Strong thunderstorms moved across parts of northern Illinois during the early morning hours of August 8th.
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.
Strong thunderstorms moved across parts of northern Illinois during the early morning hours of August 8th.
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 8, 3:58 AM CST, 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 458 AM CDT SUN AUG 8 2010 .DISCUSSION... 336 AM CDT TODAY AND TONIGHT...SHOWERS AND THUNDERSTORMS MAY DRIFT SOUTH INTO NORTH CENTRAL AND NORTHEAST ILLINOIS. THE 850 MB WARM AIR ADVECTION AND MOISTURE ADVECTION WAS STRONGEST IN WISCONSIN AT 00 UTC. THE LOCAL WRF MODEL IS SHOWING A GRADUAL SOUTH MOVEMENT OF THE 850 MB WIND MAXIMUM. THE RADAR SHOWS A SOUTHWARD MOVEMENT OF THE THUNDERSTORMS IN WISCONSIN SATELLITE LOOPS SHOW THE SAME. THE WARM AIR ADVECTION AND MOISTURE ADVECTION MAY INCREASE IN ILLINOIS. THE GFS MODELS SHOWS A LOW LEVEL INVERSION IN THE FORECAST SOUNDING FOR ROCKFORD BY 00 UTC. BUT THE CONVECTIVE AVAILABLE POT ENTAIL ENERGY IS STILL RATHER LARGE. WE WILL KEEP A CHANCE OF THUNDERSTORMS FOR THIS AFTERNOON THROUGH TUESDAY. WE WILL FOLLOW A NAM AND ECMWF SOLUTION. BECAUSE THE WARM AIR ADVECTION AND 850 MB JET STREAK POSITIONS THIS MORNING AND THOSE MODELS FORECASTS. WE WILL USE A COMBINATION OF MOS GUIDANCE AND MOS GUIDANCE FROM THE NAM FOR TEMPERATURE AND DEWPOINT FORECASTS. WILL MAKE LITTLE ADJUSTMENTS IN THE TEMPERATURE FORECASTS FOR TODAY THROUGH WEDNESDAY. THE HIGH TEMPERATURE MAY BE COOLER A LITTLE BUT NOT ENOUGH TO DECREASE THE FORECAST HIGHS. WE WILL BE ALERT FOR HEAT INDEX ADVISORY FOR MONDAY THROUGH WEDNESDAY. && .HYDROLOGY... 336 AM CDT THE THUNDERSTORMS THAT WILL BE OVER NORTHERN ILLINOIS TONIGHT THROUGH TUESDAY MAY PRODUCE HEAVY RAIN AND MAY BE AT SOME LOCATIONS FOR A LONG TIME. LOCAL FLOODING IS POSSIBLE MONDAY THROUGH WEDNESDAY IN NORTH CENTRAL ILLINOIS AND NORTHEAST ILLINOIS. && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 10Z... SECOND AFD UPDATE TO SCHEDULED 09Z AMMENDENTS...AS SITUATION IS BEING MONITORED FOR THE POTENTIAL OF CURRENT SHOWERS/THUNDERSTORMS IN WISCONSIN TO DROP SOUTH INTO NORTHERN ILLINOIS EARLY THIS MORNING. RODRIGUEZ //DISCUSSION...UPDATED 06Z... AS WAS EXPECTED...BEST COVERAGE FOR SHOWERS AND THUNDERSTORMS CONTINUES TO REMAIN TO THE NORTH OF THE TERMINALS WITH LATEST SATELLITE IMAGERY SHOWING CLEAR SKIES CURRENTLY OVERHEAD. THERE REMAINS SOME MID LEVEL MOISTURE THAT CONTINUES TO DRIFT SOUTHEAST OUT OF CENTRAL WISCONSIN AS WE REMAIN IN THE NORTHWEST FLOW PATTERN ALOFT. EXPECT CLEAR SKIES TO BE REPLACED WITH FEW TO SCATTERED MID CLOUD DECK BY EARLY SUNDAY. THEN DIURNAL CU DEVELOPS WITH BASES AROUND 5KFT BY MID DAY WITH UPPER LEVEL CIRRUS ALSO INCREASING. THESE LOW CLOUDS MAY STICK AROUND THROUGH THE EVENING HOURS ON SUNDAY AS A COMPLEX TO THE NORTH TRIES TO INCH ITS WAY SOUTH. CONFIDENCE IS LOW AT THIS TIME AS TO HOW FAR SOUTH THIS COMPLEX WILL SAG SOUTH...SO HAVE OPTED TO LEAVE OUT OF THE FORECAST AT THIS TIME. BUT THERE COULD BE SOME SHOWERS/THUNDERSTORMS AFTER THE 06Z TIME FRAME...AS MODERATE INSTABILITY WILL ALSO BE IN PLACE. WILL CONTINUE TO MONITOR TRENDS AND ADJUST WITH LATER FORECASTS. WINDS WILL REMAIN OUT OF THE SOUTHWEST THIS MORNING...MAINLY UNDER 10 KT. THEN WINDS BEGIN TO INCREASE OUT OF THE SOUTHWEST BY MID DAY SUNDAY WITH GUSTS AS HIGH AS 20...WITH BRIEF GUSTS OF A KNOT OR TWO HIGHER. WINDS BEGIN TO DIMINISH SUNDAY EVENING AS THE ATMOSPHERE DECOUPLES AND AS THE PRESSURE GRADIENT BEGINS TO RELAX. RODRIGUEZ //ORD AND MDW CONFIDENCE...UPDATED 10Z... SECOND AFD UPDATE TO SCHEDULED 09Z AMMENDENTS...HIGH CONFIDENCE WITH AN INCREASE IN BOTH LOW AND MID LEVEL CLOUD COVER EARLY THIS MORNING. LOW CONFIDENCE WITH THE POTENTIAL FOR SHOWERS AND THUNDERSTORMS...AND THE POTENTIAL FOR MVFR CONDITIONS EARLY THIS MORNING. RODRIGUEZ //OUTLOOK FOR ORD/MDW FOR 12Z MONDAY-12Z FRIDAY...UPDATED 06Z... MONDAY...VFR. CHANCE OF SHRA/TSRA. TUESDAY...VFR. CHANCE OF SHRA/TSRA. WEDNESDAY...VFR. CHANCE OF SHRA/TSRA. THURSDAY...VFR. FRIDAY...VFR. RODRIGUEZ && .MARINE... 320 AM CDT WITH HIGH PRESSURE SHIFTING OFF TO THE EAST AND A TROUGH OF LOW PRESSURE MOVING THROUGH PORTIONS OF THE NORTHERN PLAINS AND UPPER MIDWEST...A TIGHT PRESSURE GRADIENT REMAINS IN PLACE OVER THE LAKE WITH CURRENT WIND GUSTS IN THE 10 TO 20 KT RANGE. EXPECT THIS TO CONTINUE THROUGH SUNDAY WITH EVEN SOME HIGHER GUSTS POSSIBLE OVER THE LAKE AS THIS TROUGH OF LOW PRESSURE PROGRESSES THROUGH THE CENTRAL GREAT LAKES. IN TERMS OF THE NEARSHORE WATERS...STILL ANTICIPATE THE WINDS TO REMAIN IN THE 10 TO 20 RANGE TODAY. WITH THESE CONDITIONS IN PLACE...HAVE OPTED TO NOT ISSUE A SMALL CRAFT ADVISORY FOR TODAY. ALTHOUGH...IT WOULD NOT BE OUT OF THE QUESTION FOR A FEW BRIEF GUSTS TO 22 KT. THIS AREA OF LOW PRESSURE WILL QUICKLY EXIT THE REGION BY SUNDAY NIGHT...WITH WEAK HIGH PRESSURE SETTLING IN. THIS WILL HELP WINDS DIMINISH AND REMAIN THIS WAY THROUGH THE MIDDLE PART OF THE WEEK. RODRIGUEZ && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 342 PM CDT SAT AUG 7 2010 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 082045- 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- 342 PM CDT SAT AUG 7 2010 /442 PM EDT SAT AUG 7 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. PORTIONS OF THE FOX RIVER WILL REMAIN IN FLOOD. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. HEAT INDEX VALUES WILL LIKELY EXCEED 100 DEGREES FOR MUCH OR ALL OF THE OUTLOOK AREA FROM MONDAY THROUGH THURSDAY. HEAT INDICES MAY EXCEED 105 DEGREES FOR A FEW HOURS AROUND THE TIME OF MAXIMUM HEATING FOR SOME LOCATIONS FROM MONDAY THROUGH WEDNESDAY. THERE WILL BE A CHANCE OF THUNDERSTORMS...MAINLY NORTH OF INTERSTATE 88 FOR SUNDAY THROUGH TUESDAY. THERE WILL BE A CHANCE OF THUNDERSTORMS FOR LOCATION GENERALLY NORTH OF THE KANKAKEE AND ILLINOIS RIVERS ON WEDNESDAY. PORTIONS OF THE FOX RIVER WILL REMAIN IN FLOOD. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-082045- 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- 342 PM CDT SAT AUG 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS SUNDAY THROUGH THURSDAY NIGHT. && 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- 870-872-874-876-878-082045- 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 TWO 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- 342 PM CDT SAT AUG 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE WILL BE A CHANCE OF THUNDERSTORMS TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS SUNDAY THROUGH THURSDAY NIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO KREIN
The Chicago radar (KLOT), 70 km away, was scanning. The volume nearest the first event began at 10:02 UTC.
1 lightning. Local standard time, as filed.
A house on Lakeside Lane was struck by lightning which started a fire in the attic. The home was devastated by the fire.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2010Every state in 2010This day in weather historyWarnings in Illinois, August 2010
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: 258607.