Tornadoes · United States · Kansas · 2026

Unrated tornado, Atchison County, Kansas, April 17, 2026

This Unrated tornado ran 0.0 miles across Atchison County on April 17, 2026, touching down at 3:08 PM CDT. It killed nobody.

Preliminary. This is NWS EAX's damage survey, filed in the Damage Assessment Toolkit as Atchison. The rating, the path and the casualties are the survey's and can change while it is revised. The Storm Prediction Center compiles the official record of 2026 from these surveys and publishes it in the spring of 2027; this page moves to that tornado's permanent address when it does.

The rating scale

Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.

  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 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. Unratedthis tornado

    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.

The survey

Rating, as surveyed
Unrated, preliminary
Date
April 17, 2026
Touchdown
3:08 PM CDT (20:08 UTC)
Path length
0.0 miles (0.0 km)
Path width
0 yards (0 m)
Deaths
0
Injuries
0
County
Atchison County
Touchdown point
39.463, -95.104
Lift-off point
39.463, -95.104
Surveyed by
NWS EAX
The office's name for it
Atchison
Survey last edited
April 18, 2026
Record number
None yet. SPC numbers 2026 in the spring of 2027.

What the survey found

Storm chaser observed brief tornado near the intersection of 230th Road and Sheridan Road in Atchison County, KS. Time was approximately 3:08 pm CDT on April 17 as estimated by radar data. Rating as EF-U since no visible damage was observed in this area, according to emergency management.

Written by NWS EAX in the NWS Damage Assessment Toolkit. A survey is revised as better evidence arrives.

The damage survey

1 damage points were recorded along this path by NWS EAX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EFU.

  • Storm chaser observed brief tornado near the intersection of 230th Road and Sheridan Road in Atchison County, KS. Time was approximately 3:08 pm CDT on April 17 as estimated by radar data. Rating as EF-U since no visible damage was observed in this area, according to emergency management.

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

The warnings

11 minutes of warning. NWS EAX issued a tornado warning for this county at 19:57 UTC, 11 minutes before the tornado touched down, in force until 20:30 UTC.

The county was under a tornado watch, issued at 18:42 UTC and running to 22:55 UTC.

Issued (UTC)ExpiredProductOffice
18:42 UTC22:55 UTCTornado WatchEAX
19:27 UTC20:15 UTCSevere Thunderstorm WarningEAX
19:38 UTC20:15 UTCSevere Thunderstorm WarningEAX
19:57 UTC20:30 UTCTornado WarningEAX
20:07 UTC20:45 UTCSevere Thunderstorm WarningEAX
20:39 UTC21:21 UTCSevere Thunderstorm WarningEAX

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 forecast that day

The Storm Prediction Center had this point in a Enhanced Risk, with a 0.05 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 19:53 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 air that afternoon

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.

Topeka, KS (KTOP), 12:00Z

8.1 hours before the tornado, 69 km from the path. April 17, 2026.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 2026-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2338 joules per kilogram, CIN -172, lifted condensation level 934 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Topeka, KS at 12:00Z on 2026-04-17The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 379 square meters per square second, 0 to 6 km bulk shear 44 knots.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
2338 J/kg
Mixed-layer CIN
-172 J/kg
Surface CAPE
2427 J/kg
Mixed-layer LCL
934 m above ground
0-6 km bulk shear
44 kt
0-1 km bulk shear
42 kt
0-1 km storm-relative helicity
379 m²/s²
0-3 km storm-relative helicity
354 m²/s²
Significant tornado parameter
0.8
Supercell composite
16.5
0-3 km lapse rate
5.7 K/km

Open this sounding in Storm Lab

Topeka, KS (KTOP), 00:00Z

3.9 hours after it, 69 km from the path. April 18, 2026.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2026-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 0 joules per kilogram, CIN -100593, lifted condensation level 1515 meters above ground. Wind barbs in knots down the right edge.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Topeka, KS at 00:00Z on 2026-04-18The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity -101 square meters per square second, 0 to 6 km bulk shear 87 knots.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
-100593 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
1515 m above ground
0-6 km bulk shear
87 kt
0-1 km bulk shear
9 kt
0-1 km storm-relative helicity
-101 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0
0-3 km lapse rate
5.5 K/km

Open this sounding in Storm Lab

The radar

The Pleasant Hill radar (KEAX), 103 km away, was scanning. The volume nearest the touchdown began at 20:08 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.

What was reported nearby

Local storm reports within 60 km of the path, in the three hours either side.

