1 thunderstorm wind, 1 hail, as filed by the National Weather Service.
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 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 6, 1:00 PM CST, 2 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 200 PM CDT SUN JUL 6 2003 DISCUSSION FOR AFTERNOON GRIDS AND ZONES... SVR WX IN PROGRESS. SEE SWODY1 AND HWOLOT FOR DETAILS ON TSTM DVLPMT NXT 18 HRS. HAVE CHGD LTL IN GRIDS/ZONES XCP FOR WED-THU. HAVE INTODUCED MENTION OF PRECIP THIS PERIOD BASED ON 12Z MDL RUNS BRINGING ANOTHER COUPLE OF SHORT WAVES THRU NWLY H5 FLO DURG THIS PERIOD. OTRW LTL CHG TO FCST. .CHI...NONE MERZLOCK
ILZ003>006-008-010>014-019-020>023-032-033-039-INZ001-002-010-011-019
-071100-
HAZARDOUS WEATHER OUTLOOK/SUPPLEMENTAL
NATIONAL WEATHER SERVICE CHICAGO IL
1100 AM CDT SUN JUL 6 2003
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
ILLINOIS...NORTHWEST INDIANA...AND THE ADJACENT WATERS OF LAKE
MICHIGAN.
.DAY ONE... THIS AFTERNOON AND TONIGHT
A WATCH BOX WILL BE ISSUED FOR THE ENTIRE AREA AROUND NOON.
FOLLOWING A LULL IN ACTIVITY THIS EVENING...THERE IS A MODERATE RISK
OF SEVERE THUNDERSTORMS AFTER MIDNIGHT IN AREAS NORTH OF ABOUT I
80...AND A SLIGHT RISK OF SEVERE STORMS SOUTH OF I 80.
DAMAGING WINDS WILL BE THE MAIN THREAT THIS AFTERNOON WITH ISOLATED
SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL AND TORNADOES.
THE PRIMARY THREAT TONIGHT WILL BE DAMAGING WINDS AND LARGE HAIL.
A MESOSCALE STORM SYSTEM OVER NORTHEAST IOWA LATE THIS MORNING
WILLBE TRACKING EASTWARD ACROSS SOUTHERN WISCONSIN THIS AFTERNOON.
AS IT DOES SO IT WILL BE MOVING INTO VERY UNSTABLE AIR OVER NORTHERN
ILLINOIS AND NORTHWEST INDIANA. DUE TO THE DEGREE OF INSTABILITY IN
PLACE...WITH SURFACE TEMPERATURES AROUND 90 AND DEW POINTS IN THE
LOWER AND MIDDLE 70S...SOME SUPERCELLS ARE POSSIBLE. WIND SHEAR
THROUGH THE MID LEVELS OF THE ATMOSPHERE MAY PROVIDE AN ENVIRONMENT
FAVORABLE FOR ROTATION.
ANOTHER MESOSCALE WEATHER SYSTEM IS EXPECTED TO BLOW UP THIS
AFTERNOON AND EVENING AHEAD OF A COLD FRONT IN MINNESOTA AND TRACK
SOUTHEAST INTO OUR AREA AFTER MIDNIGHT.
.DAYS TWO THROUGH SEVEN... MONDAY THROUGH SATURDAY
TEMPERATURES REACHING THE MID 90S...AND DEWPOINTS INTO THE 70S WILL
COMBINE TO PRODUCE HEAT INDICES APPROACHING 105 IN SOME AREAS.
PERIODS OF THUNDERSTORMS ARE LIKELY INTO WEDNESDAY MORNING. SOME OF
THESE MAY BE SEVERE WITH ADDITIONAL HEAVY RAIN. DRIER AND COOLER
AIR IS EXPECTED LATER WEDNESDAY THROUGH FRIDAY. MORE THUNDERSTORMS
ARE POSSIBLE SATURDAY.
SPOTTER ACTIVATION IS LIKELY THIS AFTERNOON AND MAY BE NEEDED AGAIN
LATE TONIGHT...AFTER MIDNIGHT.
&&
NWS CHICAGO WEBPAGE
HTTP://WWW.CRH.NOAA.GOV/LOT (LOWER CASE)
OR HTTP://WEATHER.NOAA.GOV/CHICAGO (LOWER CASE)
MERZLOCKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
146 PM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0130 PM 2 W KANKAKEE IL .75 INCH HAIL
07/06/03 KANKAKEE REPORTED BY PUBLIC.
0143 PM KANKAKEE IL .75 INCH HAIL
07/06/03 KANKAKEE REPORTED BY HAM RADIO
OPERATOR.
0143 PM BRADLEY IL .75 INCH HAIL
07/06/03 KANKAKEE REPORTED BY HAM RADIO
OPERATOR.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
156 PM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1239 PM 3 W KANKAKEE IL 1 INCH HAIL
07/06/03 KANKAKEE HAIL LASTED 2-3
MINUTES. REPORTED BY
LAW ENFORCEMENT OFFICIAL.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
205 PM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0155 PM WOODSTOCK IL .75 INCH HAIL
07/06/03 MCHENRY REPORTED BY COOPERATIVE
OBSERVER.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
207 PM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0159 PM ARLINGTON HGTS IL 1 INCH HAIL
07/06/03 COOK ARLINGTON HGTS &
DUNDEE. REPORTED BY
STORM SPOTTER.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
305 PM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0150 PM BRADLEY IL .75 INCH HAIL
07/06/03 KANKAKEE REPORTED BY STORM
SPOTTER.
