Temperatures climbed to near 90 on June 22nd and into the middle 90s on June 23rd, 24th and 25th with afternoon heat indices in the upper 90s. Overnight low temperatures ranged from the lower to middle 70s.
Every event with a place to put it; 1 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 episode as NWS LOT wrote it up.
Temperatures climbed to near 90 on June 22nd and into the middle 90s on June 23rd, 24th and 25th with afternoon heat indices in the upper 90s. Overnight low temperatures ranged from the lower to middle 70s.
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 Jun 22, 5:26 AM CST, 6 hours 34 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 626 AM CDT MON JUN 22 2009 .DISCUSSION... 308 AM CDT MAIN FORECAST ISSUE IS LOCALLY HEAVY RAINFALL WITH SLOW MOVING THUNDERSTORMS THIS MORNING. THEN FOCUS SHIFTS TO BUILDING HEAT AND HUMIDITY TUESDAY AND WEDNESDAY. THEN A BRIEF COOL DOWN BEFORE HEAT BUILDS AGAIN FOR SATURDAY. A LINE OF SCATTERED ELEVATED THUNDERSTORMS WAS OCCURRING ALONG A SHORT WAVE FROM EASTERN MN TO WESTERN WI TO NORTHERN IL. MORE INTENSE STORMS OVER WEST CENTRAL IL BACK INTO SE IA WERE OCCURRING ON NOSE OF LOW LEVEL JET AND IN AREA OF 70-75 SURFACE DEW POINTS. SHORT RANGE MODELS INDICATE THE LOW LEVEL JET TURNING MORE WESTERLY AND DYING OUT BY 12Z MONDAY. STORMS ALSO MOVING EAST INTO AN AREA WITH LOWER DEW POINTS AND LITTLE INSTABILITY. THEREFORE FEEL THUNDERSTORMS WILL BE ON A DOWNWARD TREND AS THEY MOVE EAST INTO THE CHICAGO METRO AREA THIS MORNING. LACK OF INSTABILITY AND WEAK SHEAR AND VERY HIGH FREEZING LEVELS WOULD SUGGEST LITTLE OR NO SEVERE WEATHER THREAT. BUT SINCE STORMS ARE MOVING VERY SLOWLY AND BEING FED BY VERY MOIST INFLOW...POTENTIAL FOR VERY HEAVY RAIN DOES EXIST. RADAR INDICATES RAINFALL OF 2.5 TO 3 INCHES OVER SOUTHWEST OGLE COUNTY IN PAST COUPLE HOURS. WILL CONTINUE TO MONITOR FOR POSSIBLE FLASH FLOOD THREAT. THE MID LEVEL SHORT WAVE WILL CONTINUE EAST ACROSS THE WESTERN GREAT LAKES THIS AFTERNOON. LOW LEVEL INFLOW WILL WEAKEN. AIR MASS WILL BECOME HOT HUMID AND UNSTABLE THIS AFTERNOON WITH ML CAPES OF 2000-3000 AND LITTLE OR NO CAP. MAIN QUESTION IS TRIGGER MECHANISM. WILL MAINTAIN LOW POPS THIS AFTERNOON FOR POSSIBILITY OF ISOLATED-SCATTERED AIR MASS THUNDERSTORMS. AGAIN LITTLE POTENTIAL FOR SEVERE WEATHER BUT THERE IS A THREAT OF HEAVY DOWNPOURS FROM SLOW MOVING STORMS IN VERY JUICY AIR MASS. UPPER RIDGE WILL THEN BUILD STRONGLY ACROSS THE MIDWEST TUESDAY INTO WEDNESDAY. WILL HAVE TO BE CAUTIOUS ABOUT AN MCS DEVELOPING NORTHWEST AND DRIFTING INTO THE AREA LATE TUESDAY NIGHT. OTHERWISE IT SHOULD BE HOT AND HUMID BOTH TUESDAY AND WEDNESDAY WITH HIGH TEMPERATURES IN THE LOWER TO MIDDLE 90S AND DEW POINTS IN THE LOWER TO MIDDLE 70S. THIS MAY CREATE HEAT INDICES OF AROUND 100 BOTH DAYS. EXPECT SOME COOLING ALONG THE LAKE FRONT TUESDAY BUT SOUTHWEST FLOW AHEAD OF APPROACHING COLD FRONT SHOULD BE ENOUGH TO OVERCOME LAKE BREEZE WEDNESDAY. MODELS