Tornadoes · United States · Illinois · 2024

EF0 tornado, Peotone to Eagle Lake, Illinois, July 15, 2024

From Peotone to Eagle Lake, this EF0 tornado ran 6.4 miles across Will County on July 15, 2024, touching down at 9:41 PM CDT and reaching 100 yards wide. It killed nobody.

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.

  1. EF065 to 85 mphthis tornado

    Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

  2. EF186 to 110 mph

    Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

  3. 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.

  4. 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.

  5. EF4166 to 200 mph

    Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

  6. 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.

  7. 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
July 15, 2024
Touchdown
9:41 PM CDT (02:41 UTC)
Lifted
9:46 PM CDT (02:46 UTC)
On the ground
5 minutes
Path length
6.4 miles (10.3 km)
Path width
100 yards (91 m)
Deaths
0
Injuries
0
County
Will County
Touchdown point
41.308, -87.787
Lift-off point
41.327, -87.668
Record number
2407152041-01

The damage survey

310 damage points were recorded along this path by NWS LOT, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EFU. The highest wind the damage implies is 100 mph.

  • Multiple large branches downed in vicinity. Most at curb.
  • Tree branches downed. AC unit pushed to SE.
  • Damage tobshingles and siding of multiple residences. Occupant in basement felt pressure changes in ears. Damage mostly to west and south sides.
  • Tree uprooted to NE. Resident mentioned distinct roaring and rattling of windows.

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

What the Weather Service recorded

A derecho moved across northern Illinois during the evening of July 15th producing widespread wind damage and 30 tornadoes in northeast Illinois. One of these tornadoes crossed into northwest Indiana. At the height of the storms, 430,000 customers lost power with some power not restored for four days, on July 19th.

A tornado with estimated peak winds of 85 mph touched down near the intersection of Drecksler Road and Kennedy Road where numerous large tree limbs were blown down. The tops of approximately 20 trees were sheared off about a quarter mile south of Kennedy Road. The tornado tracked nearly due east along Kennedy Road producing tree damage until it crossed Egyptian Trail where it turned to the northeast. A collapsed outbuilding and broken windows were observed to two homes near Egyptian Trail. The tornado continued producing tree damage and caused significant roof damage to a house on Will Center Road. The tornado began moving to the east near Crawford Avenue and Corning Road, producing significant tree damage in this area. Shingles were blown off a roof and a chicken coop was destroyed along Corning Road, just west of Western Avenue. The tornado then ended east of Western Avenue.

A tornado with estimated peak winds of 90 mph touched down west of Yates Avenue, southwest of Eagle Lake where several trees and an outbuilding were damaged. The tornado moved northeast and crossed into Lake County in northwest Indiana south of Brunswick Road.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

What forecasters said that day

The local office's own words before the tornado touched down, 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 tornado touched down at Jul 15, 6:43 PM CDT, 2 hours 58 minutes earlier. Its key messages:

  • Strong to severe thunderstorms expected late this afternoon into tonight. Locally heavy rainfall possible, which could lead to additional flooding.
  • Additional thunderstorm chances continue Tuesday, mainly south of I-80/east of I-55.
  • Pattern breaks by Wednesday, with dry weather and seasonable temperature and humidity through the weekend.
Area forecast discussion, Jul 15, 6:43 PM CDT, 2 hours 58 minutes before
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
643 PM CDT Mon Jul 15 2024

.KEY MESSAGES...

- Strong to severe thunderstorms expected late this afternoon
  into tonight. Locally heavy rainfall possible, which could
  lead to additional flooding.

- Additional thunderstorm chances continue Tuesday, mainly
  south of I-80/east of I-55.

- Pattern breaks by Wednesday, with dry weather and seasonable
  temperature and humidity through the weekend.

&&

.MESOSCALE...
Issued at 546 PM CDT Mon Jul 15 2024

Explosive severe thunderstorm development has taken place across
Iowa, with storm tops exceeding 65kft. Special soundings from
DVN and ILX both show extreme instability and moderate deep
layer shear, though sufficient shear to support storm scale
organization in light of the extreme instability.

