Thunderstorms are expected to develop across Eastern Oklahoma and Northwest Arkansas as the day wears on along a cold front pushing south across the region during the midday and afternoon hours. The environment ahead of the front will become moderately unstable by this afternoon. There will be enough wind shear to support storm clusters and thus the potential for damaging winds and marginally severe hail. Thunderstorm potential tonight is forecast to shift mainly south of Interstate 40 with severe potentials weakening after sunset.