A line of severe thunderstorms moved from Iowa into northwest Illinois during the mid afternoon hours and then raced east across northern Illinois producing damaging winds as high as 90 mph. These thunderstorms produced widespread wind and tree damage across northern Illinois.
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 line of severe thunderstorms moved from Iowa into northwest Illinois during the mid afternoon hours and then raced east across northern Illinois producing damaging winds as high as 90 mph. These thunderstorms produced widespread wind and tree damage across northern Illinois. More than half a million customers lost power during the storms.
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 18, 12:47 PM CST, 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 147 PM CDT FRI JUN 18 2010 .MESOSCALE DISCUSSION... 148 PM CDT VERY LITTLE CHANGE IN THINKING FROM PREVIOUS MESOSCALE UPDATE WITH WELL DEVELOPED BOW ECHO CROSSING THE MS RIVER INTO NW IL AT THIS TIME. KDVN WSR-88D HAS SHOWN SOME TRANSIENT MESOVORTS DEVELOPING ALONG THE LEADING EDGE OF THE LINE WITH REPORTS OF 60-70 MPH WINDS. ATMOSPHERE IS BECOMING INCREASINGLY VOLATILE WITH THE PARTIAL 1800 UTC SOUNDING FROM KDVN SHOWING MEAN LAYER LI'S DOWN TO -11C. RECENT GOES VISIBLE IMAGERY IS ALSO SHOWING CUMULUS FINALLY POPPING OVER NORTHERN IL IN ADVANCE OF THIS BOW...ANOTHER INDICATION THAT THIS BOW WILL SOON BE ABLE TO BETTER REALIZE THE MASSIVE AMOUNT OF SFC BASED INSTABILITY THAT IS PRESENT. DVN WSR-88D IS ALSO SHOWING A MESOSCALE MID LEVEL REAR INFLOW JET OF 60KT+ WHICH GIVEN THE WEAKENING CAP AND EXPLOSIVE INSTABILITY SHOULD ALLOW BOW ECHO TO MAINTAIN ITS INTENSITY AND PROBABLY EVEN INTENSIFY AS IT RACES EAST ACROSS NORTHERN ILLINOIS. GIVEN THE FAST MOVEMENT OF THE STORMS WILL LIKELY HAVE TO BE WARNING FOR LINE WELL AHEAD OF ITS ARRIVAL. WHILE LOW LEVEL SHEAR IS NOT OVERLY IMPRESSIVE...WILL STILL NEED TO MONITOR FOR BRIEF SPIN-UP TYPE TORNADO POTENTIAL WITH ANY OF THE MORE SIGNIFICANT MESOVORTS ALONG THE LEADING EDGE OF THE BOW. IZZI && .DISCUSSION... 320 AM CDT LEADING EDGE OF ARC THUNDERSTORMS CURRENTLY MOVING INTO NW CORNER OF FA WHILE NUMBER OF DISCRETE CELLS DEVELOPING OVER NE IL AHEAD OF THE LINE MAIN HAS BEEN SLOWLY INCREASING. THESE CELLS ARE DEVELOPING AS COOLER MID LEVEL TEMPS AS SEEN IN 00Z UPSTREAM RAOBS ADVECT OVER NORTHERN IL RESULTING IN STEEPENING MID LEVEL LAPSE EVEN THOUGH GREATEST LOW LEVEL CAPE AND MOST UNSTABLE BL ENVIRONMENT IN PLACE FROM E CENTRAL IA SSW ACROSS W CENTRAL IL AND NE MO. THREAT OF DAMAGING WINDS DIMINISHED AND NO RECENT REPORTS FROM UPSTREAM SO CURRENT WATCH WILL BE ALLOWED TO EXPIRE AT 08Z. EXTRAPOLATION BASED ON RECENT MOVEMENT HAS LINE OF TSRA MOVING ACROSS NE IL AND NW IN BETWEEN 