0155 PM WOODSTOCK IL .75 INCH HAIL
07/06/03 MCHENRY REPORTED BY COOPERATIVE
OBSERVER.
0159 PM ARLINGTON HGTS IL 1 INCH HAIL
07/06/03 COOK REPORTED BY STORM
SPOTTER.
0204 PM BUFFALO GROVE IL 1.75 INCH HAIL
07/06/03 LAKE REPORTED BY HAM RADIO
OPERATOR.
0205 PM WHEELING IL 1.75 INCH HAIL
07/06/03 COOK DAMAGE TO POLICE CARS
AND OTHER VEHICLES.
WINDSHIELD BLOWN ON A
CITIZEN/S CAR.
0206 PM WHEELING IL 1 INCH HAIL
07/06/03 COOK QUARTER SIZE HAIL AT
DUNDEE & MILWUAKEE RDS.
REPORTED BY HAM RADIO
OPERATOR.
0210 PM WOODSTOCK IL 1 INCH HAIL
07/06/03 MCHENRY REPORTED BY EMERGENCY
MANAGEMENT.
0223 PM 3 NW MORRIS IL .88 INCH HAIL
07/06/03 GRUNDY REPORTED BY EMERGENCY
MANAGEMENT.
0233 PM OTTAWA IL 1 INCH HAIL
07/06/03 LASALLE REPORTED BY HAM RADIO
OPERATOR.
0233 PM OTTAWA IL 60 MPH TSTM GUST
07/06/03 LASALLE REPORTED BY HAM RADIO
OPERATOR.
0233 PM MAZON IL .75 INCH HAIL
07/06/03 GRUNDY REPORTED BY HAM RADIO
OPERATOR.
0238 PM OTTAWA IL WIND DAMAGE
07/06/03 LASALLE N SIDE OF OTTAWA. CORN
CROPS DOWN. LIMBS IN
STREET.
0242 PM WAUCONDA IL 1.75 INCH HAIL
07/06/03 LAKE AT INTERSECTION OF
GILMER & FAIRFIELD.
REPORTED BY STORM
SPOTTER.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
332 PM CDT SUN JUL 06 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0223 PM OTTAWA IL 1.75 INCH HAIL
07/06/03 LASALLE *** 1 INJ ***
AT INTERSECTION OF
CHAMBERS AND GLOVER ST.
PERSON HIT ON HEAD. .
REPORTED BY PUBLIC.
0235 PM OTTAWA IL .75 INCH HAIL
07/06/03 LASALLE REPORTED BY LAW
ENFORCEMENT OFFICIAL.
0248 PM 1 N MARSEILLES IL .75 INCH HAIL
07/06/03 LASALLE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
0253 PM MAZON IL 1 INCH HAIL
07/06/03 GRUNDY REPORTED BY HAM RADIO
OPERATOR.
0257 PM BRACEVILLE IL .75 INCH HAIL
07/06/03 GRUNDY REPORTED BY FIRE AND
RESCUE.
0257 PM MAZON IL .75 INCH HAIL
07/06/03 GRUNDY ACCUMULATION COVERING
GROUND. REPORTED BY HAM
RADIO OPERATOR.
0257 PM OTTAWA IL .75 INCH HAIL
07/06/03 LASALLE HAIL COVERING GROUNDAT
2 INCH DEPTHS. REPORTED
BY HAM RADIO OPERATOR.
0257 PM OTTAWA IL FLOOD
07/06/03 LASALLE STREET FLOODING.
REPORTED BY HAM RADIO
OPERATOR.
0300 PM ROMEOVILLE IL .75 INCH HAIL
07/06/03 WILL WEBER RD & AIRPORT RD.
. REPORTED BY STORM
SPOTTER.
0303 PM 8 S MAZON IL 1 INCH HAIL
07/06/03 GRUNDY REPORTED BY FIRE AND
RESCUE.
0306 PM PLAINFIELD IL 1.25 INCH HAIL
07/06/03 WILL INTERSECTION OF I55 &
PLAINFIELD RD. .
REPORTED BY HAM RADIO
OPERATOR.
0310 PM MAZON IL .75 INCH HAIL
07/06/03 GRUNDY HAIL COVERING GROUND. .
REPORTED BY EMERGENCY
MANAGEMENT.
0310 PM BOLINGBROOK IL 1 INCH HAIL
07/06/03 WILL I55 AND WEBER RD.
REPORTED BY STORM
SPOTTER.
0310 PM ESSEX IL 1.25 INCH HAIL
07/06/03 KANKAKEE REPORTED BY HAM RADIO
OPERATOR.
0315 PM 1 N ESSEX IL 1.75 INCH HAIL
07/06/03 KANKAKEE REPORTED BY FIRE AND
RESCUE.
0315 PM LAKE BLUFF IL 1.75 INCH HAIL
07/06/03 LAKE REPORTED BY LAW
ENFORCEMENT OFFICIAL.The Chicago radar (KLOT), 66 km away, was scanning. The volume nearest the first event began at 21:13 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
A spotter reported a 60 mph gust at Route 41. A power pole was blown down in Schneider.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2003Every state in 2003This day in weather historyWarnings in Indiana, July 2003
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: 5370864, 5370865.