Tornadoes · United States · Illinois · 2015
EF0 tornado, DuPage County, Illinois, August 18, 2015
This EF0 tornado ran 0.2 miles across DuPage County on August 18, 2015, touching down at 8:06 PM CDT and reaching 75 yards wide. It killed nobody, and did $50,000 of property damage.
The rating scale
Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
EF065 to 85 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
EF2111 to 135 mph
Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.
EF3136 to 165 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
EF5over 200 mph
Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.
Unrated
The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.
The record
- Rating
- EF0
- Date
- August 18, 2015
- Touchdown
- 8:06 PM CDT (01:06 UTC)
- Lifted
- 8:07 PM CDT (01:07 UTC)
- On the ground
- 1 minutes
- Path length
- 0.2 miles (0.4 km)
- Path width
- 75 yards (69 m)
- Deaths
- 0
- Injuries
- 0
- Property damage
- $50,000
- County
- DuPage County
- Touchdown point
- 41.798, -88.014
- Lift-off point
- 41.802, -88.015
- Record number
- 1508181906-01
The damage survey
15 damage points were recorded along this path by NWS LOT, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 80 mph.
Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.
The warnings
1 minute of warning. NWS LOT issued a tornado warning for this county at 01:05 UTC, 1 minute before the tornado touched down, in force until 01:30 UTC.
The county was under a tornado watch, issued at 21:41 UTC and running to 02:08 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 21:41 UTC | 02:08 UTC | Tornado Watch | LOT |
| 01:05 UTC | 01:30 UTC | Tornado Warning | LOT |
| 01:11 UTC | 03:13 UTC | Flash Flood Warning | LOT |
Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.
The forecast that day
The Storm Prediction Center had this point in a General Thunderstorms Risk. The outlook in force was issued at 01:00 UTC.
SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.
The air that afternoon
The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.
Lincoln, IL (KILX), 00:00Z
1.1 hours before the tornado, 190 km from the path. August 19, 2015.
- Mixed-layer CAPE
- 11 J/kg
- Mixed-layer CIN
- -144 J/kg
- Surface CAPE
- 155 J/kg
- Mixed-layer LCL
- 1084 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 5.0 K/km
Lincoln, IL (KILX), 12:00Z
10.9 hours after it, 190 km from the path. August 19, 2015.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- -81264 J/kg
- Surface CAPE
- 0 J/kg
- Mixed-layer LCL
- 994 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 4.3 K/km
The radar
The Chicago radar (KLOT), 22 km away, was scanning. The volume nearest the touchdown began at 01:07 UTC.
Open the radar archive at this moment, over the track
Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 00:55 UTC | TORNADO | 2 Nw Bolingbrook | Will, IL | EF-0 TORNADO WITH MAXIMUM WINDS OF 70-80 MPH...PATH LENGTH OF 3.01 MILES AND PATH WIDTH OF 50-75 YARDS TRACKED FROM EXTREME SOUTHEAST NAPERVILLE TO EASTERN WOODRIDGE. SEVERAL HARDWOOD TREES SNAPPED OR DAMAGED AND A SOFTW |
| 01:01 UTC | FLOOD | Willowbrook | Dupage, IL | AT IL-83 AND 63RD ST. 3 INCHES OF WATER ACROSS ENTIRE ROAD WITH 6 INCHES ON ONE SIDE. |
| 01:05 UTC | TSTM WND DMG | 1 Sw Woodridge | Will, IL | SEVERAL 2-4 INCH BRANCHES DOWN AND 18-20 INCH TREE TOP SNAPPED OFF IN GREEN VALLEY FOREST PRESERVE. TIME ESTIMATED. |
| 01:06 UTC | TORNADO | Ene Downers Grove | Dupage, IL | BRIEF...WEAK EF-0 TORNADO WITH MAXIMUM WINDS OF 65-70 MPH...PATH LENGTH OF 0.25 MILES AND PATH WIDTH OF 50-75 YARDS. A FEW HARDWOOD TREES SNAPPED...ONE SNAPPED A POWERPOLE AND CAUSED MINOR GARAGE DAMAGE AND OTHER CRUSHED |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2015 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are
The other tornadoes of August 18, 2015
8 more were confirmed in the United States that day.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| August 18 | 3:13 PM CDT | EF0 | Cedar, IA | 0.1 | 20 | |||
| August 18 | 4:32 PM CDT | EF0 | Livingston, IL | 0.0 | 25 | |||
| August 18 | 5:05 PM CDT | EF0 | Livingston, IL | 0.0 | 25 | |||
| August 18 | 6:09 PM CDT | EF0 | Tazewell, IL | 2.0 | 75 | $30,000 | ||
| August 18 | 7:55 PM CDT | EF0 | DuPage, IL | 3.2 | 75 | |||
| August 18 | 8:56 PM CDT | EF1 | Walworth, WI | 4.9 | 75 | $100,000 | ||
| August 18 | 9:25 PM CDT | EF1 | Waukesha, WI | 2.5 | 50 | $46,000 | ||
| August 18 | 9:50 PM CDT | EF0 | Waukesha, WI | 0.6 | 25 | $10,000 |
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.