09Z AND 11Z...THOUGH A 100 MI WIDE AREA OF RA WITH A FEW EMBEDDED FOLLOWS THE LEADING LINE OF TS AND WILL CLEAR N CENTRAL IL BY EARLY MORNING...NE IL BY MID MORNING...AND NW IN BY LATE MORNING ASSUMING IT CAN MAINTAIN ITSELF THAT LONG. AFTER RAIN AND ACCOMPANYING CLOUDS CLEAR HEATING WILL ALLOW DESTABILIZATION OF PREVIOUSLY RAIN COOLED AIR FOR THE AFTERNOON AND EARLY EVENING MODELS INDICATING ML CAPES OF 4000+ J/KG IN PLACE ACROSS AREA AS PAIR OF SHORT WAVES...ONE MOVING OUT OF THE NORTHER ROCKIES AND THE OTHER FROM THE CENTRAL HIGH PLAINS MOVES ACROSS THE MID AND LOWER MO VALLEY TOWARD THE MID MS VALLEY THIS AFTERNOON. EXPECT ANOTHER LINE OF THUNDERSTORMS TO DEVELOP IN AREA OF MAX INSTABILITY AHEAD OF THE NE-SW ORIENTED COLD FRONT TO BE MOVING INTO E CENTRAL AND SW WI...AND NE IA BY EARLY EVENING. DUE THE BROAD AREA OF INSTABILITY AND CAPE AHEAD OF THE APPROACHING COLD FRONT AND SUSPECTED LINGERING OUTFLOW BOUNDARIES ALSO EXPECT DISCRETE THUNDERSTORMS DEVELOPING FURTHER REMOVED FROM THE COLD FRONT...DOWNSTREAM OVER THE LOCAL AREA. COLD FRONT TO PUSH THROUGH ALL BUT POSSIBLY FAR SE CORNER OF FA BY 12Z SAT SO HAVE CHC POPS DURING THE MORNING THERE FOR ANY LINGERING THUNDERSTORMS OR SHOWERS WITH FROPA OF LINGERING JUST BEHIND. REST OF SATURDAY AND MOST IF NOT ALL OF SAT NIGHT TO BE DRY ANS FRONT PUSHES S TO LOWER OH VALLEY AND SOUTHERN IL WITH RIDGING SURFACE AND ALOFT OVER THE LOCAL AREA. THREAT OF THUNDERSTORMS RETURNS RATHER QUICKLY THOUGH FOR SUNDAY-SUNDAY NIGHT AS THE FRONT RETURNS NORTH AS THE NEXT SHORT WAVE AND ASSOCIATED SURFACE WAVE MOVE E ACROSS THE PLAINS. TODAY TO BE VERY WARM AND MUGGY WITH TEMPS OF AROUND 90 INDICATED AND DEW POINTS REMAINING IN THE UPPER 60S AND LOWER 70S RESULTING IN HEAT INDEX VALUES IN THE UPPER 90S. WILL BE A DECENT SSW BREEZE TODAY BUT WILL NOT PROVIDE MUCH RELIEF. COOL FRONT DROPS TEMPS AND DEW POINTS A BIT FOR SAT AND SUN...AT LEAST ACROSS THE NORTHERN PART OF THE FA...BEFORE TEMPS AND DEW POINTS CLIMB AGAIN WITH WARM FRONT MOVING BACK NORTH ACROSS THE AREA DURING MON. TRS && .DISCUSSION... 320 AM CDT LEADING EDGE OF ARC THUNDERSTORMS CURRENTLY MOVING INTO NW CORNER OF FA WHILE NUMBER OF DISCRETE CELLS DEVELOPING OVER NE IL AHEAD OF THE LINE MAIN HAS BEEN SLOWLY INCREASING. THESE CELLS ARE DEVELOPING AS COOLER MID LEVEL TEMPS AS SEEN IN 00Z UPSTREAM RAOBS ADVECT OVER NORTHERN IL RESULTING IN STEEPENING MID LEVEL LAPSE EVEN THOUGH GREATEST LOW LEVEL CAPE AND MOST UNSTABLE BL ENVIRONMENT IN PLACE FROM E CENTRAL IA SSW ACROSS W CENTRAL IL AND NE MO. THREAT OF DAMAGING WINDS DIMINISHED AND NO RECENT REPORTS FROM UPSTREAM SO CURRENT WATCH WILL BE ALLOWED TO EXPIRE AT 08Z. EXTRAPOLATION BASED ON RECENT MOVEMENT HAS LINE OF TSRA MOVING ACROSS NE IL AND NW IN BETWEEN 09Z