Warm, moist, and very unstable air was in place across northwestern Arkansas ahead of the dry line, which moved into central Oklahoma during the afternoon. Several different waves of thunderstorms formed and moved across the region beginning in the afternoon of the 17th and ending in the evening. Very strong wind shear had also developed through a large depth of the atmosphere, which supported organized thunderstorms and even supercells. The most widespread damage occurred as a result of a squall line that developed on the dry line to the west and moved into northwestern Arkansas during the evening. Embedded bow echo thunderstorms and supercells resulted in numerous reports of large hail and wind damage.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 17-OCT-07 22:28:00 to 17-OCT-07 22:28:00 (CST-6)
Location: ALTUS
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated at 60 miles an hour blew down power lines causing power outages.

Thunderstorm Wind in MADISON, ARKANSAS
From 17-OCT-07 22:45:00 to 17-OCT-07 22:45:00 (CST-6)
Location: MARBLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm winds estimated at 60 miles an hour blew down several large tree limbs.

Hail in MADISON, ARKANSAS
From 17-OCT-07 22:05:00 to 17-OCT-07 22:05:00 (CST-6)
Location: HINDSVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in SEBASTIAN, ARKANSAS
From 17-OCT-07 21:39:00 to 17-OCT-07 21:39:00 (CST-6)
Location: FT SMITH
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds estimated at 70 miles an hour blew down trees and power lines across the City of Fort Smith.

Thunderstorm Wind in BENTON, ARKANSAS
From 17-OCT-07 20:45:00 to 17-OCT-07 20:45:00 (CST-6)
Location: BEAVER LAKE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated at 70 miles an hour blew down numerous trees in the Horseshoe Bend area.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 17-OCT-07 21:00:00 to 17-OCT-07 21:00:00 (CST-6)
Location: TONTITOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 17-OCT-07 21:01:00 to 17-OCT-07 21:01:00 (CST-6)
Location: SAVOY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BENTON, ARKANSAS
From 17-OCT-07 15:10:00 to 17-OCT-07 15:10:00 (CST-6)
Location: GENTRY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated at 60 miles an hour blew down large tree limbs.

Thunderstorm Wind in FRANKLIN, ARKANSAS
From 17-OCT-07 19:35:00 to 17-OCT-07 19:35:00 (CST-6)
Location: PETER PENDER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated at 60 miles an hour blew down large tree limbs.

Thunderstorm Wind in BENTON, ARKANSAS
From 17-OCT-07 20:00:00 to 17-OCT-07 20:00:00 (CST-6)
Location: DECATUR
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated at 70 miles an hour blew down numerous trees.

Thunderstorm Wind in BENTON, ARKANSAS
From 17-OCT-07 21:25:00 to 17-OCT-07 21:25:00 (CST-6)
Location: BEAVER LAKE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thundertorm winds estimated at 70 miles an hour blew down trees near Beaver Dam.

Thunderstorm Wind in CRAWFORD, ARKANSAS
From 17-OCT-07 21:41:00 to 17-OCT-07 21:41:00 (CST-6)
Location: VAN BUREN
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds estimated at 70 miles an hour blew down trees and power lines across the City of Van Buren.

Thunderstorm Wind in WASHINGTON, ARKANSAS
From 17-OCT-07 21:31:00 to 17-OCT-07 21:31:00 (CST-6)
Location: FAYETTEVILLE ARPT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: ASOS

The automated observing equipment at Drake Field measured a 58 mile an hour wind gust. Numerous trees and power lines were downed by the strong wind across the county.

Thunderstorm Wind in MADISON, ARKANSAS
From 17-OCT-07 22:05:00 to 17-OCT-07 22:05:00 (CST-6)
Location: HINDSVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated at 70 miles an hour split several large tree limbs and trees.

Thunderstorm Wind in BENTON, ARKANSAS
From 17-OCT-07 21:35:00 to 17-OCT-07 21:35:00 (CST-6)
Location: ROGERS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated at 70 miles an hour blew down numerous trees in the Prairie Creek Campground area.

Thunderstorm Wind in CRAWFORD, ARKANSAS
From 17-OCT-07 21:46:00 to 17-OCT-07 21:46:00 (CST-6)
Location: MOUNTAINBURG
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated at 70 miles an hour blew out a window of a home.

Thunderstorm Wind in MADISON, ARKANSAS
From 17-OCT-07 21:57:00 to 17-OCT-07 21:57:00 (CST-6)
Location: HINDSVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds estimated at 60 miles an hour blew down several large tree limbs.