EF0 tornado, Coon Rapids to Ham Lake, Minnesota, May 11, 2022

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

May 11, 2022

Touchdown

8:29 PM CDT (01:29 UTC)

Lifted

8:32 PM CDT (01:32 UTC)

On the ground

3 minutes

Path length

3.2 miles (5.1 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

County

Anoka County

Touchdown point

45.184, -93.272

Lift-off point

45.219, -93.230

Record number

2205111929-01

12 damage points were recorded along this path by NWS MPX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 79 mph.

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

A cluster of storms produced large hail stones west of Granite Falls, near Olivia, and northeast toward the northwest suburbs of the Twin Cities. Most of these storms were elevated but had a steep lapse rate to generate large hail, up to 2 inches in diameter at times. ||These late morning, and early afternoon storms moved northeast out of Minnesota. A warm front lifted northward across southern Minnesota during the afternoon with a potent shortwave moving northeast out of Nebraska. This shortwave generated a large complex of storms and quickly moved northeast across southern Minnesota and produced numerous damaging wind gusts, tornadoes and hail. There were even some flooding concerns as three to five inches of rain fell across portions of west central and central Minnesota by the late evening as the storms diminished and moved off to the northeast.||Three tornadoes occurred within the large bow echo that surged from southwest Minnesota, northeast toward east central Minnesota. One occurred in Brown County, another in Sibley and Carver County, and a third in Anoka County. All of the tornadoes were rated EF0 and produced mainly tree and roof damage.||According to Xcel Energy, more than 75,000 customers were without power across southern Minnesota during the peak of the storm.

The tornado touched down in the northeast corner of Coon Rapids, moved across the northwest corner of Blaine, and dissipated in the southwest corner of Ham Lake. It toppled or broke a few hundred trees, many of which fell on houses and sheds. One house near Jefferson Park had a portion of its eave ripped away, thereby allowing wind to enter the attic and damage the roof. Maximum winds were estimated at 80 mph.

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

6 minutes of warning. NWS MPX issued a tornado warning for this county at 01:23 UTC, 6 minutes before the tornado touched down, in force until 01:48 UTC.

The county was under a tornado watch, issued at 22:31 UTC and running to 02:12 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 0.10 chance of a tornado within 25 miles. The outlook in force was issued at 00:52 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.

Minneapls/Blaine (ANE), 7 km from the path, in the two hours either side.

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

The Minneapolis radar (KMPX), 46 km away, was scanning. The volume nearest the touchdown began at 01:27 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 2022 tornado in MinnesotaEvery tornado in Minnesota since 1950Warnings in force in Minnesota nowThe forecast where you are

6 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.