Thunderstorms and cooler temperatures are expected in Oklahoma today before skies clear.The National Weather Service said today will be windy with rain and occasional thunderstorms. High temperatures will be in the 50s to lower 60s, with temperatures falling into the 40s in the afternoon. Overnight lows will drop into the upper 20s to mid 30s, with generally cloudy skies and a chance of showers and thunderstorms in far southeastern Oklahoma.Skies will be mainly clear on Friday, with highs hitting n the mid 60s to lower 70s.