A severe thunderstorm moved across northeast Illinois during the afternoon of September 5th.
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.
A severe thunderstorm moved across northeast Illinois during the afternoon of September 5th.
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 Sep 5, 2:30 PM CST, 1 hour 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 330 PM CDT WED SEP 5 2007 .DISCUSSION... 330 PM CDT BEYOND VERY SHORT TERM WITH TEMPS NEAR 90 AND DEW POINT IN THE MID-UPPER 60S ACROSS NORTHERN IL RESULTING IN ISOLATED DIURNAL SHRA/TSRA DEVELOPING AT MID AFTERNOON...FOCUS OF FORECAST IS ON INCREASING PRECIP CHANCES LATE TONIGHT INTO THU AS UPPER LOW ON THE EASTERN KS-OK BORDER LIFTS NORTHEASTWARD TO THE MID MS VALLEY WHILE WEAKENING...WITH CONTINUED THREAT THU NIGHT INTO FRI NIGHT AS CUT OFF UPPER LOW CENTERED OVER SOUTHERN ID OPENS AND GETS EJECTED ACROSS THE DAKOTAS AND INTO THE UPPER MIDWEST BY JET MAX PRESENTLY DIGGING ACROSS THE ALEUTIANS AS IT REACHES THE SOUTHERN B.C. COAST BY 00Z FRI. MODELS IN GOOD AGREEMENT IN SYNOPTIC SCALE FEATURES FOR NEXT FEW DAYS. AS WE GET INTO THE WEEKEND AND EARLIER NEXT WEEK STILL SOME TYPICAL UNCERTAINTY BUT GOOD CONSISTENCY SEEN IN GFS ENSEMBLE MEANS LAST FEW RUNS WITH GENERAL FORECAST IN LATER PERIODS BASED ON THIS OUTPUT. ISOLD-FEW SHRA/TSRA WILL DSPT WITH LOWERING SUN OF LATE THIS AFTERNOON-EARLY EVE WITH GRADUAL INCREASING CLOUDS LATER THIS EVE AS CENTRAL PLAINS LOW SLOWLY MOVES NE TO NRN MO OVERNIGHT. FORCING WEAK BUT WITH CONTINUED DEEPENING OF MOISTURE A FEW LIGHTER SHOWERS MAY WORK THEIR WAY ACROSS CENTRAL AND INTO PARTS OF NORTHERN IL DURING THE OVERNIGHT. THE SHORT WAVE THEN CONTINUES TO SW WI AND NORTHERN IL DURING THE DAY THU. WHILE WEAKENING...THE DEEPER MOISTURE AND PROXIMITY OF THE DISTURBANCE MAKES SHRA AND SOME TSRA LIKELY ACROSS THE AREA. AS WAVE SLOWLY CONTINUES INTO THE UPPER GREAT LAKES THU NIGHT POPS DROPPED BACK TO CHANCE CATEGORY. FOR FRI-FRI NIGHT SHORT WAVE AND ASSOCIATED SFC LOW MOVE ACROSS THE N WOODS AND LAKE SUPERIOR INTO ONTARIO WITH THE TRAILING COLD FRONT MOVING INTO SW WI AND NW IL DURING THE LATER AFTERNOON AND CONTINUING THRU MOST IF NOT ALL BUT FAR SE PORTION OF THE FA DURING FRI EVE. MODELS SHOW FRONT CONTINUING TO CENTRAL IND AND SOUTHERN IL BY MIDDAY SAT SO ALL BUT SOUTHEASTERN THIRD OF FA DRY WITH CHANCES OF LINGERING SHRA OR ISOLD TSRA FAR SE BEHIND DEPARTING COLD FRONT. FOR SAT NIGHT AND SUN...ANOTHER SHORT WAVE DEPICTED DROPPING FROM THE SOUTHERN CANADIAN ROCKIES INTO THE NORTHERN PLAINS AND THRU THE NRN GREAT LAKES. WHILE EXPECT SOME SURFACE REFLECTION OF THIS FEATURE FEEL WILL ONLY A TROF OR WEAK LOW WITH MAIN CLOUD AREA AND PRECIP FALLING ACROSS MN EWRD ACROSS WI. ENSEMBLE MEAN SHOW ANOTHER SHORT WAVE DIGGING DEEPER INTO THE NORTHERN PLAINS AND UPR MIDWEST FOR MON NIGHT AND TUE BRINGING MORE CHANCES OF RA. BEHIND THIS THE SIGNIFICANTLY COOLER AIR CURRENTLY HELD UP OVER ALBERTA AND SASKATCHEWAN IS ALLOWED TO OVERSPREAD THE NORTHERN PLAINS...UPR MIDWEST NORTHERN LAKES FOR MID NEXT WEEK PUTTING A TOUCH OF FALL IN THE AIR. TRS && .AVIATION... FOR THE 1800 UTC TAFS...GENERALLY BENIGN WEATHER EXPECTED OVER THE NEXT 24 HOURS. MORNING SOUNDINGS FROM ILX/DVN AS WELL AS RECENT ACARS SOUNDINGS FROM ORD SUGGEST THAT CONVECTIVE TEMP SHOULD BE REACHED AS TEMPS CLIMB INTO THE UPPER 80S THIS AFTERNOON. FORECAST AND MODIFIED OBSERVED SOUNDINGS SUGGEST UNCAPPED MLCAPES WILL POKE UP TO NEAR/JUST OVER 1000 J/KG THIS AFTERNOON