Isolated severe storms will be possible overnight, as a Pacific cold front and dryline sweeps vigorously eastward across the state.
Severe storms should be confined to far southwestern and southern Oklahoma where instability levels will be highest. The strongest storms will be capable of producing golf-ball sized hail and wind gusts in excess of 60 mph. The tornado threat, while not zero due to increasing wind shear overnight, is very low.
Areas of rain and embedded thunderstorms will move across western Oklahoma through midnight, and affect central Oklahoma between midnight and 6 a.m. Sunday morning. Rain will end across the entire state by 9 a.m. with west winds of 20-35 mph and clearing skies Sunday afternoon.
After this round of weather, our attention then turns towards Tuesday. Cold air arriving from the north may combine with an upper-air low pressure system approaching from the south and west to produce snow across the state Tuesday morning through Tuesday evening.
At this time, just be aware that we could receive accumulating snow that may disrupt traveling during this timeframe. Exact amounts are forthcoming.