EF0 tornado, White Bear to Mungers, Missouri, June 24, 2021

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

June 24, 2021

Touchdown

12:01 AM CDT (05:01 UTC)

Lifted

12:03 AM CDT (05:03 UTC)

On the ground

2 minutes

Path length

0.2 miles (0.3 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

County

Marion County

Touchdown point

39.691, -91.500

Lift-off point

39.693, -91.497

Record number

2106242301-01

10 damage points were recorded along this path by NWS LSX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 81 mph.

• West side of home lost a large section of siding
• A white vinyl fence was completely destroyed and laid in a convergent pattern. Some minor damage to the roof of a two family residence.

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

A trough moved southeast through the region, generating a complex of showers and storms. Numerous reports of damaging winds, a few tornadoes and flash flooding were reported with this system.

A brief tornado touched down to the northeast of Renseselaer very early in the morning on June 25th. The tornado first touched down along County Road 429. The tornado quickly pushed northeast, doing damage to a few sheds at the intersection of County Road 429 and Highway MM. One shed was completely destroyed and its roof was lifted into a nearby tree. The tornado spread northeast across Highway MM, before lifting just to the north of Highway MM. The tornado was rated EF0 with a path length of 0.21 miles and a max path width of 50 yards. No injuries or deaths were reported.

A brief, narrow tornado touched down in a residential subdivision northwest of Hannibal, MO early Friday morning. The tornado first touched down along Rosewood Drive, where it ripped the siding off the westward facing wall of a residential home. The tornado then continued northeast towards Deer Ridge, completely destroying a couple of vinyl fences and breaking limbs off a large tree on the north side of Deer Ridge. The tornado quickly lifted as it pushed east towards Munger Lane. The tornado was rated EF0 with a path length of 0.13 miles and a max path width of 25 yards. No injuries or deaths were reported.

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

21 minutes of warning. NWS LSX issued a tornado warning for this county at 04:40 UTC, 21 minutes before the tornado touched down, in force until 05:18 UTC.

The county was under a severe thunderstorm watch, issued at 01:59 UTC and running to 05:46 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 01:06 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 St Louis radar (KLSX), 131 km away, was scanning. The volume nearest the touchdown began at 05:00 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 2021 tornado in MissouriEvery tornado in Missouri since 1950Warnings in force in Missouri 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.