Severe thunderstorms…including the possibility of very large hail… damaging wind gusts… and isolated tornadoes will be possible through the late afternoon and early evening hours in portions of western North Texas and southern Oklahoma. At 6 PM…a cold front stretched from near Marietta… to Tishomingo… to McAlester. Thunderstorms had already developed ahead of the cold front in north central Texas. Through 7 PM… a weakening thunderstorm will move into portions of Knox and Baylor counties in Texas southwest of Seymour… with heavy rain and small hail possible. Attempts at thunderstorm formation are also being seen in far south central Oklahoma near Marietta… Ardmore… and Madill. Focused lift along the front… combined with large scale lift from an approaching storm system… should continue to yield isolated to scattered severe thunderstorms southeast of the front this afternoon and evening. Through 9 PM…temperatures south of the front will mostly be in the 70s…while temperatures north of the front will fall into the upper 50s to lower 60s. A northeast wind at 10 to 15 mph with gusts to 25 mph will affect locations northwest of the front. The front should arrive at a line between Madill and Atoka by 7 PM…then become nearly stationary with further movement dependent on thunderstorm outflow.