Severe thunderstorms developed along and ahead of a quasi-stationary front that was draped across the area. One long-lived supercell produced a brief tornado northwest of Ark City before exiting into Oklahoma and becoming stationary. The supercell then moved north and produced multiple tornadoes as a large bow echo thunderstorm merged with the supercell in central Cowley County. This was quickly followed by several shorter-lived Quasi-Linear Convective System (QLCS) tornadoes north and east of Winfield.

Tornado in COWLEY, KANSAS
From 14-MAY-18 17:40:00 to 14-MAY-18 17:41:00 (CST-6)
Location: ARKANSAS CITY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Very brief touchdown in open country.

Hail in SUMNER, KANSAS
From 14-MAY-18 14:58:00 to 14-MAY-18 14:59:00 (CST-6)
Location: GEUDA SPGS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WOODSON, KANSAS
From 14-MAY-18 15:13:00 to 14-MAY-18 15:14:00 (CST-6)
Location: YATES CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ALLEN, KANSAS
From 14-MAY-18 15:39:00 to 14-MAY-18 15:40:00 (CST-6)
Location: HUMBOLDT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in ALLEN, KANSAS
From 14-MAY-18 15:33:00 to 14-MAY-18 15:34:00 (CST-6)
Location: HUMBOLDT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BUTLER, KANSAS
From 14-MAY-18 15:49:00 to 14-MAY-18 15:50:00 (CST-6)
Location: TOWANDA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in GREENWOOD, KANSAS
From 14-MAY-18 15:55:00 to 14-MAY-18 15:56:00 (CST-6)
Location: HAMILTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BUTLER, KANSAS
From 14-MAY-18 16:06:00 to 14-MAY-18 16:07:00 (CST-6)
Location: EL DORADO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in GREENWOOD, KANSAS
From 14-MAY-18 14:12:00 to 14-MAY-18 14:13:00 (CST-6)
Location: HAMILTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in ALLEN, KANSAS
From 14-MAY-18 14:25:00 to 14-MAY-18 14:26:00 (CST-6)
Location: IOLA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ALLEN, KANSAS
From 14-MAY-18 14:36:00 to 14-MAY-18 14:37:00 (CST-6)
Location: IOLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SUMNER, KANSAS
From 14-MAY-18 14:32:00 to 14-MAY-18 14:33:00 (CST-6)
Location: SOUTH HAVEN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in WOODSON, KANSAS
From 14-MAY-18 14:42:00 to 14-MAY-18 14:43:00 (CST-6)
Location: YATES CENTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SEDGWICK, KANSAS
From 14-MAY-18 22:10:00 to 14-MAY-18 22:11:00 (CST-6)
Location: CLEARWATER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in HARPER, KANSAS
From 14-MAY-18 23:48:00 to 14-MAY-18 23:49:00 (CST-6)
Location: HARPER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HARPER, KANSAS
From 14-MAY-18 23:33:00 to 14-MAY-18 23:34:00 (CST-6)
Location: ATTICA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in COWLEY, KANSAS
From 14-MAY-18 17:50:00 to 14-MAY-18 17:51:00 (CST-6)
Location: ARKANSAS CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power poles were downed on 41st road.

Hail in ALLEN, KANSAS
From 14-MAY-18 16:10:00 to 14-MAY-18 16:11:00 (CST-6)
Location: HUMBOLDT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COWLEY, KANSAS
From 14-MAY-18 16:11:00 to 14-MAY-18 16:12:00 (CST-6)
Location: ARKANSAS CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SUMNER, KANSAS
From 14-MAY-18 16:38:00 to 14-MAY-18 16:39:00 (CST-6)
Location: OXFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SUMNER, KANSAS
From 14-MAY-18 16:42:00 to 14-MAY-18 16:43:00 (CST-6)
Location: OXFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in COWLEY, KANSAS
From 14-MAY-18 16:40:00 to 14-MAY-18 16:41:00 (CST-6)
Location: WINFIELD ARPT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in COWLEY, KANSAS
From 14-MAY-18 17:01:00 to 14-MAY-18 17:02:00 (CST-6)
Location: WINFIELD ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in WOODSON, KANSAS
From 14-MAY-18 17:14:00 to 14-MAY-18 17:15:00 (CST-6)
Location: BATESVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in COWLEY, KANSAS
From 14-MAY-18 17:47:00 to 14-MAY-18 17:48:00 (CST-6)
Location: ARKANSAS CITY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

This report was relayed via Skywarn.

