A Severe Thunderstorm Watch posted a little while ago for the western counties of Oklahoma and eastern counties of Texas. Development is underway and a line of severe storms will make their way across the state this evening and into the overnight hours. Primary threat is high wind but some hail and a brief spin-up is possible.
Above is a map from the NWS with arrival timing, a simulated radar showing what radar should look like at around 1am, and total rainfall from this system as a whole. Some areas will see a lot, others very little. A Flash Flood Watch is posted for NE OK at this time.