Already seeing signs of amalgamating cold pools/downdrafts with
convection over Iowa with radar showing some developing rear
inflow jets. The evolution of the convection so far continues to
fit the expectations for today with evolution to QLCS well
underway. As cold pool strengthens, would anticipate a QLCS to
begin accelerating eastward with increasing damaging wind threat
as storms approach and cross the Mississippi River.

Strengthening low level jet this evening over northern Illinois
should result in a ramping up of low level shear and coincident
increasing threat of QLCS tornadoes with bowing segments and/or
line embedded supercells. Given the shear/instability combo,
threat is certainly there for a large number of QLCS tornadoes
this evening over northern IL.

Recent satellite/radar imagery shows some cells developing over
far northern Winnebago County near the Wisconsin line. This
could be the beginnings of a "warm air advection" wind ahead of
the Iowa QLCS, which if it is and continues to fill in this
could result in a potential significant/high end flash flood
threat in our CWA if storms drift south of the IL/WI border.
Given the vulnerability of the Rockford area due to nearly 10"
of rain over the past 48 hours, this will be something that we
will be monitoring extremely closely.

- Izzi

&&

.DISCUSSION...
Issued at 247 PM CDT Mon Jul 15 2024

Through Tuesday Night:

Showers and storms may linger into the morning hours, especially
across the southern portion of the CWA. There is a chance that
the cold front associated with the storms may set up in a west
to east fashion and stall out across the southern portion of the
area, which could lead to storms persisting into the evening
over this area. However, most of the 12Z CAMs show this scenario
playing out south of the area. Although the chances of this
seem to be on the lower side, did include chance PoPs across the
southern CWA through Tuesday afternoon to account for this
possibility.

With the cold front moving through the area, Tuesday will be
cooler than today with temperatures in the mid-to-upper 80s.
Dew points will still be around 70 degrees, so it may still feel
a bit on the humid side, but peak heat indices will only be in
the 90-95 degree range.

Carothers

Wednesday through Monday:

The main upper trough axis is expected to shift east across the
forecast area Wednesday. Despite steep low-level lapse rates
depicted in forecast soundings, warm mid-level temps (700-600
mb) look to provide a capping inversion with respect to surface
based convective development. Therefore, forecast for Wednesday
is dry at this point. Broad surface high pressure then builds
across the area through the end of the week, setting the stage
for a well-deserved period of dry and seasonably mild but less-
humid weather conditions, downstream of a high-amplitude upper
ridge which develops over western North America.

Ratzer

&&

.AVIATION /00Z TAFS THROUGH 06Z WEDNESDAY/...
Issued by National Weather Service Gaylord, MI
643 PM CDT Mon Jul 15 2024

The primary aviation weather concerns for the 18Z TAF period include:

* Severe squall line this evening

* Period of MVFR ceilings (at least?) ahead of and behind a cold
  front expected to pass through in the 12z-18z time frame.

QLCS has developed as expected and pressing across the Mississippi
River as of this writing.  Storms expected to reach KRFD around 01z
and into the Chicago metro in the 02-03z time frame with strong wind
gusts in excess of 40 knots anticipated.  Still looks to be a period
of MVFR ceilings in the wake of this evening's convection into
Tuesday morning though flight conditions are expected to improve
toward midday with a wind shift to the northwest behind a cold front
(and likely a lake breeze impacting KORD/KMDW during the afternoon).

JPB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Flood Watch until 3 AM CDT Tuesday for ILZ003-ILZ004-ILZ005-
     ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-ILZ013-ILZ019-ILZ020-
     ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-ILZ103-ILZ104-ILZ105-
     ILZ106-ILZ107-ILZ108.

     Heat Advisory until 7 PM CDT this evening for ILZ008-ILZ010-
     ILZ011-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-
     ILZ106-ILZ107-ILZ108.

IN...Flood Watch until 3 AM CDT /4 AM EDT/ Tuesday for INZ001-
     INZ002-INZ010-INZ011-INZ019.

LM...None.

&&

Visit us at weather.gov/chicago
Hazardous weather outlook, Jul 15, 3:42 PM CDT, 5 hours 59 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
342 PM CDT Mon Jul 15 2024

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-162045-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
342 PM CDT Mon Jul 15 2024 /442 PM EDT Mon Jul 15 2024/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Level 3 of 5 Tornado Risk.
     Level 4 of 5 Damaging Wind Risk...up to 80 mph.
     Level 1 of 5 Hail Risk...up to quarter size.
     Level 3 of 4 Flash Flooding Risk.