AND 11Z...THOUGH A 100 MI WIDE AREA OF RA WITH A FEW EMBEDDED FOLLOWS THE LEADING LINE OF TS AND WILL CLEAR N CENTRAL IL BY EARLY MORNING...NE IL BY MID MORNING...AND NW IN BY LATE MORNING ASSUMING IT CAN MAINTAIN ITSELF THAT LONG. AFTER RAIN AND ACCOMPANYING CLOUDS CLEAR HEATING WILL ALLOW DESTABILIZATION OF PREVIOUSLY RAIN COOLED AIR FOR THE AFTERNOON AND EARLY EVENING MODELS INDICATING ML CAPES OF 4000+ J/KG IN PLACE ACROSS AREA AS PAIR OF SHORT WAVES...ONE MOVING OUT OF THE NORTHER ROCKIES AND THE OTHER FROM THE CENTRAL HIGH PLAINS MOVES ACROSS THE MID AND LOWER MO VALLEY TOWARD THE MID MS VALLEY THIS AFTERNOON. EXPECT ANOTHER LINE OF THUNDERSTORMS TO DEVELOP IN AREA OF MAX INSTABILITY AHEAD OF THE NE-SW ORIENTED COLD FRONT TO BE MOVING INTO E CENTRAL AND SW WI...AND NE IA BY EARLY EVENING. DUE THE BROAD AREA OF INSTABILITY AND CAPE AHEAD OF THE APPROACHING COLD FRONT AND SUSPECTED LINGERING OUTFLOW BOUNDARIES ALSO EXPECT DISCRETE THUNDERSTORMS DEVELOPING FURTHER REMOVED FROM THE COLD FRONT...DOWNSTREAM OVER THE LOCAL AREA. COLD FRONT TO PUSH THROUGH ALL BUT POSSIBLY FAR SE CORNER OF FA BY 12Z SAT SO HAVE CHC POPS DURING THE MORNING THERE FOR ANY LINGERING THUNDERSTORMS OR SHOWERS WITH FROPA OF LINGERING JUST BEHIND. REST OF SATURDAY AND MOST IF NOT ALL OF SAT NIGHT TO BE DRY ANS FRONT PUSHES S TO LOWER OH VALLEY AND SOUTHERN IL WITH RIDGING SURFACE AND ALOFT OVER THE LOCAL AREA. THREAT OF THUNDERSTORMS RETURNS RATHER QUICKLY THOUGH FOR SUNDAY-SUNDAY NIGHT AS THE FRONT RETURNS NORTH AS THE NEXT SHORT WAVE AND ASSOCIATED SURFACE WAVE MOVE E ACROSS THE PLAINS. TODAY TO BE VERY WARM AND MUGGY WITH TEMPS OF AROUND 90 INDICATED AND DEW POINTS REMAINING IN THE UPPER 60S AND LOWER 70S RESULTING IN HEAT INDEX VALUES IN THE UPPER 90S. WILL BE A DECENT SSW BREEZE TODAY BUT WILL NOT PROVIDE MUCH RELIEF. COOL FRONT DROPS TEMPS AND DEW POINTS A BIT FOR SAT AND SUN...AT LEAST ACROSS THE NORTHERN PART OF THE FA...BEFORE TEMPS AND DEW POINTS CLIMB AGAIN WITH WARM FRONT MOVING BACK NORTH ACROSS THE AREA DURING MON. TRS && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 18Z... LINE OF CONVECTION IN IOWA...TIMING/COVERAGE HEADING TO ORD/MDW BTWN 20-22Z. CONTINUED TSRA THRU THIS EVE FOR ORD/MDW BTWN 00Z AND 04Z...PRECISE TIMING/COVERAGE REMAINS A CONCERN. ADDTL TSRA AFT 00Z THRU 04Z PSBL. WIND DIR/SPEED ALSO A CONCERN. BEACHLER //DISCUSSION...UPDATED 18Z... LINE OF CONVECTION CONTINUES TO SLIDE EAST ACROSS IOWA...AND SHUD ARRIVE ACROSS WESTERN SECTIONS OF ILLINOIS BY 19Z. BASED ON SOUNDINGS THE ATMOS ACROSS NORTHERN IL REMAINS CAPPED...HOWEVER ANTICIPATE AS SFC CONTINUES TO HEAT UP WE WILL BE ABLE TO BREAK THE CAP AND SEE ADDTL TSRA DEVELOPMENT BTWN 21-00Z. FOR NOW HAVE OPTED TO INCLUDE TEMPO GROUP AFT 20Z TO HANDLE