EF0 tornado, North Salem, Missouri, August 11, 2023

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 11, 2023

Touchdown

11:18 PM CDT (04:18 UTC)

Lifted

11:21 PM CDT (04:21 UTC)

On the ground

3 minutes

Path length

1.3 miles (2.0 km)

Path width

30 yards (27 m)

Deaths

0

Injuries

0

County

Linn County

Touchdown point

40.030, -93.000

Lift-off point

40.040, -92.980

Record number

2308112218-01

3 damage points were recorded along this path by NWS EAX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 83 mph.

• Minor damage to a barndominium type building - roof and siding damage and garage doors blown in.

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

On the evening hours of August 11th into early morning August 12th, storms brought hail, damaging winds, flash flooding, and even a brief tornado to northern Missouri.

A brief EF-0 tornado began just south of Highway O in far northern Linn County just south of the Linn and Sullivan County line. The tornado initially damaged some trees and small outbuildings before moving to the east and damaging the roof, siding, and garage doors of a newly built barndominium type building on the north side of Highway O just west of the Highway O and Highway V intersection. The tornado traveled just over a mile and was on the ground for about 3 minutes. Thanks to the Linn County EM for their assistance on the survey.

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

3 minutes of warning. NWS EAX issued a tornado warning for this county at 04:15 UTC, 3 minutes before the tornado touched down, in force until 04:30 UTC.

The county was under a severe thunderstorm watch, issued at 02:25 UTC and running to 09:00 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 Slight Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 00:49 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 Pleasant Hill radar (KEAX), 175 km away, was scanning. The volume nearest the touchdown began at 04:20 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 2023 tornado in MissouriEvery tornado in Missouri since 1950Warnings in force in Missouri 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.