EF0 tornado, Allen, Kansas, March 28, 2012

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

March 28, 2012

Touchdown

8:32 PM CDT (01:32 UTC)

Lifted

8:34 PM CDT (01:34 UTC)

On the ground

2 minutes

Path length

0.1 miles (0.1 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

County

Lyon County

Touchdown point

38.550, -96.210

Lift-off point

38.551, -96.209

Record number

1203281932-01

On the evening of March 28, 2012, northeast Kansas was impacted by large hail, one tornado and heavy rain. One storm impacted Osage County with hail reports larger than baseballs across Osage County. A funnel cloud was also reported with this storm near Carbondale. Another storm impacted eastern Morris and Lyon Counties bringing hen egg sized hail to Council Grove and golfball sized hail to Dunlap. The storm continued to move slowly and intensify across Lyon County, and produced a brief tornado touchdown in rural Lyon County. Additional large hail reports of 2 inches were reported near Bushong. Heavy rain also fell from this storm due to its slow movement eastward and several Lyon County roads had to be barricaded due to running water over the road. Other storms moved across the area with hail up to the size of golfballs in Nemaha and Pottawatomie counties during the late evening hours.

Storm chasers confirmed a brief tornado in open country.

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

12 minutes of warning. NWS TOP issued a tornado warning for this county at 01:20 UTC, 12 minutes before the tornado touched down, in force until 01:45 UTC.

The county was under a severe thunderstorm watch, issued at 22:51 UTC and running to 04:33 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 01:00 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 Topeka radar (KTWX), 50 km away, was scanning. The volume nearest the touchdown began at 01:30 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 2012 tornado in KansasEvery tornado in Kansas since 1950Warnings in force in Kansas nowThe forecast where you are

2 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.