Illinois, 2001

Hail and Damaging Winds in Illinois, June 11, 2001

June 11, 2001 · NWS LOT · 11 events in 9 counties and zones

A large bow echo moved southeast from Wisconsin into northeast Illinois late on Monday June 11th. Wind speeds were measured as high as 84 mph in the city of Chicago at 2345 CST.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
1
Property damage
$22,000
Crop damage
None recorded
Events
11

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.

What happened

The episode as NWS LOT wrote it up.

A large bow echo moved southeast from Wisconsin into northeast Illinois late on Monday June 11th. Wind speeds were measured as high as 84 mph in the city of Chicago at 2345 CST. Most damage was in the form of trees and limbs down, as well as power lines and utility poles down. Locations where these reports were received include: Belvidere in Boone county; Antioch and Highland Park in Lake county; Woodstock, Cary, Fox River Grove, and Harvard in McHenry county; across all of Kane county; De Kalb in De Kalb County; Barrington, Palos Hills, and Chicago in Cook county; across all of Dupage county; and Naperville and Plainfield in Will county.A large tree limb fell on a parked car with one man sitting inside the car in Elgin in Kane county at 2240 CST. The man suffered only minor injuries, but the car suffered significant damage. A roof was blown off of a building in Franklin Park in Cook county at 2300 CST. Over 100,000 customers were reported to have lost their power in the greater Rockford area. Power outages were common across all of northeast Illinois.

What forecasters said that day

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 11, 8:18 PM CST, 1 hour 52 minutes earlier.

Area forecast discussion, Jun 11, 8:18 PM CST, 1 hour 52 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
918 PM CDT MON JUN 11 2001

ZONES UPDATED TO REFLECT SE TURN OF DEVELOPING BOW ECHO OVER C
WISCONSIN. STORMS SHOULD CONTINUE TO TURN SE AND MOVE ALONG/JUST NORTH
OF WARM FRONT AT 9 PM FROM AROUND LSE-JVL-ARR-VPZ. VERY UNSTABLE ON
WARM SIDE WITH 8 PM CAPES OVER 4000 AND SE SFC-6KM SHEAR VECTOR OF 65
KTS OVER SW WI. CORFIDI VECTORS SHOWED THIS TURN NICELY. IMMEDIATE
LAKE SHORE MAgY BE STABILIZED A BIT BY LAKE BREEZE.

AF

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

9 thunderstorm wind, 2 hail. Local standard time, as filed.

Thunderstorm Wind, Winnebago

When
June 11, 10:10 PM CST
Where
Winnebago County, South Beloit
Measured
61 kt (70 mph)
Reported by
EMERGENCY MANAGER
Coordinates
42.483, -89.033

Thunderstorm Wind, Boone

When
June 11, 10:10 PM CST
Where
Boone County, Belvidere
Measured
50 kt (58 mph)
Reported by
LAW ENFORCEMENT
Coordinates
42.250, -88.850

Thunderstorm Wind, Lake

When
June 11, 10:15 PM CST to 10:55 PM CST
Where
Lake County, Antioch
Measured
57 kt (66 mph)
Reported by
TRAINED SPOTTER
Coordinates
42.467, -88.100

Thunderstorm Wind, McHenry

When
June 11, 10:25 PM CST to 10:55 PM CST
Where
McHenry County, Woodstock
Measured
50 kt (58 mph)
Reported by
GENERAL PUBLIC
Coordinates
42.317, -88.450

Thunderstorm Wind, Kane

When
June 11, 10:30 PM CST to 11:05 PM CST
Where
Kane County, Countywide
Measured
50 kt (58 mph)
Injuries
1 direct, 0 indirect
Property damage
$7,000
Reported by
LAW ENFORCEMENT
Coordinates
41.917, -88.367

Thunderstorm Wind, De Kalb

When
June 11, 10:45 PM CST
Where
De Kalb County, De Kalb
Measured
50 kt (58 mph)
Reported by
LAW ENFORCEMENT
Coordinates
41.933, -88.750

Thunderstorm Wind, Cook

When
June 11, 10:55 PM CST to 11:59 PM CST
Where
Cook County, Barrington
Measured
73 kt (84 mph)
Property damage
$15,000
Reported by
GENERAL PUBLIC
Coordinates
42.150, -88.133

Thunderstorm Wind, Du Page

When
June 11, 11:00 PM CST to 11:35 PM CST
Where
Du Page County, Countywide
Measured
52 kt (60 mph)
Reported by
EMERGENCY MANAGER
Coordinates
41.817, -88.083

Hail, Du Page

When
June 11, 11:05 PM CST
Where
Du Page County, Carol Stream
Measured
1.25 in hail
Reported by
GENERAL PUBLIC
Coordinates
41.917, -88.133

Thunderstorm Wind, Will

When
June 11, 11:11 PM CST to 11:40 PM CST
Where
Will County, Naperville
Measured
57 kt (66 mph)
Reported by
NWS EMPLOYEE(OFF DUTY)
Coordinates
41.783, -88.150

Hail, Cook

When
June 11, 11:20 PM CST
Where
Cook County, Chicago
Measured
0.75 in hail
Reported by
TRAINED SPOTTER
Coordinates
41.833, -87.650

What these are

Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Illinois in 2001Every state in 2001This day in weather historyWarnings in Illinois, June 2001

Sources

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: 5255572, 5255573, 5255574, 5255575, 5255576, 5255577, 5255578, 5255579, 5255582, 5255581, 5255580.