DISCUSSION...

Strong to severe thunderstorms are expected to move across the
area this evening. Damaging winds and tornadoes are expected to
be the primary severe hazards. In addition, thunderstorms will
produce torrential rainfall which will likely result in flash
flooding, possibly significant in a few areas.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Limited Thunderstorm Risk mainly south of I-80.

DISCUSSION...

Scattered thunderstorms are possible again on Tuesday afternoon,
primarily near and south of I-80.

.SPOTTER INFORMATION STATEMENT...

  Spotters will likely be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-southeast at 40 to 45 mph.

LMZ740>745-162045-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
342 PM CDT Mon Jul 15 2024

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Level 3 of 5 Thunderstorm Waterspout Risk
     Level 4 of 5 Thunderstorm Wind Gust Risk...up to 70 knots.
     Level 1 of 5 Hail Risk...up to quarter size.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Limited Thunderstorm Risk mainly risk southeast of Chicago.

Carothers

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In the hours before

Local storm report, Jul 15, 8:20 PM CDT, 1 hour 21 minutes before
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Local storm report, Jul 15, 8:30 PM CDT, 1 hour 11 minutes before
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Local storm report, Jul 15, 9:01 PM CDT, 40 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
901 PM CDT Mon Jul 15 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0828 PM     Tstm Wnd Gst     2 NW Sycamore           42.02N 88.71W
07/15/2024  M58 MPH          De Kalb            IL   Mesonet

&&

sb
Local storm report, Jul 15, 9:02 PM CDT, 39 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
902 PM CDT Mon Jul 15 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0832 PM     Tstm Wnd Gst     3 N Sycamore            42.04N 88.68W
07/15/2024  M60 MPH          De Kalb            IL   Mesonet

&&

sb
Local storm report, Jul 15, 9:07 PM CDT, 34 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
907 PM CDT Mon Jul 15 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0857 PM     Tstm Wnd Gst     2 WNW Sugar Grove       41.77N 88.48W
07/15/2024  M70 MPH          Kane               IL   ASOS

            ASOS measured 61 kt gust at Aurora Municipal
            Airport (KARR).

&&

Ratzer
Local storm report, Jul 15, 9:41 PM CDT, 0 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
941 PM CDT Mon Jul 15 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0904 PM     Tstm Wnd Dmg     Oswego                  41.68N 88.36W
07/15/2024                   Kendall            IL   Emergency Mngr

            5-6 inch trees down.

&&

sb

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

2.7 hours before the tornado, 149 km from the path. July 16, 2024.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2024-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 3169 joules per kilogram, CIN -39, lifted condensation level 1385 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Lincoln, IL at 00:00Z on 2024-07-16The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 161 square meters per square second, 0 to 6 km bulk shear 30 knots.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
3169 J/kg
Mixed-layer CIN
-39 J/kg
Surface CAPE
5530 J/kg
Mixed-layer LCL
1385 m above ground
0-6 km bulk shear
30 kt
0-1 km bulk shear
24 kt
0-1 km storm-relative helicity
161 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
1.7
Supercell composite
22.3
0-3 km lapse rate
6.5 K/km

Open this sounding in Storm Lab

Lincoln, IL (KILX), 12:00Z

9.3 hours after it, 149 km from the path. July 16, 2024.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2024-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 675 joules per kilogram, CIN -163, lifted condensation level 819 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Lincoln, IL at 12:00Z on 2024-07-16The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 179 square meters per square second, 0 to 6 km bulk shear 42 knots.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
675 J/kg
Mixed-layer CIN
-163 J/kg
Surface CAPE
14 J/kg
Mixed-layer LCL
819 m above ground
0-6 km bulk shear
42 kt
0-1 km bulk shear
25 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0
0-3 km lapse rate
3.5 K/km

Open this sounding in Storm Lab

The surface observations

Kankakee (IKK), 29 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
00:00 UTC

From the Iowa Environmental Mesonet's archive of airport observations.

