EF1 tornado in Cleveland County, Oklahoma

Two nearly-simultaneous tornadoes occurred in northwestern Pottawatomie County from a QLCS storm. The second tornado developed just inside Cleveland County before moving quickly into Pottawatomie County. Tree damage was observed at the county line as the tornado moved into Pottawatomie County, but the grove of trees in Cleveland County was not accessible to the survey team.

During the early morning of the 26th, ahead of a strong upper wave passage, a quasi-linear convective system (QLCS) developed across portions of central into eastern Oklahoma. Despite strong kinematics (wind shear) in place, the initial phase of the linear complex was rather benign (in terms of severe weather outcomes). However, as the complex overspread the Interstate 35 corridor, organization increased rapidly, including the development of several strong mesovortices. A cluster of weak tornadoes and wind damage occurred across portions of east-central Oklahoma, associated with these mesovortices. By the afternoon, while stronger synoptic support had lifted into portions of the Missouri Valley, strong convergence along a trailing boundary/pseudo-dryline promoted development of a few transient storms. A report of small hail was received with one of these storms across Seminole County.