LINE OF CONVECTION ARRIVING AT ORD/MDW. TSRA AT RFD BY 1930Z ALONG WITH WESTERN IL AIRFIELDS. INITIAL LINE OF CONVECTION WILL CONTINUE TO PUSH EAST BY 00Z...HOWEVER A SECONDARY LINE OF CONVECTION IS TRYING TO DEVELOP FURTHER WEST OF THE INITIAL LINE. WINDS SHUD REMAIN S/SW THRU 00Z...WITH PERIODIC GUSTS OF 19-23KTS. GUIDANCE SUGGESTS SECOND LINE OF TSRA MAY NOT ARRIVE UNTIL AFT 00Z...THUS HAVE OPTED FOR A SECOND TEMPO LINE TO HANDLE IT. SECOND LINE OF TSRA SHUD PUSH THRU BY 04Z...WHICH WILL BE ALONG THE BNDRY. FRONTAL BNDRY CONTINUES TO SLIDE FROM NW TO SE THRU THE EARLY MORNING HOURS SAT. WINDS WILL THEN TURN W/NW AND BECOME GUSTY. MODEL GUIDANCE SUGGESTS WINDS OF 20-30KTS COULD BE FILTERED TO THE SFC OR GUSTS OF 15-20KTS SAT THRU MIDDAY. BEACHLER //ORD AND MDW CONFIDENCE...UPDATED 18Z... HIGH CONFIDENCE IN CONVECTION AFT 20Z. HIGH CONFIDENCE ON TIMING/COVERAGE AFT 20Z. HIGH CONFIDENCE IN WIND FORECAST FROM SE TO S/SW THRU 00Z. MEDIUM CONFIDENCE ON ADDTL TSRA AFT 00Z. BEACHLER //OUTLOOK FOR ORD/MDW FOR 06Z SUNDAY-12Z FRIDAY...UPDATED 18Z... SATURDAY NIGHT...MAINLY VFR. ISO TSRA. SUNDAY...CHC TSRA. MAINLY VFR. MONDAY...CHC TSRA. MAINLY VFR. TUESDAY...CHC TSRA. MAINLY VFR. WEDNESDAY...CHC TSRA. MAINLY VFR. THURSDAY... BEACHLER && .MARINE... 333 AM CDT SOUTHERLY FLOW WILL CONTINUE TO INCREASE TODAY AS HIGH PRESSURE EXITS THE REGION AND LOW PRESSURE OVER THE EXTREME NORTHERN PLAINS MOVES INTO CANADA. A COLD FRONT EXTENDING SOUTH FROM THIS LOW SHOULD APPROACH THE OPEN WATERS OF LAKE MICHIGAN LATE THIS AFTERNOON AND INTO THE OVERNIGHT HOURS...ALLOWING THE SURFACE PRESSURE GRADIENT TO INCREASE. THE COLD FRONT WILL SWEEP ACROSS THE LAKE LATE TONIGHT AND INTO TOMORROW MORNING. WEAK HIGH PRESSURE WILL THEN BUILD IN BEHIND THE FRONT LEAVING LIGHT NORTHWESTERLY WINDS IN ITS WAKE. AS HIGH PRESSURE SETTLES IN OVER THE LAKE...A DIURNAL LAKE/LAND THERMAL CIRCULATION SHOULD DOMINATE AND LESS OF A PREVAILING GRADIENT FLOW...SO MAINLY LIGHT/VARIABLE WINDS OVER THE OPEN LAKE THROUGH THE WEEKEND. DID DECIDE TO HOLD OFF ON ANY SMALL CRAFT MENTION FOR TODAY. NOT FULLY CONFIDENT THAT WINDS WILL GUST TO SMALL CRAFT LEVELS...THOUGH THEY WILL BE CLOSE. LATEST GUIDANCE BACKED OFF SOME OVER PREVIOUS RUNS AND SUBSEQUENTLY KNOCKED WINDS DOWN CONSIDERABLY. WILL LET THE DAY SHIFT AND LATEST MODEL RUNS COME IN TO DECIDE IF ONE IS NEEDED FOR THIS AFTERNOON. SHEA && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1235 PM CDT FRI JUN 18 2010
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
191745-
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-
1235 PM CDT FRI JUN 18 2010 /135 PM EDT FRI JUN 18 2010/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...SOME LIKELY WILL BE SEVERE PRODUCING:
DAMAGING WINDS OVER 70 MPH.
