Oklahoma City, OK hail storm history

What the National Weather Service wrote

While the upper air pattern across Oklahoma and north Texas was benign (from a thunderstorm perspective) for much of the 5th, a cluster of occasionally intense thunderstorms tracked along a quasi-stationary boundary from the eastern Texas Panhandle through portions of western and south-central Oklahoma during the afternoon and evening hours. This activity initiated along a mid-level front within a zone of strong isentropic ascent. Thunderstorm wind damage, including a swath of significant damage across portions of southern McClain and northern Garvin Counties, and large hail were noted episodically with this activity.