The radar

The Chicago radar (KLOT), 44 km away, was scanning. The volume nearest the touchdown began at 02:40 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.

This ground now

The live radar over the trackEvery 2024 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

The other tornadoes of July 15, 2024

61 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
July 157:14 AM CDTEF0Chippewa, MN2.225
July 153:50 PM EDTEF0Genesee, NY0.875
July 154:48 PM EDTEF0Ontario, NY0.875
July 156:25 PM EDTEF0Cortland, NY7.5175$37,000
July 155:37 PM CDTEF1Polk, IA6.9300$500,000
July 156:54 PM EDTEF1Chenango, NY8.7250$120,000
July 156:14 PM CDTEF1Grant, WI0.330$35,000
July 156:18 PM CDTEF0Jones, IA1.550
July 156:40 PM CDTEF1Jo Daviess, IL29.8100
July 156:48 PM CDTEF1Jo Daviess, IL8.150
July 156:50 PM CDTEF2Jo Daviess, IL15.4150
July 157:02 PM CDTEF0Muscatine, IA to IL3.050
July 157:17 PM CDTEF1Rock Island, IL24.7100
July 157:19 PM CDTEF1Scott, IA to IL8.0100
July 157:26 PM CDTUnratedStephenson, IL1.010
July 157:26 PM CDTEF0Rock, WI1.250
July 157:44 PM CDTEF0Ogle, IL5.3200
July 157:58 PM CDTEF0Ogle, IL1.7150
July 157:58 PM CDTEF0Winnebago, IL1.2100
July 158:01 PM CDTEF0Winnebago, IL0.225
July 158:02 PM CDTEF1Henry, IL5.2200$100,000
July 158:05 PM CDTEF0Ogle, IL2.2150
July 158:07 PM CDTEF1Knox, IL1.3150
July 158:07 PM CDTEF1Henry, IL1.750$50,000
July 158:15 PM CDTEF0Peoria, IL4.380
July 158:21 PM CDTEF1Peoria, IL2.4150
July 158:25 PM CDTEF0Peoria, IL2.5100
July 158:36 PM CDTEF1Woodford, IL0.4100
July 158:38 PM CDTEF0Woodford, IL1.480
July 158:38 PM CDTUnratedDeKalb, IL1.850
July 158:39 PM CDTEF1Woodford, IL1.2100
July 158:39 PM CDTEF1Tazewell, IL12.2100
July 158:49 PM CDTEF1Kane, IL8.4300
July 158:51 PM CDTUnratedTazewell, IL0.980
July 158:52 PM CDTEF0Kane, IL10.1250
July 158:55 PM CDTEF1Kendall, IL19.2200
July 158:55 PM CDTEF0Woodford, IL3.830
July 159:06 PM CDTEF1Kendall, IL19.52502
July 159:09 PM CDTEF2Grundy, IL34.63252
July 159:10 PM CDTEF0Kendall, IL17.0300
July 159:23 PM CDTEF0DuPage, IL3.1150
July 159:29 PM CDTEF0DuPage, IL0.850
July 159:33 PM CDTEF0Will, IL2.9300
July 159:34 PM CDTEF0DuPage, IL4.1250
July 159:35 PM CDTEF0Kankakee, IL12.3275
July 159:36 PM CDTEF0Cook, IL1.2175
July 159:37 PM CDTEF1Cook, IL2.175
July 159:41 PM CDTEF0Cook, IL5.7300
July 159:43 PM CDTEF1Cook, IL5.5250
July 159:43 PM CDTEF0Cook, IL0.485
July 159:45 PM CDTEF0Cook, IL0.4125
July 159:47 PM CDTEF1Cook, IL3.2150
July 159:47 PM CDTEF1Cook, IL3.1400
July 159:50 PM CDTEF0Cook, IL1.4150
July 159:51 PM CDTEF1Kankakee, IL2.6100
July 159:52 PM CDTEF1Lake, IL to IN29.1300
July 159:58 PM CDTEF0Lake, IN2.4100
July 1510:02 PM CDTEF0Lake, IN16.4100
July 1510:32 PM CDTEF1LaPorte, IN3.275$100,000
July 1512:09 AM EDTEF0Marshall, IN0.775$20,000

All 62 of them

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.