EF1 tornado in Delaware County, Oklahoma

This is the first segment of a two-segment tornado. In Delaware County, this large tornado developed south of the E 260 Road and west of the S 4520 Road. It moved northeast snapping and uprooting numerous trees, damaging a home, damaging barns and outbuildings, and snapping power poles. The tornado was observed by multiple people. Based on this damage, maximum estimated wind in this segment of the tornado was 90 to 100 mph. The tornado continued into Ottawa County.

Strong to severe thunderstorms developed across eastern Oklahoma during the early afternoon hours of the 30th, to the east of a stationary frontal boundary that was located across north-central Oklahoma into northwest Texas. Moderately strong instability combined with strong wind shear resulted in the development of supercell thunderstorms, which produced multiple tornadoes, including two strong tornadoes, large hail up to half dollar size, and damaging winds. Locally heavy rainfall also occurred across portions of northeastern Oklahoma, which resulted in flash flooding.