Strong to severe thunderstorms moved across parts of northern Illinois during the evening hours of July 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.
Strong to severe thunderstorms moved across parts of northern Illinois during the evening hours of July 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 Jul 11, 5:48 PM CST, 1 hour 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 648 PM CDT SUN JUL 11 2010 .DISCUSSION... 257 PM CDT MAIN FORECAST DILEMMA THIS GO AROUND INVOLVES POPS AND TIMING OF PRECIP. HAVE BASED MUCH OF FIRST PERIOD FCST ON CURRENT SATELLITE TRENDS THAT SHOW SVR MCS OVER CENTRAL MO CONTINUING TO PROPAGATE SEED. THIS SHOULD LIMIT DEVELOPMENT FURTHER NORTH AND IS IN GOOD AGREEMENT WITH MODEL FORECASTS THAT SUGGEST MUCH BETTER LOW LEVEL FORCING WILL FOCUS ON SEN IL AND EVENTUALLY THE LR OH VALLEY BY LATE TONIGHT. NONETHELESS...WILL MAINTAIN LIKELY MENTION OF PRECIS ACROSS FA GIVEN PROXIMITY OF SHOWER BAND NOW MOVING ACROSS NW AND W CENTRAL IL. INSTABILITY HAS BEEN LIMITED BY HIGH LEVEL CLOUDINESS BUT HAS BECOME SUFFICIENT ENOUGH TO POP SOME ISOLATED SHOWERS OVER SEN AND SE RN PORTIONS OF FA. SHOWERS AND A FEW THUNDERSTORMS MAY PERSIST THROUGH MONDAY MORNING...BUT BETTER CHANCES FOR THUNDER APPEAR TO DEVELOP MONDAY AFTERNOON AS DIFFUSE FRONTAL BOUNDARY SAGS SOUTHWARD ACROSS AREA. THIS BOUNDARY WILL BE ACTING ON A POOL OF RESIDUAL LOW LEVEL MOISTURE WITH AFC DEW POINTS FORECAST TO HOVER IN UPPER 60S INTO THE EARLY AFTERNOON. THIS IS TO YIELD MODEST CAPE NUMBERS. IN ADDITION...SECONDARY SHORT WAVE NOW DROPPING SEWD ACROSS ERN MT AND WY...IS FORECAST TO BEGIN TO AFFECT AREAS E OF MS RVR BY MONDAY AFTERNOON. AS A RESULT...WILL MAINTAIN CHC MENTION OF THUNDER MOST AREAS THROUGH MONDAY. AREA TO CLEAR OUT AFTER THIS MID LEVEL TROF HEAD OFF TO THE EAST...ALLOWING SFC BOUNDARY TO PUSH WELL SOUTH OF FA. RIDGING IN WAKE OF MONDAYS SYSTEM SHOULD LIMIT ANY DEVELOPMENT ON TUESDAY...DESPITE ABOUT 1000 JOULES OF CAPE AND LITTLE OR NO CIN. CONSIDERING VERY WEAK WIND PROFILES AND STABILIZING EFFECT OF EASTERLY FLOW OFF LAKE MI...WILL LIMIT CHC POPS TO E CNTRL IL AND NWRN INDIANA. WEDNESDAY LOOKS LIKE A REAL WARM DAY AS SFC RIDGE HEADS OFF TO THE EAST AND MID LVL RIDGING ALLOWS FOR COMPRESSIONAL WARMING TO ACT ON 20 DEG C H85 TEMPERATURES. LITTLE CHANGE TO DAYS 5-7 PERIOD. OVERALL TREND OF ABOVE NORMAL TEMPS TO CONTINUE AS RATHER STRONG WX SYSTEM MOVES ACROSS SRN CANADA WED NIGHT-THURSDAY...ENHANCING WSWLY LOW LEVEL FLOW INTO MIDWEST. COLD FRONT ASSD WITH THIS SYSTEM IS FORECAST TO MOVE THROUGH THUR-THUR NIGHT PERIOD SO KEEP CHC POPS GOING. MERZLOCK && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 00Z... MAIN CONCERNS ARE TRENDS/TIMING OF PRECIP AND THUNDER POTENTIAL THROUGH PERIOD...AND RELATED CONCERNS OF CIGS/VIS. RATZER //DISCUSSION...UPDATED 00Z... SFC COLD FRONT STRETCHES FROM WESTERN LAKE SUPERIOR THROUGH