WITH AMPLE SUNSHINE AND INCREASING LL MOISTURE...HOWEVER LACK OF TRIGGER/FOCUS SHOULD PRECLUDE ANY ORGANIZED SHRA/TSRA ACTIVITY THIS AFTERNOON/EVENING. THE INCREASED MOISTURE HAS ALLOWED FOR A GRADUAL REDUCTION IN VSBY THIS MORNING...THOUGH STILL VFR AT MOST LOCATIONS. BY TONIGHT DECOUPLING SURFACE AND INCREASED MOISTURE WILL PROBABLY ALLOW VSBYS TO FALL OFF MORE...PARTICULARLY AT RFD/DPA AWAY FROM THE URBAN HEAT ISLAND. KEPT VSBY VFR TONIGHT AT CHGO AIRFIELDS...HOWEVER CERTAINLY PLAUSIBLE THAT WE COULD SEE SOME MVFR CONDITIONS THERE TONIGHT AS WELL. UPPER LOW OVER SOUTHERN PLAINS IS PROGGED TO LIFT NORTHEASTWARD TONIGHT WITH DEEPER MOISTURE AND ASCENT ASSOCIATED WITH THIS FEATURE ALSO LIFTING NORTHWARD. PRECIP CHANCES WILL BE ON THE INCREASE TOWARD THE END OF THIS TAF CYCLE WITH SHRA POSSIBLY EVEN A THUNDERSTORM OR TWO FROM LATE MORNING THROUGH THURSDAY AFTERNOON. LOWER CIGS WITH PRECIPITATION SHIELD WITH THE UPPER LOW WILL ALSO MIGRATE NORTHWARD INTO THE AREA TUESDAY MORNING WITH MVFR CIGS A GOOD BET BY MIDDAY THURS. IZZI && .MARINE DISCUSSION... 1241 PM SOUTHERLY WINDS WILL CONTINUE UP AND DOWN THE LAKE THROUGH THE NEXT 24-48 HOURS AS LOW PRESSURE INITIALLY NEARLY STATIONARY OVER THE NORTHERN HIGH PLAINS...BEGINS LIFTING NORTHEASTWARD TOWARD JAMES BAY. UPPER TROUGH RIPPLING THROUGH THE POLAR JET OVER SOUTHERN CANADA WILL AMPLIFY A BIT FRIDAY WITH ASSOCIATED SURFACE LOW ALSO PROGGED TO DEEPEN...POSSIBLY AS LOW AS 990MB OR A BIT LOWER AS IT LIFTS NE TOWARD JAMES BAY. TIGHTENING PRESSURE GRADIENT SHOULD ALLOW FOR SOUTHERLY FLOW TO GRADUALLY STRENGTHEN OVER THE NEXT COUPLE DAYS WITH WINDS LIKELY INCREASING TO AT LEAST 30KT OVER MUCH OF THE OPEN WATERS BY FRIDAY. ITS LOOKING LESS IMPROBABLE WITH TIME THAT THERE COULD BE A PERIOD OF GALE FORCE WINDS FRIDAY MORNING...PARTICULARLY OVER NORTHERN LM. FOR NOW JUST BUMPED UP WINDS TO 30KT BUT GALES CERTAINLY OUT OF THE QUESTION COME LATE THURSDAY NIGHT INTO FRIDAY MORNING. COLD FRONT SHOULD SWEEP ACROSS THE LAKE LATE FRIDAY INTO FRIDAY EVENING WITH WINDS SLOWLY SUBSIDING AS THEY VEER AROUND TO NW THEN N BY SATURDAY. PERSISTENT AND INCREASINGLY STRONG SOUTHERLY FLOW UP THE FULL FETCH OF THE LAKE SHOULD WAVES TO BUILD WITH TIME...PROBABLY GETTING UP TO OVER 10FT BY EARLY FRIDAY AFTERNOON. IZZI && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 430 PM CDT WED SEP 5 2007 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-060930- 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 WED SEP 5 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TONIGHT THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY THROUGH SATURDAY MORNING...AND AGAIN ON TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-766-060930- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 430 AM CDT WED SEP 5 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TODAY AND TONIGHT THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY THROUGH SATURDAY MORNING...AND AGAIN ON TUESDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO
The Chicago radar (KLOT), 3 km away, was scanning. The volume nearest the first event began at 21:40 UTC.
1 thunderstorm wind. Local standard time, as filed.
Five to six inch diameter tree limbs were blown down on 159th street. Half of a Willow tree was also blown down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2007Every state in 2007This day in weather historyWarnings in Illinois, September 2007
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: 59227.