CONTINUE TO MOVE A COUPLE SHORT WAVES OVER THE TOP OF THE UPPER RIDGE THROUGH SOUTHERN CANADA WEDNESDAY AND WEDNESDAY NIGHT WHICH PUSHES A WEAK COLD FRONT THROUGH THE AREA WEDNESDAY NIGHT AND THURSDAY. UPPER LEVEL SUPPORT WILL BE WELL NORTH OF THE FORECAST AREA...BUT WEAK SURFACE CONVERGENCE ALONG FRONT MOVING INTO VERY MOIST UNSTABLE AIR MASS COULD PRODUCE THUNDERSTORMS. GFS AND ECMWF EVENTUALLY CARVE OUT AN UPPER LOW OVER NORTHEAST CANADA THURSDAY WHILE RIDGE REBUILDS OVER THE NORTHERN PLAINS. THE RESULTING NORTHWESTERLY FLOW SHOULD BRING SOME RELIEF TO THE HEAT AND HUMIDITY THURSDAY. BUT THIS WILL BE SHORT LIVED AS UPPER RIDGE REBUILDS INTO THE WESTERN LAKES AGAIN LATER FRIDAY AND SATURDAY. ANOTHER SHORT WAVE TOPPING THE RIDGE SATURDAY BRINGS ANOTHER CHANCE OF THUNDERSTORMS. ECMWF KEEPS THIS PATTERN GOING WELL INTO NEXT WEEK. ALLSOPP && .AVIATION... 626 AM CDT 1200 UTC TAFS...EARLY MORNING BATCH OF RAIN AND THUNDERSTORMS CONTINUES TO MOVE OFF TO THE EAST AND WEAKEN ACROSS THE TAF REGION. CONDITIONS SHOULD QUICKLY IMPROVE OVER THE NEXT HOUR OR SO AS THESE SHOWERS MOVE OFF TO THE EAST AND SKIES/VIS CLIMB BACK UP TO VFR REGION WIDE. LIGHT AND VARIABLE WIND FIELD IS EXPECTED TO GO MORE SOUTHEAST THIS MORNING AND THEN WESTERLY THIS AFTERNOON AS A WARM FRONT MOVES ON THROUGH. ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO REDEVELOP THIS AFTERNOON WITH INCREASING INSTABILITY AND THE LACK OF A CAP TO HOLD THINGS BACK. NO REAL TRIGGER HERE TO START THINGS OFF...SO WILL LIKELY JUST SEE SHOWERS POPPING UP HERE AND THERE AND SOME EVENTUAL THUNDERSTORMS FORMING. THESE THUNDERSTORMS SHOULD QUICKLY DIMINISH AS THE SUN SETS AND A RIDGE OF HIGH PRESSURE SETS UP ACROSS THE GREAT LAKES. WINDS WILL REMAIN LIGHT THROUGHOUT...PARTICULARLY OVERNIGHT MONDAY INTO TUESDAY MORNING WITH THE RIDGE OF HIGH PRESSURE OVERHEAD. HALBACH && .MARINE... 159 AM CDT CONTINUED PERIOD OF LIGHT WINDS ARE EXPECTED TO CONTINUE THROUGH THE NEXT WEEK AS A RIDGE OF HIGH PRESSURE DOMINATES THE WEATHER PATTERN ACROSS THE GREAT LAKES. MAIN THREAT ACROSS THE LAKES WILL BE WITH ANY THUNDERSTORMS THAT DEVELOP AND TRACK ACROSS THE LAKE. BEST CHANCES FOR ANY STORMS WILL BE TODAY AS A WARM FRONT MOVES ACROSS THE REGION AND WEDNESDAY NIGHT INTO THURSDAY MORNING AS A COLD FRONT DROPS DOWN THROUGH THE REGION. OTHERWISE...WINDS AND GUSTS ARE EXPECTED TO REMAIN 15KTS OR LESS THROUGHOUT. HALBACH && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1119 AM CDT MON JUN 22 2009 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 231630- 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- 1119 AM CDT MON JUN 22 2009 /1219 PM EDT MON JUN 22 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...THIS AFTERNOON AND TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS WHICH COULD PRODUCE: VERY HEAVY RAINFALL AND LOCALIZED FLOODING FREQUENT CLOUD TO GROUND LIGHTNING AREAS AFFECTED AND TIMING: NORTHERN ILLINOIS AND NORTHWEST INDIANA...MAINLY