This tornado touched down in Wynona in Osage County and moved northeastward through Pershing before striking the Bartlesville and Dewey areas in Washington County and then dissipating near South Coffeyville in Nowata County. Houses and business buildings were heavily damaged in Wynona and Pershing, and two children were injured by flying glass in Wynona.

In Washington County, both the Bartlesville and Dewey airports were heavily damaged while roofs, outbuildings, utility poles, trees, etc. were damaged extensively along the tornado's path. The last evidence of the damage path was near South Coffeyville where farmstead was damaged. Hail up to 1.5 inches fell along the path of the storm as it moved northeastward. No condensation funnel was spotted, but one witness described the storm as a low hanging square with three tails.

A tornado struck two automobiles on U.S. Highway 75 six miles north of Copan, and rolled one car two times. The tornado moved easterly across the highway, downing 3 telephone poles, mangling fences, and damaging or destroying trees. Three people were injured in the automobiles and the car that was rolled was totally destroyed.

A tornado touched down one mile east of Copan and then moved east-northeast to near Wann and South Coffeyville. Three people were injured by this tornado.

This tornado touched down 1 mile south-southwest of Copan in Washington County at 8:05 pm CST, and destroyed a convenience store and bait shop, along with damage to other buildings and trees. Two women were waiting in their car for the storm to pass, when the tornado picked the car up and tossed it into a field 250 yards to the northeast. The passenger was killed and the driver was critically injured. Nine other people were also injured in Copan. The tornado continued intermittently to the northeast, and lifted at 8:20 pm CST, just before crossing into Nowata County. The tornado was rated an F2, and damage was estimated at $100,000.

Thunderstorms developed in southwestern Oklahoma during the evening hours on April 10th and early morning hours of April 11th and moved to the east and northeast into much of central and portions of southeastern Oklahoma. These storms produced hail up to 2.25 inches in diameter, winds up to 75 mph, damaging lightning, and flash flooding rains.

A tornado touched down in Bartlesville near the intersection of U.S. Highway 75 and Adams Boulevard and moved near the intersection of Madison Boulevard and Tuxedo Boulevard. Roof damage occurred at the London House apartments, an antique mall, and several houses. Utility poles and trees were also blown down. One man reported he was lifted 4 to 5 feet in the air by the tornadic winds, sent spinning into cartwheels, and received a bloody nose. A total of 3 people were injured.

A tornado touched down 8 miles west southwest of Dewey or 6.5 miles northeast of Okesa and traveled 5 miles east-northeast before entering Washington County 5 miles northwest of Dewey or 7.2 miles southeast of Bowring. The tornado produced a 200-yard-wide damage swath along its path. The damage was to trees and power lines.

The tornado entered Washington County 5 miles northwest of Dewey and passed between Dewey and Copan before entering Nowata County 1 mile north of Wann or 6.8 miles east northeast of Copan. The tornado produced F2 damage and a half-mile-wide damage path at its peak. A total of 41 homes, 2 businesses and 40 barns and sheds were damaged. Sixteen of the homes were severely damaged including two mobile homes which were completely destroyed. Three people were treated at an emergency room of a hospital in Bartlesville due to injuries received during the tornado. Two of those people were inhabitants of one of the mobile homes that was destroyed.

The tornado entered Nowata County from Washington County one mile north of Wann. The tornado traveled east-northeast for 3 miles producing damage to barns, sheds, and power poles and power lines before lifting 7 miles west-southwest of South Coffeyville. The electrical service was interrupted for up to 8 hours in the northwest part of Nowata County and adjacent parts of Washington County.

Severe thunderstorms developed over western Oklahoma during the afternoon of May 6th, as a dry line sharpened over the area. These storms developed eastward across central Oklahoma during the afternoon, and then moved into eastern Oklahoma during the evening. Very strong instability developed ahead of the storms, and wind shear became very strong during the mid to late evening, as wind fields strengthened over the region with the approach of a strong upper level disturbance. As a result of this very strong instability and wind shear, supercell thunderstorms evolved as the storms moved east of the dry line. Strengthening low level wind shear promoted the development of tornadoes, one of which became violent as it moved through Osage County. Large hail up to golf ball size and damaging wind gusts also occurred.

A squall line organized as the storms moved into eastern Oklahoma, with several supercells maintaining their structure within the squall line. Damaging wind gusts, large hail to quarter size, and several tornadoes occurred with the squall line as it moved through the area into the early morning of May 7th. One tornado became strong as it moved across portions of Adair County. Locally heavy rainfall resulted in some flash flooding.

This tornado developed just north of County Road 1701 southeast of Hominy, where trees were uprooted and snapped. The tornado moved northeast and crossed OK State Highway 20, snapping numerous trees and snapping seven metal power poles. The tornado continued to snap and uproot numerous trees between OK State Highway 20 and Barnsdall. Significant tree damage was found in several locations. A well-built home was destroyed just southwest of town. Multiple vehicles were thrown and rolled, and trees were stubbed and debarked in this area.

The tornado then moved into Barnsdall, causing severe damage to the wax plant on the southeast side of town. More than 110 homes and businesses were damaged, 65 of those were destroyed. Numerous trees were stubbed in the area of some of the higher end damage. Two fatalities and at least 33 injuries occurred in Barnsdall. Significant tree damage continued northeast of Barnsdall, a few homes were damaged, and outbuildings were destroyed between Barnsdall and the Osage-Washington County line.

The tornado crossed into Washington County near Gap Road , and moved across the southwestern portion of Bartlesville, and then across the central and northeastern side of town. An estimated 1000 homes and businesses were damaged in town, some severely. Numerous trees were snapped or uprooted, and many power poles were snapped. A squall line merged with the tornadic supercell, and ultimately ended the tornado process northeast of Bartlesville.