EF0 tornado, Mackinaw to Lilly, Illinois, August 18, 2015

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.

Rating

EF0

Date

August 18, 2015

Touchdown

6:09 PM CDT (23:09 UTC)

Lifted

6:11 PM CDT (23:11 UTC)

On the ground

2 minutes

Path length

2.0 miles (3.2 km)

Path width

75 yards (69 m)

Deaths

0

Injuries

0

Property damage

$30,000

Crop damage

$8,000

County

Tazewell County

Touchdown point

40.526, -89.323

Lift-off point

40.550, -89.300

Record number

1508181709-01

5 damage points were recorded along this path by NWS ILX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 80 mph.

• Beginning of tornado. Crop damage and large tree limbs blown down onto house.
• Crop damage, about 50-75 yards wide in cornfield.
• Large tree limbs down on house and pine trees damaged.
• Large tree limbs down on house and damage to pine trees about 75 yards wide.

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

A vigorous upper-level disturbance tracking through the Upper Midwest interacted with an approaching cold front to trigger scattered strong to severe thunderstorms across central Illinois during the afternoon and evening of August 18th. Due to increasing low-level wind shear, a number of the storms began to rotate and produce funnel clouds. One storm produced a weak tornado in Tazewell County just east of Mackinaw. Other cells created scattered damaging wind gusts of around 60 mph and hail as large as quarters.

A tornado touched down 1.7 miles east-southeast of Mackinaw at 6:09 PM CDT. The tornado tracked northeastward for 2 miles, damaging several pine trees, downing tree limbs onto 3 houses, and damaging crops in a path 50 to 75 yards wide. The tornado dissipated in a wooded area 2.7 miles east-northeast of Mackinaw at 6:11 PM CDT.

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

2 minutes of warning. NWS ILX issued a tornado warning for this county at 23:07 UTC, 2 minutes before the tornado touched down, in force until 23:19 UTC.

The county was under a tornado watch, issued at 18:38 UTC and running to 00:07 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 Slight Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 20:37 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.

Bloomington/Norm (BMI), 34 km from the path, in the two hours either side.

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

The Lincoln radar (KILX), 43 km away, was scanning. The volume nearest the touchdown began at 23:06 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 2015 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

8 more were confirmed in the United States that day.

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.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.