EF1 tornado, Cook County, Illinois, July 27, 2026

1. EF065 to 85 mph

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

2. EF186 to 110 mphthis tornado

   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.

Rating, as surveyed

EF1, preliminary

Date

July 27, 2026

Touchdown

12:47 PM CDT (17:47 UTC)

Lifted

1:03 PM CDT (18:03 UTC)

On the ground

16 minutes

Path length

11.4 miles (18.4 km)

Path width

200 yards (183 m)

Deaths

0

Injuries

12

County

Cook County

Touchdown point

41.577, -87.740

Lift-off point

41.547, -87.624

Highest wind the damage implies

110 mph

Surveyed by

NWS LOT

The office's name for it

Country Club Hills - Glenwood

Survey last edited

August 8, 2026

Record number

None yet. SPC numbers 2026 in the spring of 2027.

This tornado appeared to start just east of Interstate 57 and moved eastward, crossing Interstate 80 on the northwest side of Country Club Hills. The tornado then progressed east-northeastward through Hazel Crest, downing trees and tree limbs and removing roofing material off of multiple apartment buildings along 171st Street. After crossing Interstate 80 again at the junction with Interstate 294, the tornado made an unusual counter-clockwise loop as it tracked into the east side of Markham and then the southwest side of Harvey, causing primarily tree and cosmetic structure damage. After reaching its northernmost point between W 154th Street and W 155th Street, the tornado looped back southward, rapidly accelerating as it re-entered Markham and Hazel Crest. The tornado reached its peak intensity here, removing the roof of an industrial building on W 167th Street and causing exterior wall and roof damage to an apartment complex on 171st Street. After crossing Interstate 80 for a third time, the tornado continued southeastward through the north and east sides of Homewood. There, four double-stacked intermodal containers weighing approximately 75 tons each were tipped over in a rail yard, and numerous additional trees were damaged. The tornado caused more tree damage on the northwest side of Glenwood before dissipating near the Glenwood Academy. There were 12 injuries reported associated with the tornado.

Written by NWS LOT in the NWS Damage Assessment Toolkit. A survey is revised as better evidence arrives.

274 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 110 mph.

• Total loss of roof to industrial buildings.
• Power lines broken south of 171st St.
• Structural damage to home in 8700 block of 167th St.
• I-80 at Kedzie closed due to downed power line

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

37 minutes of warning. NWS LOT issued a tornado warning for this county at 17:10 UTC, 37 minutes before the tornado touched down, in force until 17:56 UTC.

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 Storm Prediction Center had this point in a Enhanced Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 16:49 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 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.

The Chicago radar (KLOT), 34 km away, was scanning. The volume nearest the touchdown began at 17:48 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.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2026 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

9 more have been surveyed in the United States that day, so far.

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. A survey can be revised, so the rating, the path and the casualties can all still change.

NWS Damage Assessment Toolkit, the record the survey teams file from the damage, and NOAA Storm Prediction Center storm reports. Neither is the official database for 2026, which SPC publishes in the spring of 2027.