPTON 41.69N 89.09W
08/10/2006 E0.00 MPH LEE IL PUBLIC
WIND GUST 60 MPH
0809 AM TSTM WND DMG AMBOY 41.72N 89.33W
08/10/2006 LEE IL LAW ENFORCEMENT
TREES AND POWER LINES DOWN AND ESTIMATED WIND 60 TO 70
MPH
0810 AM TSTM WND DMG AMBOY 41.72N 89.33W
08/10/2006 LEE IL TRAINED SPOTTER
70 MPH WIND.1 MILE SOUTH OF AMBOY TOOK DOWN NUMEROUS
TREES AND BRANCHES.
0829 AM TSTM WND GST SANDWICH 41.65N 88.62W
08/10/2006 E62.00 MPH DEKALB IL TRAINED SPOTTER
62 MPH WIND.
0845 AM LIGHTNING GARDNER 41.19N 88.31W
08/10/2006 GRUNDY IL LAW ENFORCEMENT
LIGHTNING STRUCK A CAR AND BLEW OUT THE WINDOWS ON I-55
NEAR GARDNER. REPORT FROM DISTRICT 5 ILLINOIS STATE
POLICE.
0845 AM LIGHTNING MINOOKA 41.45N 88.26W
08/10/2006 GRUNDY IL LAW ENFORCEMENT
A CAR WAS HIT BY LIGHTNING ON I-80 NEAR MINOOKA. REPORTED
BY DISTRICT 5 ILLINOIS STATE POLICE.
0913 AM TSTM WND DMG WATSEKA 40.78N 87.73W
08/10/2006 IROQUOIS IL LAW ENFORCEMENT
TREE LIMBS DOWN ROUTE 1 NORTH WATSEKA BLOCKING ROAD.
REPORTED BY ILLINOIS STATE POLICE DISTRICT 21.
0915 AM LIGHTNING JOLIET 41.53N 88.12W
08/10/2006 WILL IL TRAINED SPOTTER
LIGHTNING STRUCK HOME ON MEADOWSEDGE LANE IN SPRINGWOOD
SUBDIVIISION IN JOLIET. ALSO LIGHTNING STRUCK TRANSFORMER
ON INGALLS AND WILLIAMS STREETS.
0916 AM TSTM WND DMG NW COAL CITY 41.29N 88.28W
08/10/2006 GRUNDY IL AMATEUR RADIO
NORTHWEST OF COAL CITY NEAR MCARDLE AND HIGGINS 14 INCH
TREE DOWN PARTIALLY BLOCKING HIGGINS. TREE NOT HEALTHY.
0918 AM TSTM WND DMG WATSEKA 40.78N 87.73W
08/10/2006 IROQUOIS IL AMATEUR RADIO
POWER LINES DOWN ILLINOIS ROUTE 1 NEAR 2200 NORTH ROAD.
BETWEEN WATSEKA AND MARTINTON.
0937 AM TSTM WND DMG 3 W MOROCCO 40.95N 87.51W
08/10/2006 NEWTON IN DEPT OF HIGHWAYS
TREE DOWN BLOCKING COUNTY ROAD NEAR WILLOW FLOUGH IN
NEWTON COUNTY.
1020 AM TSTM WND DMG CROWN POINT 41.42N 87.36W
08/10/2006 LAKE IN LAW ENFORCEMENT
POWER LINE DOWN IN CROWN POINT. REPORTED BY LAKE COUNTY
SHERIFF.
&&
THIS REPORT MAY UPDATED IF THERE ANY FUTHER REPORTS.
CMOTTThe Chicago radar (KLOT), 73 km away, was scanning. The volume nearest the first event began at 23:53 UTC.
1 flood, 1 flash flood. Local standard time, as filed.
Three to four inches of water was reported covering streets in Ottawa, where 1.49 inches of rain was measured.
Very heavy rain fell across parts of south central Cook County during the evening of August 10th. 1.80 inches of rain was measured in 75 minutes in La Grange from 630 pm to 745 pm, 2.28 inches of rain was mesured in 78 minutes in Burbank (3 miles southwest of Midway Airport) from 737 pm to 855 pm. Eight to fourteen inches of standing water was reported on La Grange Road between Plainfield Road and 55th Street in La Grange. Two to three feet of standing water closed the intersection of Archer Avenue and 63rd Street in Summit. Eight to ten inches of standing water was reported on Roberts Road between 79th and 87th Streets in Bridgeview. Storm total rainfall amounts included 2.38 inches at Burbank, 2.13 inches at LaGrange and 1.11 inches at Midway Airport. The Bridgeview Library suffered water damage in it's basement.
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: 5525510, 5525571.