HAIL TO THE SIZE OF HALF DOLLARS.
TORRENTIAL DOWNPOURS WHICH COULD RESULT IN FLASH FLOODING.
AND FREQUENT CLOUD TO GROUND LIGHTNING.
AREAS AFFECTED AND TIMING:
THUNDERSTORMS...SOME SEVERE...ARE LIKELY THIS AFTERNOON INTO
EARLY THIS EVENING. THUNDERSTORMS WILL LIKELY MOVE INTO NORTH
CENTRAL ALONG THE INTERSTATE 39 CORRIDOR AND WEST BETWEEN 2 AND
3 PM...AFFECTING NORTHEAST ILLINOIS BETWEEN 3 PM AND 6 PM...AND
INTO NORTHWEST INDIANA BETWEEN 5 PM AND 8 PM.
DISCUSSION:
MOSTLY SUNNY SKIES CONTINUE TO HEAT THE ATMOSPHERE...ALLOWING IT
TO BECOME VERY UNSTABLE. AS INSTABILITY CONTINUES TO INCREASE
THIS AFTERNOON THE STAGE WILL BE SET FOR STRONG TO SEVERE
THUNDERSTORMS OVER EASTERN IOWA TO RACE RAPIDLY EAST ACROSS THE
OUTLOOK AREA. GIVEN THE EXTREME INSTABILITY THE POTENTIAL EXISTS
FOR FAIRLY WIDESPREAD DAMAGING WINDS...WITH POSSIBLY LOCALLY
SIGNIFICANT WIND DAMAGE...ACROSS THE OUTLOOK AREA. WHILE THERE
IS A LOW END POTENTIAL FOR A BRIEF TORNADO ALONG THE LEADING
EDGE OF THE LINE...OVERWHELMINGLY THE MOST SIGNIFICANT HAZARD
THIS AFTERNOON WILL BE DAMAGING WINDS.
GIVEN THE VERY MOIST ATMOSPHERE...THE THUNDERSTORMS WILL BE
CAPABLE OF PRODUCING VERY HEAVY RAINFALL IN A SHORT PERIOD OF
TIME WHICH COULD RESULT IN LOCALIZED FLASH FLOODING.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS FROM SUNDAY
THROUGH WEDNESDAY NIGHT. THERE IS A SLIGHT CHANCE OF SEVERE
THUNDERSTORMS IN CENTRAL ILLINOIS SATURDAY NIGHT.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS WILL LIKELY BE NEEDED BETWEEN 2 PM AND 8 PM THIS
AFTERNOON AND EVENING.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
LMZ740>745-191745-
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-
1235 PM CDT FRI JUN 18 2010
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.
THUNDERSTORMS ARE LIKELY LATE THIS AFTERNOON OR EARLY THIS
EVENING. SOME OF THE STORMS MAY BE SEVERE WITH THE POTENTIAL TO
PRODUCE WIND GUSTS OVER 50 KNOTS AS WELL AS LARGE HAIL AND
FREQUENT LIGHTNING.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS FROM SUNDAY
THROUGH WEDNESDAY 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-
870-872-874-876-878-191745-
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-
1235 PM CDT FRI JUN 18 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
THUNDERSTORMS ARE LIKELY EITHER LATE THIS AFTERNOON OR THIS
EVENING. SOME OF THE STORMS MAY BE SEVERE WITH THE POTENTIAL TO
PRODUCE WIND GUSTS OVER 50 KNOTS AS WELL AS LARGE HAIL AND
FREQUENT LIGHTNING.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS FROM SUNDAY
THROUGH WEDNESDAY NIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
IZZISPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 104 PM CDT FRI JUN 18 2010 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 181930- WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK... WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO... OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...PONTIAC... WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...RENSSELAER... FOWLER 104 PM CDT FRI JUN 18 2010 /204 PM EDT FRI JUN 18 2010/ ...LINE OF SEVERE THUNDERSTORMS TO SWEEP ACROSS NORTHERN ILLINOIS THIS AFTERNOON... WHILE SKIES ARE SUNNY AND ITS HOT AND HUMID NOW...DON'T BE DECEIVED...A FAST MOVING LINE OF SEVERE THUNDERSTORMS WITH DAMAGING WINDS IS LIKELY TO RACE EASTWARD ACROSS NORTHERN ILLINOIS THIS AFTERNOON. CURRENT INDICATIONS ARE THAT THIS LINE WILL MOVE INTO THE ROCKFORD AND DIXON AREAS AROUND 230 PM OR 300 PM...INTO THE NORTHWESTERN SUBURBS OF CHICAGO SOUTHWEST INTO THE LASALLE PERU AREAS AROUND 330 PM...AND INTO THE GREATER CHICAGO METROPOLITAN AREA BETWEEN 4 AND 5 PM. THE LINE WILL MOVE INTO NORTHWEST INDIANA AFTER 5 PM. THIS LINE OF STORMS WILL APPROACH VERY RAPIDLY...SO THOSE WITH OUTDOOR PLANS SHOULD STAY VERY ALERT TO CHANGING CONDITIONS AND BE READY TO QUICKLY SEEK SHELTER WHEN THREATENING WEATHER APPROACHES. IZZI
The Quad Cities radar (KDVN), 95 km away, was scanning. The volume nearest the first event began at 19:23 UTC.
