4 lightning, 3 thunderstorm wind, 1 hail, as filed by the National Weather Service.
Every event with a place to put it; 4 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 24, 2:45 AM CST, 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 345 AM CDT THU AUG 24 2006 .DISCUSSION FOR MORNING GRIDS ZONES/GRIDS... 345 AM CDT MAIN FORECAST CONCERN WILL BE ON PRECIP POTENTIAL FROM THIS MORNING INTO THE WEEKEND. THE FIRST UPPER LEVEL SHORT WAVE TROUGH HAS EXITED INTO SOUTHWEST LOWER MICHIGAN THIS MORNING...BUT NEXT SHEARED OUT VORT MAX IS ON ITS HEELS ACROSS NORTHWEST WISCONSIN. BLUE RIVER PROFILER HAS BEEN INDICATING A 20-30 KNOT SWRLY LLJ AND GIVEN APPROACH OF SHEARED OUT VORT MAX AND PERSISTENT LOW LEVEL WARM ADVECTION WILL CONTINUE WITH LIKELY POPS THIS MORNING ACROSS NERN IL AND FAR NWRN INDIANA. SHEAR PROFILES REMAIN IMPRESSIVE EARLY THIS MORNING IN THE 40-50 KNOT RANGE WITH REINFORCING UPPER JET STREAK. SEVERE THREAT SHOULD BE MAINTAINED OVER THE NEXT FEW HOURS ACROSS NERN IL/NWRN INDIANA UNTIL LOW LEVEL JET BEGINS TO WEAKEN TOWARD SUNRISE. CONVECTION WILL AID IN TAKING BOUNDARY SOUTHWARD THIS MORNING...WITH GFS INDICATING SURFACE BOUNDARY REACHING SOUTHERN HALF OF CWA BY 00Z THIS EVENING. PASSAGE OF THIS BOUNDARY WILL LEAD TO INSTABILITY MORE ELEVATED IN NATURE TODAY ACROSS THE CWA TODAY. DEPSITE BOUNDARY SAGGING SOUTHWARD...LOW LEVEL MOISTURE PROGS ARE A BIT LESS IMPRESSIVE ACROSS SOUTHERN HALF OF CWA SO SOME CONCERN THAT CAPPING WILL LIMIT PRECIP POTENTIAL. AFTER HIGHER POPS ACROSS THE NORTHEAST PORTIONS OF THE CWA THIS MORNING...WILL TREND TO LOWER CHANCE POPS BY LATE THIS MORNING INTO THIS AFTERNOON. UPPER FORCING IS SOMEWHAT WEAKER THIS AFTERNOON WITH PASSAGE OF THE AFOREMENTIONED SHEARED OUT VORT MAX LATER TO THE NORTH OF THE AREA THIS MORNING. NOT MUCH TO FOCUS CONVECTION THIS AFTERNOON SO LOW POPS SEEM IN ORDER. A MORE SIGNIFICANT SHORT WAVE IS EXPECTED TO MOVE INTO THE UPPER MISSISSPPI VALLEY LATE TONIGHT WHICH WILL ALLOW BOUNDARY TO RETURN NORTHWARD AS A WARM FRONT. WILL GO WITH CHANCE POPS FOR THUNDER THIS EVENING GENERALLY NORTH OF I-88 AS NEXT UPPER JET STREAK CUTTING THROUGH THE BASE OF THIS UPPER TROUGH APPROACHES. FEEL THAT BEST THREAT OF SEVERE WILL BE THIS EVENING NORTH OF I-88. WITH NORTHWARD SURGING FRONT EXPECTING CAPPED CONDITIONS TO EVOLVE OVERNIGHT SO WILL TREND FORECAST DRY AFTER 06Z. WARMEST DAY OF THE FORECAST STILL APPEARS TO BE IN ORDER FOR FRIDAY AS CWA IS ENTRENCHED IN WARM SECTOR. CAPPED CONDITIONS ARE LIKELY TO HOLD...EXCEPT AT RFD WHERE SOME BETTER LOW LEVEL MOISTURE RETURN IS LIKELY DURING THE AFTERNOON IN ADVANCE OF SURFACE LOW MOVING INTO WESTERN WISCONSIN. WILL EXPAND CHANCE OF THUNDER ACROSS REMAINDER OF CWA FRIDAY NIGHT INTO SATURDAY AS NEXT LOW LEVEL BOUNDARY APPROACHES. ALOT OF QUESTIONS STILL REMAIN FOR SUNDAY AND MONDAY REGARDING EVOLUTION OF ANOTHER CENTRAL ROCKIES UPPER TROUGH AND ITS IMPACT ON FRONTAL POSITION SUNDAY/MONDAY. HAVE OPTED TO KEEP POPS IN FOR SUNDAY BUT NOT EXTEND POPS INTO MONDAY. HAVE MADE NO OTHER CHANGES TO THE EXTENDED AT THIS POINT. && .AVIATION...FOR 06Z