Record highs of 99 degrees are in the records book for Washington and Baltimore. The added moisture in the air coupled with the extreme heat made for a most uncomfortable day. As we head through the overnight, temperatures will slowly fall but humidity levels will slowly increase. The result will be an ultra warm and muggy evening. Another hot and humid day is on the way tomorrow. There is a chance a few thunderstorms could develop tomorrow afternoon. It would be welcome relief after temperatures approach the century mark. On Friday, a cold front will increase chances for thunderstorms as temperatures head into the lower 90s. Over the weekend, high temperatures will fall back into the 80s. And there will be a continuing chance for occasional thunderstorms on Saturday and Sunday.