A tornado touched down just east of Glencoe in Payne County at 5:42 pm CST and moved northeastward for 8 miles before lifting just west of Pawnee in Pawnee County at 5:48 pm CST. Fifteen farm homes were destroyed while 11 other farm homes were damaged, and many other outbuildings were destroyed or damaged. Seven people were injured along the tornado's path.

A tornado moving north-northeastward across parts of Pawnee and Osage counties destroyed 1 home, badly damaged 3 other homes, destroyed or damaged many outbuildings, and killed some livestock in the Skedee area. Damage to outbuildings extended into the Fairfax district in Osage County. One person was injured in Pawnee County.

One farmstead was lightly damaged when a small tornado touched briefly 3 miles northwest of Pawnee. Flying debris slightly injured one person.

This tornado touched down just north of Oilton, OK in Creek County and moved northeastward across Terlton, OK in Pawnee County at 10:13 pm CST. It dissipated just west of Westport, OK in Pawnee County. A total of 120 structures were either damaged or destroyed. Three people were killed and 37 more persons injured. Damages were estimated at $2.5 million.

This tornado touched down 2.8 miles north and 6.3 miles east of Shamrock, OK in Creek County and moved northward along a 26-mile path through Pawnee and Osage counties. The tornado struck the Olive, OK area, then moved through Mannford, OK and New Prue, OK before dissipating just northeast of New Prue. The storm did considerable damage in Mannford and New Prue. One person was killed and 60 people were injured. Damage estimates for the storm were near $10 million.

The "Westport" tornado was the sixth in a series of 9 tornadoes that occurred in Oklahoma during the April 26, 1991 tornado outbreak. This tornado went along a 32-mile path from 1.5 miles west-southwest of Terlton, OK to 1 mile north-northwest of Skiatook. It began at 7:10 pm CST and ended at 8:27 pm CST. The tornado narrowly missed the town of Terlton as it moved east-northeast. Northeast of Terlton and west of OK State Highway 48, the tornado was weak (F0 damage to trees.) The tornado strengthened as it crossed OK State Highway 48, 0.5 miles south of the Cimarron Turnpike, and produced F1 and F2 intensity damage to structures and power poles. Up to that point it had been one-eighth mile in width.

After crossing OK State Highway 48, the tornado widened rapidly to about 1 mile and intensity increased to F4 strength as it crossed the turnpike. Several cars were swept off the turnpike with five injuries and one fatality. A man was killed when his car was overturned.

The tornado then crossed into the Keystone Airpark at 7:30 pm CST and caused significant damage to four hangers, and seven aircraft were destroyed. Two of the planes were tossed into trees. The fire station at the airport was demolished, with one of the fire engines pushed across the runway and flung into an area of trees about 0.25 miles away.

The Ridgemont Estates Subdivision 1 mile east of Westport, OK was hard hit, with F4 damage occurring to homes and trees. In the Westport area, 54 homes were completely demolished, 8 homes suffered substantial damage, and 32 homes suffered minor damage. Also destroyed were 70 vehicles, 5 mobile homes, 18 outbuildings, and 3 travel trailers. The community center at Westport suffered damage. There were no fatalities and no reported injuries at Westport. The tornado was 400-yards wide in the Westport area.

The tornado crossed Keystone Lake into Osage County at 7:44 pm CST, and briefly lifted in the vicinity of New Prue, OK. The tornado then touched down again east-northeast of New Prue, 0.5 miles southwest of the John Zink Scout Ranch and destroyed the lodge there, where a group of Girl Scouts had taken cover. There were no reported injuries among the scouts. All trees along the path of the tornado were snapped off or uprooted, as it continued to the northeast, to the extreme south edge of Skiatook Lake, where some boat docks and a marina were damaged. The tornado continued to 1.5 miles west of Skiatook on OK State Highway 20 where there was damage to a propane company at 8:15 pm CST.

The tornado moved on to a subdivision 1 mile west-northwest of Skiatook, OK, where 32 homes were destroyed, 11 homes suffered major damage, and 45 homes suffered minor damage. There were 19 injuries in the Skiatook area. The damage was rated at F3 intensity. The tornado continued northeast for a short time and lifted at 8:27 pm CST, shortly before crossing the Tulsa County line. Damage was estimated from this storm at close to $3 million.

The tornado developed over Keystone Lake, west of Appalachia Bay Recreation Area. The beginning of this tornado was filmed by storm chasers. The tornado moved east-southeast across the lake waters and adjacent uninhabited land areas. Damage is strongly suspected to trees in this segment of the tornado but those suspected areas were not accessible by road.

The tornado crossed into Osage County over Keystone Lake and quickly crossed U.S. Highway 412. It then moved through a wooded area that was inaccessible by road. The first damage that was accessible by the survey team was at S 209th W Avenue, where the tornado damaged a church, snapped large tree limbs, and damaged a home. It moved east- southeast toward W Archer Road snapping or uprooting trees and damaging homes.

The tornado moved into Tulsa County at W Archer Road to the east of S 209th W Avenue. The roofs of several homes were damaged and trees were uprooted as it crossed S 193rd W Avenue. The tornado moved southeast crossing U.S. Highway 412, where it snapped or uprooted numerous trees and blew a tractor trailer off the road . A doughnut shop was destroyed at S 177th W Avenue, homes were damaged, and trees and poles were snapped. It crossed the Arkansas River and moved through the River Oaks Estates Mobile Home Park where it destroyed 58 mobile homes and two permanent homes. One fatality and about 30 injuries occurred in this park. The tornado crossed the Arkansas River again as it moved east-southeast toward Sand Springs, uprooting numerous trees before dissipating on the south side of Sand Springs, OK, south of U.S. Highway 412 and just west of OK State Highway 97. Based on this damage, maximum estimated wind in the tornado was 125 to 135 mph.