Norman, OK hail storm history

What the National Weather Service wrote

As multiple low-amplitude upper waves (embedded within broad zonal flow) traversed the Southern Plains, two rounds of convection occurred across the forecast area on the 19th. The first round, from the late morning into early afternoon, included a few reports of marginally severe hail across north-central into eastern Oklahoma, owing to relatively weak instability present during this time frame.

Read the full description

By the early evening, aided by sufficient deep-layer wind shear and increasing (significant in magnitude) convective instability, multiple supercell thunderstorms initiated across southwest Oklahoma. Reports of large to very large hail and wind damage were received across the aforementioned areas. A 'left-split' (supercell) thunderstorm traveled into portions of central Oklahoma, including the southern suburbs of the Oklahoma City Metropolitan area, and produced continued reports of significant hail during the late evening time frame. Additional supercell thunderstorms developed further north across central Oklahoma during the evening as well. While a few reports of large hail were also received with these storms, greater convective inhibition limited the longevity of impact from these thunderstorms.