EF1 tornado in Washington County, Oklahoma

This tornado uprooted trees, and blew the roof from an outbuilding. Based on this damage, maximum estimated wind in the tornado was 85 to 95 mph.

Strong to severe thunderstorms developed into and across eastern Oklahoma during the late morning through afternoon of the 4th, in an unseasonably moist and unstable air mass ahead of an approaching cold front. The atmosphere became very unstable ahead of the thunderstorms. The deep-layer and low-level wind shear strengthened during the afternoon, in response to a strong storm system translating into the Southern Plains from the Southern Rockies. The combination of very unstable air and very strong wind shear resulted in the development of some supercell thunderstorms, which produced multiple tornadoes across northeast and east central Oklahoma, including a long-track significant tornado that affected Cherokee and Adair Counties before moving into Arkansas. Damaging wind gusts also occurred. Locally heavy rainfall resulted in flash flooding.