TAFS... 101 AM CDT WIND AND CONVECTIVE POTENTIAL REMAIN MAIN PROBLEMS FOR AVIATION CONCERNS THIS TAF PERIOD. LATE EVENING PROFILER/WATER VAPOR ANALYSIS INDICATES MID LEVEL SHORT WAVE TROUGH MOVING SOUTHEAST ACROSS WI. WAA ON SWLY 20-25 KT 850 HPA JET ASSOCIATED WITH THIS FEATURE HELPING TO MAINTAIN ELEVATED TRW FROM SRN WI TO SRN LAKE MICHIGAN...JUST OFF TO THE NORTHEAST OF CHI AREA TERMINALS. MODEL FORECASTS TAKE THIS SHORT WAVE SOUTHEAST INTO IN/LWR MI/OH THIS MORNING...WITH LLVL JET GRADUALLY VEERING MORE WLY ACROSS FCST AREA...WITH CONVECTION CONTINUING TO CLIP FAR NORTHEAST PARTS OF IL THROUGH SUNRISE. REDEVELOPMENT OCCURRING ACROSS WRN WI LOOKS TO KEEP ACTIVITY GOING FOR NEXT SVRL HOURS...WITH TRAJECTORY OF CELLS WRN/SWRN WI SUGGESTING TRW MAY AFFECT TERMINALS DURG PREDAWN HOURS. WHILE BEST THREAT APPEARS TO REMAIN JUST OFF TO THE NORTH OF TERMINAL SITES...POTENTIAL FOR OUTFLOW SAGGING SOUTH/SOUTHWEST CALLS FOR A TEMPO MENTION FOR A FEW HOURS ROUGHLY 08-12Z. SVRL OTHER WEAK/MINOR WAVES APPEAR UPSTREAM...WITH MODELS CONTINUING TO GENERATE QPF ALONG/NORTH OF FRONT DURING THE DAY...THOUGH HAVE TRIED TO HIGHLIGHT TIMES OF BEST FORCING AND/OR INSTABILITY IN TAFS. SHORT WAVE DROPS SOUTHEAST TOWARD OHIO LATER THIS MORNING WHICH ALONG WITH DIURNAL INSTABILITY MINIMA SUGGESTS DECREASING THREAT FOR CONVECTION AFTER 12Z. WIND FORECAST BECOMES RATHER TRICKY AGAIN HOWEVER...AS MODELS INDICATE FRONT SAGGING SOUTH INTO IL AGAIN IN WAKE OF SHORT WAVE PASSAGE. COMPLICATING FACTOR WILL BE EFFECT OF OUTFLOW BOUNDARIES FROM MORNING CONVECTION...WHICH MAY HELP SHOVE FRONT TO THE SOUTH. DIFFERENCES IN TIMING/ORIENTATION BETWEEN MODEL RUNS SO HAVE GONE WITH A BIT OF A BLEND...BRINGING FRONT BACK ACROSS TERMINALS BY 18Z WITH WIND SHIFT TO E/NE. WITH FRONT DRAPED ACROSS NRN IL CONVECTIVE REDEVELOPMENT BECOMES A QUESTION AGAIN THIS AFTERNOON...AS GFS/WRF BOTH INDICATE ANOTHER SHORT WAVE PUSHING ACROSS MN/IA AND MS VLY. TIMING DIFFERENCES REMAIN BETWEEN MODEL SOLUTIONS...BUT HAVE INDICATED A VCTS FOR NOW AFTER ABOUT 22 UTC. STRONGER MID LEVEL WAVE MOVING ACROSS PLAINS LATER THIS EVENING EXPECTED TO LIFT FRONT BACK NORTH OF TERMINALS OVERNIGHT. THUS...WILL SHADE BACK TO MORE SLY WIND DIRECTION AFTER 02-03Z. RATZER && .LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 430 AM CDT THU AUG 24 2006 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-250930- 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 AM CDT THU AUG 24 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY THIS MORNING FROM NORTH CENTRAL ILLINOIS INTO NORTHEAST ILLINOIS. SOME OF THESE STORMS WILL PRODUCE LARGE HAIL AND DAMAGING WINDS. THERE IS A CONTINUED CHANCE OF THUNDERSTORMS THIS AFTERNOON INTO THIS EVENING. THERE IS A SLIGHT RISK FOR ADDITIONAL SEVERE THUNDERSTORMS LATE THIS AFTERNOON INTO THIS EVENING NORTH OF A LINE FROM AMBOY TO OSWEGO TO CALUMET CITY. THE THREAT OF SEVERE WEATHER WILL DIMINISH AFTER MIDNIGHT. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY THERE IS ANOTHER CHANCE OF THUNDERSTORMS FROM FRIDAY THROUGH SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NECESSARY THIS MORNING...AND MAY BE NEEDED AGAIN THIS AFTERNOON. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-250930- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 430 AM CDT THU AUG 24 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY THIS MORNING. SOME OF THESE STORMS WILL PRODUCE LARGE HAIL AND WIND GUSTS IN EXCESS OF 35 KNOTS. THERE IS ANOTHER CHANCE OF THUNDERSTORMS FROM THIS AFTERNOON INTO THIS EVENING. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON INTO THIS EVENING. THE MAIN THREATS WILL BE LARGE HAIL AND WIND GUSTS IN EXCESS OF 35 KNOTS. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY THERE IS A CONTINUED CHANCE OF THUNDERSTORMS FRIDAY THROUGH SUNDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1214 AM CDT THU AUG 24 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0518 PM WATER SPOUT 27 ENE CHICAGO 42.03N 87.14W
08/23/2006 LMZ766 IN OTHER FEDERAL
PILOT OBSERVED A WATERSPOUT FROM 15 MILES ENE OF OHARE.
LOCATION ADJUSTED BASED ON RADAR DATA. REPORT RELAYED
THROUGH FAA.
0520 PM WATER SPOUT 28 E CHICAGO 41.88N 87.09W
08/23/2006 LMZ766 IN OTHER FEDERAL
PILOT OBSERVED WATERSPOUT FROM 15 MILES EAST OF OHARE.
LOCATION ADJUSTED BASED ON RADAR DATA. RELAYED VIA THE
FAA.
0614 PM TSTM WND GST TOWN OF PINES 41.69N 86.95W
08/23/2006 E75.00 MPH PORTER IN TRAINED SPOTTER
0615 PM TSTM WND DMG BEVERLY SHORES 41.69N 86.98W
08/23/2006 PORTER IN EMERGENCY MNGR
TREES AND POWER LINES DOWN IN TOWN.
0615 PM TSTM WND DMG TOWN OF PINES 41.69N 86.95W
08/23/2006 PORTER IN EMERGENCY MNGR
TREES AND POWER LINES DOWN
0700 PM HAIL CHESTERTON 41.60N 87.06W
08/23/2006 E1.75 INCH PORTER IN EMERGENCY MNGR
SE SECTION OF CHESTERTON - GOLF BALL SIZE HAIL AT ROUTE
20 AND BEAN. PEA SIZE HAIL AT ROUTE 20 AND WAVERLY.
0715 PM TSTM WND DMG VALPARAISO 41.48N 87.05W
08/23/2006 PORTER IN EMERGENCY MNGR
TREES DOWN, WINDOWS BLOWN OUT OF A COUPLE OF BUILDINGS IN
THE WASHINGTON STREET, RANDALL STREET, AND FAIRLANE DRIVE
AREAS.
0715 PM HAIL VALPARAISO 41.48N 87.05W
08/23/2006 M0.75 INCH PORTER IN TRAINED SPOTTER
ON VALPARAISO CAMPUS
0745 PM TSTM WND DMG KOUTS 41.32N 87.03W
08/23/2006 PORTER IN FIRE DEPT/RESCUE
MANY TREES DOWN
&&
HANDELThe Milwaukee radar (KMKX), 71 km away, was scanning. The volume nearest the first event began at 09:30 UTC.
4 lightning, 3 thunderstorm wind, 1 hail. Local standard time, as filed.
Trees and tree limbs were blown down on Route 76 at Hunter and Capron Roads.
Trees and tree limbs were blown down. A house and a truck were damaged in Capron.
Lightning struck a house which started a fire.
Trees and power lines were blown down.
Lightning struck a tree, which fell down and also blew out basement windows.
Two houses were struck by lightning in Buffalo Grove. The roof of one house was completed destroyed by fire. The second house was heavily damaged by fire.
Lightning struck a house on Barb Hill Drive, which caused $20,000 in damage to the house and another $5,000 to the contents.
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: 5525583, 5525660, 5525658, 5525584, 5525585, 5525656, 5525659, 5525657.