Tornado in Adair County, Oklahoma

This is the first segment of a two segment tornado. The tornado developed over inaccessible terrain west of Snake Mountain, just west of state line, where a tornadic debris signature was indicated by the KSRX WSR-88D. Since the damage that produced the radar debris signature was inaccessible, this segment of the tornado was rated EF-unknown.

Severe thunderstorms developed over central Oklahoma along and ahead of a dry line during the afternoon of the 19th, as an upper level disturbance approached the Southern Plains. These thunderstorms moved northeast off the dry line and across portions of eastern Oklahoma during the mid afternoon and evening hours. The atmosphere east of the dry line across eastern Oklahoma became very unstable during the afternoon and evening, and this instability combined with strong deep-layer and low-level wind shear, resulted in the development of a few supercell thunderstorms and a severe squall line. Multiple tornadoes, large hail slightly larger than golf ball size, and damaging wind gusts occurred with these thunderstorms across eastern Oklahoma. Locally heavy rainfall also produced some localized flash flooding.