Hail in COWLEY, KANSAS
From 14-MAY-18 17:52:00 to 14-MAY-18 17:53:00 (CST-6)
Location: ARKANSAS CITY
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COWLEY, KANSAS
From 14-MAY-18 18:28:00 to 14-MAY-18 18:29:00 (CST-6)
Location: SILVERDALE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This report came in via Mping.

Hail in COWLEY, KANSAS
From 14-MAY-18 18:32:00 to 14-MAY-18 18:33:00 (CST-6)
Location: SILVERDALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COWLEY, KANSAS
From 14-MAY-18 18:33:00 to 14-MAY-18 18:34:00 (CST-6)
Location: ROCK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COWLEY, KANSAS
From 14-MAY-18 18:42:00 to 14-MAY-18 18:43:00 (CST-6)
Location: MAPLE CITY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This report came in via Mping.

Hail in COWLEY, KANSAS
From 14-MAY-18 18:45:00 to 14-MAY-18 18:46:00 (CST-6)
Location: MAPLE CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in COWLEY, KANSAS
From 14-MAY-18 18:44:00 to 14-MAY-18 18:45:00 (CST-6)
Location: UDALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in NEOSHO, KANSAS
From 14-MAY-18 19:03:00 to 14-MAY-18 19:04:00 (CST-6)
Location: GALESBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Fifty mph winds were also reported with this storm.

Hail in SEDGWICK, KANSAS
From 14-MAY-18 19:26:00 to 14-MAY-18 19:27:00 (CST-6)
Location: DERBY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BUTLER, KANSAS
From 14-MAY-18 21:30:00 to 14-MAY-18 21:31:00 (CST-6)
Location: BENTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CHAUTAUQUA, KANSAS
From 14-MAY-18 21:25:00 to 14-MAY-18 21:26:00 (CST-6)
Location: CEDAR VALE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree damage was reported across town along with the awning at the city pool being blown off.

Thunderstorm Wind in SALINE, KANSAS
From 13-MAY-18 22:54:00 to 13-MAY-18 22:55:00 (CST-6)
Location: (SLN)SALINA MUNI ARP
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured by NWS observing equipment.

Hail in GREENWOOD, KANSAS
From 14-MAY-18 12:49:00 to 14-MAY-18 12:50:00 (CST-6)
Location: MADISON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Via local media social media account.  It was a delayed report.

Hail in GREENWOOD, KANSAS
From 14-MAY-18 13:44:00 to 14-MAY-18 13:45:00 (CST-6)
Location: THRALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WOODSON, KANSAS
From 14-MAY-18 14:02:00 to 14-MAY-18 14:03:00 (CST-6)
Location: NEOSHO FALLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in BUTLER, KANSAS
From 14-MAY-18 18:05:00 to 14-MAY-18 18:06:00 (CST-6)
Location: CASSODAY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A viewer called in and reported damage to their shed.

Hail in SUMNER, KANSAS
From 14-MAY-18 16:07:00 to 14-MAY-18 16:08:00 (CST-6)
Location: GEUDA SPGS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in BUTLER, KANSAS
From 14-MAY-18 16:10:00 to 14-MAY-18 16:11:00 (CST-6)
Location: EL DORADO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in NEOSHO, KANSAS
From 14-MAY-18 18:33:00 to 14-MAY-18 18:34:00 (CST-6)
Location: THAYER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in COWLEY, KANSAS
From 14-MAY-18 20:45:00 to 14-MAY-18 20:46:00 (CST-6)
Location: ARKANSAS CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

No damage was reported.

Flash Flood in ALLEN, KANSAS
From 14-MAY-18 15:14:00 to 14-MAY-18 18:30:00 (CST-6)
Location: IOLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

High water was reported in town, especially at State and Jefferson Streets with portions of the those streets being barricaded.

Heavy Rain in ALLEN, KANSAS
From 14-MAY-18 16:11:00 to 14-MAY-18 16:12:00 (CST-6)
Location: IOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The total rainfall for this location was 4.4 inches.

