EF1 tornado in Tulsa County, Oklahoma

This tornado developed just south of E Pine Street at N Rockford Avenue and moved east. The tornado damaged a number of homes and structures, blew down trees, and snapped two power poles. A man was injured when a large tree fell onto his house. The tornado dissipated just north of E Pine Street near N Oswego Avenue. Based on this damage, maximum estimated wind in the tornado was 90 to 100 mph.

A strong upper level storm system moved into the Southern Plains from the Rockies on the 20th and 21st. The attendant warm front moved from northern Texas northward into northeastern Oklahoma during the day on the 20th, and then the cold front associated with this storm system moved through eastern Oklahoma during the late evening of the 20th and early morning hours of the 21st. Warm, moist, and very unstable air resided across eastern Oklahoma ahead of this system. This pattern resulted in multiple rounds of severe thunderstorms across eastern Oklahoma from the early afternoon of the 20th through late morning of the 21st. Very strong wind shear coexisting with the strong instability resulted in some supercell thunderstorms that produced large hail up to golfball size and multiple tornadoes on the 20th. A squall line developed along the cold front that moved into the area during the morning of the 21st, and that line of storms produced multiple tornadoes along the leading edge. Locally heavy rainfall and subsequent flash flooding occurred across northeastern Oklahoma as multiple rounds of thunderstorms affected generally the same area.