AFTER 300 PM CDT IN ISOLATED COVERAGE. DISCUSSION: AIR MASS IS RECOVERING WELL IN THE WAKE OF THIS MORNINGS THUNDERSTORMS. SURFACE TEMPERATURES ALREADY INTO THE LOWER 80S AT 1100 AM WITH DEW POINTS IN LOWER 70S. AFTERNOON HEATING WILL SUPPORT MORE STORMS AS DESTABILIZATION CONTINUES. HOWEVER...WIND PROFILES ARE VERY WEAK AND LOW LEVEL FORCING PRACTICALLY NIL SO STORMS ARE NOT EXPECTED TO BECOME SEVERE. PORTIONS OF THE DES PLAINES AND FOX RIVERS WILL REMAIN IN FLOOD. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY AFTERNOON THROUGH THURSDAY...AND AGAIN SATURDAY. PORTIONS OF THE DES PLAINES AND FOX RIVERS 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>745-231630- 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- 1119 AM CDT MON JUN 22 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED THUNDERSTORMS MAY DEVELOP LATE THIS AFTERNOON AND CONTINUE TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE OF THUNDERSTORMS LATE WEDNESDAY THROUGH THURSDAY AND AGAIN SATURDAY. && 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- 870-872-874-876-878-231630- 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 TOW 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- 1119 AM CDT MON JUN 22 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE WILL BE SCATTERED THUNDERSTORMS THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY AND THURSDAY...AND AGAIN SATURDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO MERZLOCK
The national radar mosaic for the moment the first event began.
3 excessive heat. Local standard time, as filed.
A 32 year old male walked into a fitness center in Crete on the afternoon of June 23rd and was disoriented and appeared to have been working outside in the heat. He suffered a heat storke and was taken to the hospital, where he died two days later.
An 11 year old girl suffered a heat stroke after being left outside in very hot conditions on June 25th in the 9300 block of South Green Street in Chicago. A 59 year old woman died from heat stress in her home early on June 26th on Rice Street in Chicago. A 39 year old man died from heat stress in June 23rd on 95th Street in Hickory Hills.
A maintenance caretaker was found dead next to his tractor. He was mowing grass at a soccer field on Old Pine Bluff Road.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Excessive Heat, Will | 2009-06-25 | 32 | Male | Outside/Open Areas | Direct |
| Excessive Heat, Cook | 2009-06-25 | 11 | Female | Outside/Open Areas | Direct |
| Excessive Heat, Cook | 2009-06-26 | 59 | Female | Permanent Home | Direct |
| Excessive Heat, Cook | 2009-06-23 | 39 | Male | Permanent Home | Direct |
| Excessive Heat, Grundy | 2009-06-22 | 78 | Male | Outside/Open Areas | Direct |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2009Every state in 2009This day in weather historyWarnings in Illinois, June 2009
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: 185463, 185464, 185676.