Hail in COWLEY, KANSAS
From 14-MAY-18 17:26:00 to 14-MAY-18 17:27:00 (CST-6)
Location: WINFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This report came in via social media.

Hail in WOODSON, KANSAS
From 14-MAY-18 17:27:00 to 14-MAY-18 17:28:00 (CST-6)
Location: BATESVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in COWLEY, KANSAS
From 14-MAY-18 17:49:00 to 14-MAY-18 17:50:00 (CST-6)
Location: WINFIELD ARPT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This report came in via Mping.

Hail in COWLEY, KANSAS
From 14-MAY-18 18:40:00 to 14-MAY-18 18:41:00 (CST-6)
Location: ROCK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COWLEY, KANSAS
From 14-MAY-18 18:42:00 to 14-MAY-18 18:43:00 (CST-6)
Location: SILVERDALE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BUTLER, KANSAS
From 14-MAY-18 19:52:00 to 14-MAY-18 19:53:00 (CST-6)
Location: ROSE HILL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BUTLER, KANSAS
From 14-MAY-18 19:43:00 to 14-MAY-18 19:44:00 (CST-6)
Location: POTWIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in NEOSHO, KANSAS
From 14-MAY-18 21:08:00 to 14-MAY-18 21:09:00 (CST-6)
Location: CHANUTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in NEOSHO, KANSAS
From 14-MAY-18 21:10:00 to 14-MAY-18 21:20:00 (CST-6)
Location: CHANUTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The hail lasted a full 10 minutes.

Thunderstorm Wind in NEOSHO, KANSAS
From 14-MAY-18 21:10:00 to 14-MAY-18 21:11:00 (CST-6)
Location: THAYER
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by official measuring equipment.

Flash Flood in ALLEN, KANSAS
From 14-MAY-18 15:32:00 to 14-MAY-18 18:30:00 (CST-6)
Location: IOLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several roads across the county were being impacted to the west of Iola.

Hail in SEDGWICK, KANSAS
From 15-MAY-18 00:05:00 to 15-MAY-18 00:06:00 (CST-6)
Location: CLEARWATER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SEDGWICK, KANSAS
From 14-MAY-18 20:29:00 to 14-MAY-18 20:30:00 (CST-6)
Location: EASTBOROUGH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Fifty to fifty five mph wind gusts were also reported with the hail.

Tornado in COWLEY, KANSAS
From 14-MAY-18 21:06:00 to 14-MAY-18 21:11:00 (CST-6)
Location: BURDEN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tree damage was noted along the path.

Tornado in COWLEY, KANSAS
From 14-MAY-18 20:56:00 to 14-MAY-18 21:04:00 (CST-6)
Location: WINFIELD
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tree damage was the main issue along this path.  No structures were hit.

Tornado in COWLEY, KANSAS
From 14-MAY-18 20:45:00 to 14-MAY-18 20:56:00 (CST-6)
Location: MAPLE CITY
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Damage to trees with some being uprooted and large electrical transmission lines were downed.

Tornado in COWLEY, KANSAS
From 14-MAY-18 20:48:00 to 14-MAY-18 21:11:00 (CST-6)
Location: MAPLE CITY
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several large trees sustained damage along the path.  It also caused damage to a barn.

Tornado in COWLEY, KANSAS
From 14-MAY-18 17:35:00 to 14-MAY-18 17:37:00 (CST-6)
Location: WINFIELD ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Tornado briefly touched down, knocking down 3 power poles.

Tornado in CHAUTAUQUA, KANSAS
From 14-MAY-18 21:22:00 to 14-MAY-18 21:24:00 (CST-6)
Location: CEDAR VALE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Brief touchdown in open country outside of town.

Tornado in COWLEY, KANSAS
From 14-MAY-18 20:53:00 to 14-MAY-18 20:55:00 (CST-6)
Location: WINFIELD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Brief touchdown over open country. Only some tree damage was noted.

Tornado in COWLEY, KANSAS
From 14-MAY-18 20:26:00 to 14-MAY-18 20:35:00 (CST-6)
Location: MAPLE CITY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large electrical transmission lines were downed and a tree was completely uprooted.