As you can see by the latest radar image above, we have thunderstorm initiation right on schedule in west-central and southwest Oklahoma. The 3 developing storms are near Altus, west of Hobart and just west of Clinton.
They are initially moving North/Northeast but will start turning more toward the Northeast as they continue to develop over the next hour.
One or more of these storms should be quite well developed by 3pm. On a day like today with the dynamics & instability as strong as they are, it would only take 60-90 minutes for a storm to mature and produce a significant tornado threat. I'm not saying that will necessarily be the case with each of these 3 storms, but that is certainly a possibility.
As the afternoon wears-on, say toward the 4-5pm timeframe, the time required for a developing storm to mature and produce a tornado will decrease to under 1 hour as winds will have increased at all levels of the atmosphere across western & central Oklahoma ahead of an approaching upper-level storm.