82 thunderstorm wind, 4 hail, 2 lightning, 1 flash flood. Local standard time, as filed.
Numerous trees, tree limbs and power lines were blown down in Dixon. A truck was blown over on Route 26 in Dixon.
Wind gusts were estimated to 60 mph.
A one foot diameter tree was snapped.
Numerous trees were blown down.
Tree limbs were blown down.
Nickel size hail was reported near Lake Summerset.
A wind gust to 72 mph was measured near Meridian Road and Route 20.
Roof damage was reported at a car dealership and at a country club.
Wind damage was reported in a large area of Rockford. Two large trees were blown down and a roof was blown off a house on Spring Lake Road. Four large trees were blown down at Route 2 and Gleasman Road. Trees were blown down and uprooted near Route 251 and Spring Creek Road. Numerous 6 to 12 inch tree limbs were blown near SpringBrook and Hickory Roads. ComEd reported 17,700 customers lost power.
Wind gusts were estimated to 65 mph at Route 251 and Reynolds Road.
A wind gust to 66 mph was estimated near Interstate 88 and Interstate 39.
Roof damage was reported to a building near Interstate 90 and Route 20.
Trees, tree limbs, and power lines were blown down in many areas of De Kalb, with wind gusts estimated as high as 70 mph. Gutter damage was reported on a house on the northwest side of De Kalb.
Wind gusts were estimated as high as 70 mph.
A wind gust was measured to 60 mph.
Quarter size hail was reported near Route 47 and Big Timber Road.
A semi truck was blown over on Interstate 90 north of Hampshire.
Wind gusts were estimated to 65 mph near Route 47 and Keslinger Road.
Trees and power lines were blown down with trees blocking some roads.
Trees were blown down blocking roads.
A one foot diameter tree was snapped off 10 feet above the ground. Three houses were damaged by falling limbs in Elgin.
Large trees and power lines were blown down near Riverside and 3rd Avenues.
Large trees were uprooted in Batavia. One of the trees fell onto a house.
Trees were blown down.
Tree limbs were blown down. A man was injured when a tree fell on his car. A woman was injured by a falling tree limb.
Wind gusts were estimated to 60 mph near Irving Park Road and Route 59.
Tree limbs and power lines were blown down.
Wind gusts were estimated to 70 mph near 75th Street and Lemont Road.
Wind gusts were estimated to 60 mph.
Tree limbs were blown down.
An 18 inch diameter tree limb was blown down near Lincoln and Fairview Avenues.
Six inch diameter tree limbs were blown down.
Five trees were blown down.
Numerous trees limbs were blown down near 75th Street and Cass Avenue.
A one foot diameter tree was blown down near 75th Street and Lyman Avenue.
A one foot diameter tree was snapped off at its base near Route 14 and Pepper Road.
Large trees were blown down on a house near Lombard Road and Army Trail Road.
A one foot diameter tree was snapped off at its base near Main Street and Route 176.
A semi truck was blown over near mile marker 227 on Interstate 55.
Thirty six trees were blown down or damaged.
Tree limbs were blown down blocking Midwest Road south of Interstate 88.
Six inch diameter tree limbs were blown down near Interstate 290 and North Avenue.