SWRN MN/IA EARLY THIS EVENING. VIGOROUS MID LEVEL WAVE MOVING THROUGH MID/UPPER MS VALLEY HELPING TO PRODUCE AREA OF RW/TRW AHEAD OF THE SFC FRONT ACROSS NRN IL/WI. MODEST AXIS OF UNSTABLE AIR IN PLACE ACROSS NORTHERN IL AHEAD OF APPROACHING WAVE...THOUGH INSTABILITY AND DEEP LAYER SHEAR MORE FAVORABLE TO THE SOUTH ACROSS CENTRAL IL. RW/TRW NOW OVER NRN IL EXPECTED TO SPREAD EAST ACROSS TERMINALS EARLY THIS EVENING AS MID LEVEL WAVE PROPAGATES THROUGH AREA. VIS SATELLITE INDICATES CLEARING WEST OF MS RIVER...LIKELY A SIGN OF SUBSIDENT AIR BEHIND MID LEVEL VORT. ADDITIONAL TRW HAVE BEEN DEVELOPING CLOSER TO SFC COLD FRONT FROM NORTHERN IA TO NORTHERN WI...THOUGH AVAILABLE MODEL GUIDANCE INCLUDING 4 KM WRF AND HIGH RES RUC ALL SUGGEST THIS ACTIVITY SHOULD DECREASE AFTER SUNSET AND LOSS OF DIURNAL INSTABILITY. THEREFORE HAVE FOCUSED PRECIP/THUNDER THREAT FOR TAFS DURING NEXT FEW HOURS...WITH REMAINDER OF OVERNIGHT HOURS DRY. SOME REDEVELOPMENT OF RW NOT COMPLETELY OUT OF THE QUESTION WITH UPPER TROUGH MOVING OVERHEAD DURG THE OVERNIGHT HOURS...THOUGH CONFIDENCE RATHER LOW IN THAT OCCURRING. SYNOPTIC GRADIENT WILL SUPPORT LGT SSW WINDS...THOUGH MAY SEE VARIABLE WINDS BRIEFLY IN AND NEAR TRW. HAVE ALSO ADDED A VFR HZ MENTION AS SOUTH WINDS BECOME LGT/VRBL IN SFC TROUGH AXIS AFTER MIDNIGHT WITH MOIST LLVLS/WET GROUND. FOR MONDAY...APPEARS WINDS WILL SHIFT TO THE NORTH/NORTHWEST ACROSS NRN IL DURG THE MORNING...BECOMING MORE NORTHEAST BY AFTN AS SFC HIGH PRESSURE BUILDS ACROSS NORTHERN LAKES. HAVE MAINTAINED VCSH MENTION DURG MORNING HOURS FROM PREVIOUS FORECAST AS MODELS CONTINUE TO INDICATE DEVELOPMENT OF RW/TRW...THOUGH CONFIDENCE VERY LOW IN SIGNIFICANT PRECIP THREAT BY MONDAY AFTERNOON. RATZER //ORD AND MDW CONFIDENCE...UPDATED 00Z... MEDIUM CONFIDENCE IN TSRA/PRECIP FCST AND TRENDS. LOW CONFIDENCE IN HAZE OR MVFR CIG POTENTIAL LATE TONIGHT AND EARLY MONDAY. MEDIUM CONFIDENCE MOST OTHER FORECAST ELEMENTS. RATZER //OUTLOOK FOR ORD/MDW FOR 06Z TUESDAY-12Z SATURDAY...UPDATED 18Z... MONDAY NIGHT...VFR. TUESDAY...CHANCE OF AFTERNOON SHRA/TSRA...OTHERWISE VFR. WEDNESDAY...VFR. CHANCE OF SHRA/TSRA LATE WEDNESDAY NIGHT. THURSDAY...CHANCE OF MORNING SHRA/TSRA. WIND SHIFT/COLD FRONT. FRIDAY...VFR. SATURDAY...CHANCE OF SHRA/TSRA...OTHERWISE VFR. CMS && .MARINE... 205 PM...A COLD FRONT EXTENDING FROM ONTARIO SOUTHWEST INTO THE CENTRAL PLAINS WILL MOVE SOUTHEAST ACROSS NORTHERN LAKE MICHIGAN LATE TONIGHT AND THEN ACROSS SOUTHERN LAKE MICHIGAN MONDAY MORNING. A NEW AREA OF LOW PRESSURE IS EXPECTED TO DEVELOP ALONG THIS FRONT OVER CENTRAL IL TONIGHT AND MOVE EAST MONDAY. THIS NEW LOW WILL LIKELY CAUSE THE COLD FRONT TO SLOW MONDAY MORNING. WIND SPEEDS AND DIRECTION WILL BE HIGHLY DEPENDENT ON THE STRENGTH AND TRACK OF THIS LOW. WINDS EVENTUALLY SHOULD BECOME NORTHERLY BY MONDAY AFTERNOON WITH SPEEDS 10-20KTS. AN AREA OF WEAK HIGH PRESSURE