Time (UTC)ReportWhereCountyRemark
19:29 UTCHAIL 11 E Valley FallsJefferson, KS
20:05 UTCTORNADO3 Ne PotterAtchison, KSSpotter saw a brief touchdown.
20:08 UTCHAIL 1AtchisonAtchison, KSSocial media report. Time estimated from radar.
20:08 UTCTORNADO3 Ne PotterAtchison, KSStorm chaser observed brief tornado near the intersection of 230th Road and Sheridan Road in Atchison County, KS. Time was approximately 3:08 pm CDT on April 17 as estimated by radar data. Rating as EF-U since no visible
20:47 UTCHAIL 1PotterAtchison, KS
21:46 UTCTSTM WND DMG1 Nw Kansas City KansasWyandotte, KSDowned wires and power outages near Everett Avenue. Time estimated from radar.
21:48 UTCTSTM WND DMG1 Wnw Kansas City KansaWyandotte, KSDowned wires near Nebraska Avenue. Time estimated from radar.
21:52 UTCTSTM WND DMG3 Nnw Roeland ParkWyandotte, KSDowned power lines near 31st Street. Time estimated from radar.
22:08 UTCTSTM WND DMG2 Nnw MissionWyandotte, KSDowned wires and power outages near 36th Street. Time estimated from radar.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

This ground now

The live radar over the trackEvery 2026 tornado in KansasEvery tornado in Kansas since 1950Warnings in force in Kansas nowThe forecast where you are

The other tornadoes of April 17, 2026

88 more have been surveyed in the United States that day, so far.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
April 171:46 PM CDTEF0Mower, MN2.8110
April 171:55 PM CDTEF0Dodge, MN5.3150
April 172:19 PM CDTEF2Olmsted, MN9.72502
April 172:32 PM CDTUnratedButler, IA1.610
April 172:33 PM CDTEF1Olmsted, MN12.4200
April 172:47 PM CDTEF1Jo Daviess, IL3.7100
April 172:47 PM CDTEF2Olmsted, MN7.7200
April 172:47 PM CDTEF0Howard, IA4.2601
April 173:26 PM CDTEF3Buffalo, WI10.3300
April 173:36 PM CDTEF2Stephenson, IL12.51,250
April 174:07 PM CDTEF1Osage, KS1.175
April 174:09 PM CDTEF1Trempealeau, WI5.690
April 174:17 PM CDTUnratedClayton, IA0.620
April 174:20 PM CDTEF1Trempealeau, WI4.6130
April 174:35 PM CDTUnratedWinnebago, IL0.750
April 174:44 PM CDTEF1Marathon, WI4.3100
April 174:46 PM CDTEF3Marathon, WI13.5600$8,000
April 174:52 PM CDTEF1Jackson, WI2.3150
April 174:57 PM CDTEF1Winnebago, IL5.0400
April 175:02 PM CDTEF1Washington, IA5.3100
April 175:19 PM CDTEF1Cass, MO4.80
April 176:02 PM CDTEF1Rock, WI1.975
April 176:05 PM CDTEF1Rock, WI2.1100
April 176:15 PM CDTEF1Rock, WI4.475
April 176:39 PM CDTEF1Walworth, WI3.075
April 176:40 PM CDTEF0Mercer, IL0.950
April 176:43 PM CDTEF1Walworth, WI3.175
April 176:55 PM CDTEF1Hancock, IL5.7150
April 176:55 PM CDTEF0Kay, OK5.1100
April 177:03 PM CDTEF1Winnebago, IL11.6350
April 177:03 PM CDTEF1Kay, OK14.41,200
April 177:04 PM CDTEF1Henry, IL0.350
April 177:11 PM CDTEF1Kay, OK0.975
April 177:12 PM CDTEF1Kay, OK0.375
April 177:13 PM CDTEF1Hancock, IL6.075
April 177:15 PM CDTEF1Knox, IL10.3800
April 177:19 PM CDTEF1Benton, MO5.90
April 177:22 PM CDTEF0Walworth, WI1.950
April 177:23 PM CDTEF0Benton, MO0.4200
April 177:25 PM CDTEF1Benton, MO1.6150
April 177:29 PM CDTEF2McDonough, IL12.8200$90
April 177:32 PM CDTEF0Racine, WI1.450
April 177:40 PM CDTEF2Fulton, IL18.1500$500
April 177:44 PM CDTEF0Morgan, MO1.20
April 177:46 PM CDTEF1Morgan, MO7.2300
April 177:50 PM CDTEF1Schuyler, IL36.71,200
April 177:52 PM CDTEF0Waukesha, WI0.670
April 177:55 PM CDTEF0Racine, WI3.750
April 177:56 PM CDTEF1Racine, WI5.275
April 177:59 PM CDTEF0Morgan, MO1.3150
April 178:08 PM CDTEF0Cole, MO3.550
April 178:11 PM CDTEF1Mason, IL15.4200
April 178:14 PM CDTEF1Bureau, IL17.6300
April 178:22 PM CDTEF1Tazewell, IL6.3100
April 178:26 PM CDTEF1Menard, IL5.9300
April 178:27 PM CDTEF1Tazewell, IL2.3500
April 178:27 PM CDTEF1Tazewell, IL2.370$50
April 178:29 PM CDTEF1Tazewell, IL4.61,100
April 178:31 PM CDTEF0Callaway, MO2.350
April 178:34 PM CDTEF2Tazewell, IL4.01,000

All 89 of them

What this means

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. A survey can be revised, so the rating, the path and the casualties can all still change.

Sources

NWS Damage Assessment Toolkit, the record the survey teams file from the damage, and NOAA Storm Prediction Center storm reports. Neither is the official database for 2026, which SPC publishes in the spring of 2027.