EF1 tornado, Utica Arpt to Mt Clemens, Michigan, August 19, 2010

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

EF1

Date

August 19, 2010

Touchdown

7:29 PM EDT (23:29 UTC)

Lifted

7:35 PM EDT (23:35 UTC)

On the ground

6 minutes

Path length

2.5 miles (4.1 km)

Path width

250 yards (229 m)

Deaths

0

Injuries

0

Property damage

$500,000

County

Macomb County

Touchdown point

42.663, -82.978

Lift-off point

42.627, -82.966

Record number

1008191729-01

A supercell developed over far northern Saginaw late in the afternoon, then tracked southeast along a frontal boundary. This storm produced a swath of wind damage, large hail, and eventually spawning two tornadoes as it moved through Macomb County.

A tornado touched down near the intersection of 22 Mile and Hayes Road at 729 pm, tracking south-southeast before lifting at 735 pm just east of Hayes Road on M-59. Maximum winds were estimated to be up to 90 mph. Damage included multiple homes with roof damage, along with downed trees and power lines.

A tornado touched down on Dorchestour Court at 740 pm, just east of Romeo Plank and north of Canal Road. The tornado tracked southeast before lifting at 748 pm just west of the intersection of 14 Mile Road and Harper Avenue. Maximum winds were estimated up to 85 mph. A few homes sustained window, garage, and shingle damage. Wooden fences were blown over. Numerous trees were blown down.

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

25 minutes of warning. NWS DTX issued a tornado warning for this county at 23:04 UTC, 25 minutes before the tornado touched down, in force until 00:00 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 General Thunderstorms Risk. The outlook in force was issued at 16:30 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 Detroit radar (KDTX), 41 km away, was scanning. The volume nearest the touchdown began at 23:27 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 2010 tornado in MichiganEvery tornado in Michigan since 1950Warnings in force in Michigan nowThe forecast where you are

1 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.