Numerous large trees were blown down across roads and some on houses.
One hundred trees were blown down or damaged. A man was injured by a falling tree limb.
Tree limbs and power lines were blown down. A power line sparked a fire at a resale shop.
Industrial buildings and a bowling alley sustained extensive roof damage. Several trees and utility poles were blown down. Some of the trees blocked roads and some trees fell onto houses.
Four inch diameter tree limbs were blown down.
One tree was uprooted and numerous tree limbs were blown down.
A multi-family residential building suffered roof damage.
Trees and tree limbs were blown down across west suburban Cook County. Some communities with tree damage included Elmwood Park, River Grove, Westchester, Oak Park, Norwood Park, Maywood, Bellwood, Hillside, Park Ridge, LaGrange, Brookfield, and Riverside. Trees and limbs fell on houses and cars. In Oak Park 60 trees were blown down. Maywood had 15 trees blown down. In LaGrange, part of a roof was blown off a house.
Six inch diameter tree limbs were blown down near 74th Avenue and 58th Place.
A line of thunderstorms moved east across the City of Chicago producing winds in excess of 60 mph. The City of Chicago Department of Streets and Sanitation received thousdands of reports of trees and limbs blown down, and light poles blown down across the city. The worst of the storm of the damage occurred on the south side of the city. A man and a woman were injured by falling tree limbs on the south side of Chicago. A 21 year old woman was struck by a falling tree limb in the Beverly area. She was in the hospital for five weeks before succumbing to her injuries on July 23rd.
A building near the Allstate Arena was damaged and a public works garage was damaged by wind.
A wind gust to 72 mph was measured near 87th Street and Pulaski Road.
A large tent was blown down on 15 people at Greek Fest. Three people were injured.
A large ash tree was blown down onto a house on Marengo Avenue. The tree caused significant damage to the roof, a bedroom and the porch.
A line of thunderstorms moved east across the city of Chicago, producing wind gusts in excess of 60 mph. The department of Streets and Sanitation received thousands of reports of trees and limbs down, and light poles blown down, throughout the city. The worst of the storm hit the central and south parts of the city. In downtown Chicago, windows were blow out of the 25th, 28th and 29th floor of the Willis Tower (formerly Sears Tower). A building in Block 37 at State Street and Randolph had 35 windows damaged. Pieces of concrete were knocked off the Aon Center.
Tree limbs were blown down near Southwest Highway and 53rd Court with estimated wind gusts to 75 mph.
Widespread tree damage was reported near 90th Street and Ridgeland Avenue. A flag pole was snapped off.
Trees and power lines were blown down.
Large tree limbs were blown down.
Trees and limbs were blown down. A woman lost control of her car due to falling power lines and limbs and crashed into a house. Winds blew down twenty eight 80 foot tall power poles on Touhy Avenue.
Large trees and large tree limbs were blown down with estimated wind gusts to 70 mph.
Lightning struck a house causing minor damage.
Lightning struck a house which started a fire. The house was engulfed in flames.
Wind gusts were estimated to 60 mph.
Wind gusts were measured to 70 mph near Route 394.
A tree was blown down on a car near Route 17 and Hobbie Avenue.
A one foot diameter tree was blown down.
A tree was blown down across a road. Power lines and a utility pole were also blown down.
Wind gusts estimated to 60 mph lasted for 10 minutes.
A tree was blown down.
An aluminum flag pole was blown down and a six inch diameter tree was blown down.
Several eight inch diameter tree limbs were blown down.
Wind gusts were estimated to 60 mph.
Wind gusts were estimated to 60 mph on the north side of Hoffman Estates.
A tree was blown down on Manchester Road.
Wind gusts were estimated to 60 mph.
Portions of Irving Park Road were reported flooded and closed.
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 |
|---|---|---|---|---|---|
| Thunderstorm Wind, Cook | 2010-07-23 | 21 | Female | Outside/Open Areas | Direct |
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, June 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: 240101, 240110, 240107, 240105, 240108, 240113, 240121, 240112, 240111, 240120, 240122, 240114, 240119, 240131, 240304, 240128, 240123, 240130, 240224, 240305, 240133, 240306, 240308, 240136, 240177, 240205, 240239, 240310, 240142, 240137, 240138, 240143, 240236, 240139, 240140, 240147, 240152, 240180, 243651, 240169, and more.