Severe thunderstorms developed along a nearly stationary frontal boundary over central Oklahoma during the early afternoon hours of the 20th. Very unstable air combined with strong low-level and deep-layer shear resulted in long-lived supercells forming over central Oklahoma and moving eastward into eastern Oklahoma. The storms organized into bow echos and line segments over eastern Oklahoma, from which several other tornadoes developed during the early evening hours. One such tornado moved into northwestern Arkansas dissipating north of Cincinnati in Washington County. Two other tornadoes developed in Benton County. Damaging wind and large hail was also widespread across the region from these storms.

Hail in FRANKLIN, ARKANSAS
From 20-MAY-13 20:56:00 to 20-MAY-13 20:56:00 (CST-6)
Location: OZARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in WASHINGTON, ARKANSAS
From 20-MAY-13 17:45:00 to 20-MAY-13 17:47:00 (CST-6)
Location: CINCINNATI
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is the second and final segment of this tornado. In Washington County, this tornado damaged a home, damaged several barns, and snapped or uprooted numerous trees. Based on this damage, maximum estimated wind in this tornado segment was 100 to 110 mph.

Tornado in BENTON, ARKANSAS
From 20-MAY-13 17:49:00 to 20-MAY-13 17:54:00 (CST-6)
Location: SILOAM SPGS
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado developed just east of the state line, traveled east-northeast, and then turned more to the north before dissipating. It caused minor damage to a number of homes and blew down numerous large trees. Based on this damage, maximum estimated wind in the tornado was 85 to 95 mph.

Tornado in BENTON, ARKANSAS
From 20-MAY-13 18:24:00 to 20-MAY-13 18:25:00 (CST-6)
Location: LARUE
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado damaged one home, damaged several boat docks, and blew down trees. Based on this damage, maximum estimated wind in the tornado was 90 to 100 mph.

Thunderstorm Wind in SEBASTIAN, ARKANSAS
From 20-MAY-13 20:10:00 to 20-MAY-13 20:10:00 (CST-6)
Location: FT SMITH
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down several trees and power lines.

Thunderstorm Wind in CARROLL, ARKANSAS
From 20-MAY-13 18:37:00 to 20-MAY-13 18:37:00 (CST-6)
Location: EUREKA SPGS
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large trees and a few power poles were blown down by strong thunderstorm wind.

Thunderstorm Wind in CARROLL, ARKANSAS
From 20-MAY-13 18:40:00 to 20-MAY-13 18:40:00 (CST-6)
Location: EUREKA SPGS
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter estimated thunderstorm wind gusts to 80 mph.

Thunderstorm Wind in BENTON, ARKANSAS
From 20-MAY-13 18:25:00 to 20-MAY-13 18:25:00 (CST-6)
Location: GARFIELD
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down a tree onto a house.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 20-MAY-13 18:29:00 to 20-MAY-13 18:29:00 (CST-6)
Location: MAYFIELD
Magnitude: 75.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Several large trees were blown down by strong thunderstorm wind, one of which fell onto a house.

Thunderstorm Wind in CARROLL, ARKANSAS
From 20-MAY-13 18:40:00 to 20-MAY-13 18:40:00 (CST-6)
Location: BEAVER
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter reported several large trees uprooted or snapped by strong thunderstorm wind.

Thunderstorm Wind in CRAWFORD, ARKANSAS
From 20-MAY-13 19:00:00 to 20-MAY-13 19:00:00 (CST-6)
Location: NATURAL DAM
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Strong thunderstorm wind blew down a tree.

Thunderstorm Wind in MADISON, ARKANSAS
From 20-MAY-13 19:37:00 to 20-MAY-13 19:37:00 (CST-6)
Location: HUNTSVILLE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm wind blew down a large tree.

Thunderstorm Wind in CRAWFORD, ARKANSAS
From 20-MAY-13 20:15:00 to 20-MAY-13 20:15:00 (CST-6)
Location: VAN BUREN
Magnitude: 70.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew out the windows of a building on Washington Street. Multiple large trees were also blown down across the county.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 20-MAY-13 20:49:00 to 20-MAY-13 20:49:00 (CST-6)
Location: ALTUS
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A few trees and power lines were blown down by strong thunderstorm winds.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 20-MAY-13 20:49:00 to 20-MAY-13 20:49:00 (CST-6)
Location: WEBB CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind snapped large limbs, which fell onto the road blocking the intersection of Highways 23 and 96.

Thunderstorm Wind in CRAWFORD, ARKANSAS
From 20-MAY-13 20:17:00 to 20-MAY-13 20:17:00 (CST-6)
Location: VAN BUREN
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down a large tree.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 20-MAY-13 20:35:00 to 20-MAY-13 20:35:00 (CST-6)
Location: PETER PENDER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Small trees and branches were blown down by strong thunderstorm wind onto Highway 23.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 20-MAY-13 20:44:00 to 20-MAY-13 20:44:00 (CST-6)
Location: POPING
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Oak Bend Road at Highway 96 was blocked by large trees that had blown down by strong thunderstorm wind.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 20-MAY-13 20:48:00 to 20-MAY-13 20:48:00 (CST-6)
Location: POPING
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A few trees were blown down by strong thunderstorm winds.

Thunderstorm Wind in BENTON, ARKANSAS
From 20-MAY-13 18:16:00 to 20-MAY-13 18:16:00 (CST-6)
Location: LOWELL
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong thunderstorm wind blew down numerous large tree limbs, power poles, and power lines across town.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 20-MAY-13 18:17:00 to 20-MAY-13 18:17:00 (CST-6)
Location: SPRINGDALE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter estimated thunderstorm wind gusts of 70 mph.

Thunderstorm Wind in BENTON, ARKANSAS
From 20-MAY-13 18:21:00 to 20-MAY-13 18:21:00 (CST-6)
Location: PEA RIDGE
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down a tree onto a house.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 20-MAY-13 18:21:00 to 20-MAY-13 18:21:00 (CST-6)
Location: WEDINGTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind gusts were estimated to 70 mph.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 20-MAY-13 18:06:00 to 20-MAY-13 18:06:00 (CST-6)
Location: TONTITOWN
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind destroyed an outbuilding.

Thunderstorm Wind in BENTON, ARKANSAS
From 20-MAY-13 18:12:00 to 20-MAY-13 18:12:00 (CST-6)
Location: BENTONVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong thunderstorm wind estimated to 65 mph blew down large tree limbs.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 20-MAY-13 18:13:00 to 20-MAY-13 18:13:00 (CST-6)
Location: SPRINGDALE MUNI ARPT
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Strong thunderstorm wind damaged the sign of a business. The debris from the sign blew across Highway 412, struck a car in the driver side window, and killed the driver instantly.

Thunderstorm Wind in BENTON, ARKANSAS
From 20-MAY-13 18:15:00 to 20-MAY-13 18:15:00 (CST-6)
Location: BENTONVILLE MUNI ARP
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS instrument at Bentonville Municipal Airport measured 61 mph thunderstorm wind gusts.

Thunderstorm Wind in CARROLL, ARKANSAS
From 20-MAY-13 17:55:00 to 20-MAY-13 17:55:00 (CST-6)
Location: OAK GROVE
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Large trees limbs and power lines were blown down by strong thunderstorm wind in and around Blue Eye. Numerous power outages resulted from the damage.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 20-MAY-13 18:15:00 to 20-MAY-13 18:15:00 (CST-6)
Location: SPRINGDALE MUNI ARPT
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter measured thunderstorm wind gusts of 69 mph.