3 thunderstorm wind, 1 lightning, 1 strong wind, 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 Jul 20, 2:50 AM CST, 2 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 350 AM CDT FRI JUL 20 2006 .DISCUSSION FOR MORNING GRIDS/ZONES... 350 AM CDT NOT A LOT OF ADJUSTMENTS MADE TO INHERITED FCST. SATLT LOOPS SHOW MID LVL VORT MAX DIGGING SEWD ACRS ERN DAKS ERLY THIS MRNG. SYS WILL BE ENCOUNTERING MORE STABLE AMS AS IT HEADS TWD UPR MS VLY AND WRN GRTLKS TDY SO EXPECT MID LVL CLOUD DECK TO CONTINUE TO OVERSPREAD AREA THIS MRNG...BUT WILL KEEP POPS JUST BLO MENTION WITH BEST CHC FOR SHWRS STAYING S OF FA IN AREA WHERE DEEPER LLVL MOISTURE MAY LINGER INTO THIS AFTN. OVER MOST OF RGN...SFC DEW POINTS STILL IN MID 60S-LWR 70S ACROSS AREA WILL BEGIN TO FALL OFF MORE STEADILY AS LLVL NELY FLOW INCRSS...AND VORT MAX DROPS INTO LWR OH VLY BY THIS EVENING. AS UPR SYS SHIFTS OFF TO E CLOUDINESS SHOULD DCRS TNGT. PLEASANT NLY FLOW ACRS GRTLKS TO CONT SAT WITH MORE SUNSHINE EXPECTED AS HI PRES BUILDS ACRS MID/UPR MS VLY. NXT POTL FOR RAINFALL LOOKS LIKE SUN NGT AS ANOTHER SHRT WAVE DIGS ACRS UPR GRTLKS...EMBEDDED IN LARGER SCALE NWLY FLOW. THIS DISTURBANCE HOLDS BETTER PROMISE FOR SOME CONVECTION THAN ITS PREDECESSOR AS MODEST LLVL WAA IS FCST AHD OF MID LVL TROF AXIS. BEST DYNAMICS WITH THIS SYS FCST TO BE N OF FA BUT WILL KEEP CHC POPS GOING OVR NRN PORTION OF FA DUE TO WARM ADVECTION. H5 FLOW TO FLATTEN OUT SOMEWHAT THRU FIRST PART OF UPCOMING WEEK SO RETURN TO MORE SUMMERLIKE TEMPS AND GRDL INCRS IN HUMIDITY EXPECTED. CURRENT GFS RUN BRINGS ANOTHER SLOW MOVG COLD FRONT INTO RGN WED-WED NGT SO WILL HAVE ANOTHER PERIOD OF CHC POPS AT THAT TIME. MOS TEMPS LOOK GOOD AND FAVOR SOMEWHAT WARMER MAV NUMBERS. MERZLOCK && .AVIATION DISCUSSION FOR 06Z TAFS...UPDATE 330AM CDT UPDATE...VISIBILITIES ARE DROPPING A LITTLE MORE THAN PREVIOUSLY EXPECTED AS WINDS HAVE GONE LGT/VRBL AT MANY LOCATIONS. MORE WIDESPREAD IFR VSBY HAS DEVELOPED ACROSS THE REGION AND DPA HAS DROPPED TO IFR...AND RFD HAS DROPPED TO 3SM. WHILE MDW/ORD REMAIN AT 5SM FOR NOW...THEY MAY DROP TO 3-4SM BEFORE SUNRISE. RFD WILL LIKELY DROP BELOW 3SM AS WELL. VSBY IS STILL EXPECTED TO IMPROVE TO VFR BY 13Z. THE REMAINDER OF THE TAF PERIOD SHOULD BE QUIET WITH ONLY BKN-OVC MID AND HIGH LEVEL CLOUDINESS. KREIN && .LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...SCA LT TNGT THRU SAT MRNG IL AND IN NEARSHORE WATERS. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 535 AM CDT THU JUL 20 2006 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-210930- 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- 535 AM CDT THU JUL 20 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... TODAY AND TONIGHT A THUNDERSTORM COMPLEX WILL CONTINUE TO MOVE ACROSS NORTH CENTRAL ILLINOIS...NORTHEAST ILLINOIS...AND NORTHWEST INDIANA THIS MORNING. ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE THIS MORNING WITH THE MAIN THREATS BEING DAMAGING WINDS. THE THUNDERSTORMS MAY ALSO PRODUCE SOME VERY HEAVY RAINFALL WHICH MAY LEAD TO SOME LOCALIZED MINOR FLOODING AND PONDING ON ROADWAYS. ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON...ESPECIALLY SOUTH OF INTERSTATE 80. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON SOUTH OF INTERSTATE 80 WITH THE MAIN THREATS BEING LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS MORNING AND AFTERNOON. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-210930- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 535 AM CDT THU JUL 20 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TODAY AND TONIGHT STRONG THUNDERSTORMS WITH WIND GUSTS IN EXCESS OF 50 KNOTS WILL MOVE ACROSS SOUTHERN LAKE MICHIGAN THIS MORNING. SOME HAIL IS ALSO POSSIBLE. THE THREAT OF THUNDERSTORMS WILL DIMINISH THIS AFTERNOON. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY SMALL CRAFT ADVISORY CONDITIONS ARE POSSIBLE FROM LATE TONIGHT THROUGH LATE FRIDAY NIGHT. NORTH WINDS WILL INCREASE TO 15 TO 20 KNOTS THIS EVENING. WAVES WILL BUILD TO 4 TO 6 FEET TONIGHT...SUBSIDING TO 2 TO 4 FEET BY LATE FRIDAY NIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
349 AM CDT THU JUL 20 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0341 AM TSTM WND DMG 5 W ROCKTON 42.45N 89.17W
07/20/2006 WINNEBAGO IL LAW ENFORCEMENT
TREE DAMAGE IN SHIRLAND
&&
HALBACHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
412 AM CDT THU JUL 20 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0408 AM TSTM WND DMG SE ROSCOE 42.42N 89.01W
07/20/2006 WINNEBAGO IL TRAINED SPOTTER
8 INCH BRANCH DOWN AT ELEVATOR ROAD AND DOOR ROAD
SOUTHEAST OF ROSCOE
&&
HALBACHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
421 AM CDT THU JUL 20 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0355 AM TSTM WND DMG SW ROCKFORD 42.27N 89.06W
07/20/2006 WINNEBAGO IL AMATEUR RADIO
ELECTRIC LINES DOWN ON PELLEY ROAD SOUTHWEST OF ROCKFORD
&&
HALBACHThe Chicago radar (KLOT), 61 km away, was scanning. The volume nearest the first event began at 16:23 UTC.
3 thunderstorm wind, 1 lightning, 1 strong wind. Local standard time, as filed.
A home near 48th Place and Whitcomb Street in Calumet Township was struck by lightning, which started a fire on the second floor. Two bedrooms, a bathroom and the attic were gutted.
Medium size tree branches were blown down near 173rd and Indianapolis Blvd.
Several buildings were damaged along Broadway Street. A roof was lifted off part of one building. Two steel garage doors were pushed in on another building. An awning and two signs were blown down. Other buildings suffered minor damage. A guard shack was blown over. An 18 year old woman in the shack suffered knee and shoulder injuries.
A field house under construction in Hobart was struck by lightning, then blown down by strong winds. The damaged steel frame was in ruins and will set the project back at least 6 months.
Small trees were uprooted and large limbs were blown down near County Road 325 and County Road 400.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2006Every state in 2006This day in weather historyWarnings in Indiana, July 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: 5519462, 5519460, 5519459, 5519463, 5519461.