WILL SETTLE ACROSS THE WESTERN LAKES TUESDAY INTO TUESDAY NIGHT. THIS WILL ALLOW WINDS TO BECOME LIGHT AND VRB BY WEDNESDAY MORNING. WINDS THEN TURN SOUTHEASTERLY THEN SOUTHERLY WEDNESDAY NIGHT AS A TROUGH OF LOW PRESSURE DEVELOPS OVER THE PLAINS. CMS && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 358 PM CDT SUN JUL 11 2010 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 122100- 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- 358 PM CDT SUN JUL 11 2010 /458 PM EDT SUN JUL 11 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. ISOLATED THUNDERSTORMS WILL CONTINUE EARLY THIS EVENING OVER AREAS SOUTH OF INTERSTATE 80. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. A MORE WIDESPREAD AREA OF SHOWERS AND THUNDERSTORMS NOW OVER NORTHWEST AND WEST CENTRAL ILLINOIS WILL BE OVERSPREADING NORTH CENTRAL ILLINOIS THIS EVENING...REACHING NORTHWEST INDIANA AFTER MIDNIGHT. THOUGH THESE STORMS ALSO ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. SHOWERS AND THUNDERSTORMS WILL LIKELY BE ONGOING ACROSS NORTHWEST INDIANA MONDAY MORNING. A WEAK COLD FRONT WILL BE PASSING THROUGH THE REGION ON MONDAY. SCATTERED SHOWERS AND THUNDERSTORMS MAY DEVELOP ALONG THIS BOUNDARY DURING THE AFTERNOON HOURS. AGAIN...NO SEVERE WEATHER IS EXPECTED. THERE IS ANOTHER CHANCE OF THUNDERSTORMS WEDNESDAY NIGHT INTO THURSDAY. .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>745-122100- 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- 358 PM CDT SUN JUL 11 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. THERE IS A CHANCE OF THUNDERSTORMS THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THERE IS A CHANCE OF THUNDERSTORMS MONDAY...AND AGAIN WEDNESDAY NIGHT AND THURSDAY. && 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- 870-872-874-876-878-122100- 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- 358 PM CDT SUN JUL 11 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THERE IS A CHANCE OF THUNDERSTORMS MONDAY...AND AGAIN WEDNESDAY NIGHT AND THURSDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO MERZLOCK
The Chicago radar (KLOT), 35 km away, was scanning. The volume nearest the first event began at 01:09 UTC.
2 lightning, 1 thunderstorm wind. Local standard time, as filed.
Lightning struck a utility pole on Church Street. Wires and a ceramic insulator fell off the pole and onto a car, smashing both the front and back windows.
Tree limbs and power lines were blown down along and south of Pine Bluff Road west of Route 47. A tree 6 to 8 inches in diameter was also blown down.
Lightning struck a house on North Hickory Street and started a fire in a dormer. While the fire was contained in the dormer, the house suffered smoke and water damage throughout the house.
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, July 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: 254452, 249094, 249096.