An upper level storm system will move across the southern Plains today, with an expansive area of widespread rain and thunderstorms. The main concern today will be from sustained heavy rains, with 1 to 3 inch amounts likely for some locations. This may cause localized flooding for low lying areas through tonight. The better severe weather threat will remain well southeast of the area. However, a few stronger storms are possible across southeast Oklahoma. The main hazard with these storms is small hail up to penny sized. As the upper low moves across northwest Arkansas tonight, rain may mix briefly with snow by early Sunday morning. No accumulations are expected. Rain will clear out of the area by Sunday afternoon with temperatures back in the mid to upper 70s by Monday. It will remain windy through the first part of the week. The next storm system will approach by Wednesday with a chance for showers and storms, some of which could be severe given forecast wind and instability fields.