From the National Weather Service, Norman Forecast Office:
The potential for severe storms will increase later today. While storms will still remain fairly isolated, conditions will become even more favorable for significant severe storms. A warm front by this afternoon is expected to lift back to near the Kansas border. A dryline will extend across west central Oklahoma and western north Texas. Sufficient heating should allow for a few isolated severe storms to develop. The main hazard will continue to be very large hail to baseball size. Damaging wind gusts to 70 mph are possible as well. As storms move eastward into central and northern portions of Oklahoma by evening, conditions will become increasingly favorable for a tornado or two. Storm severity may decrease after sunset, but scattered strong to severe storms may linger through the night.
IT IS VERY IMPORTANT TO CHECK FOR UPDATED INFORMATION from the NWS-Norman Forecast Office throughout the day.
To do so, go to: http://www.srh.noaa.gov/oun/