Wind direction is usually a good indicator. Winds look like they are out of the ENE in most of Maryland. Would seem to indicate the warm front isn't there yet. I've had some sun already in the Colesville, MD area. We've seem some cases in the past where even areas just north of the front can get action if something anchors along the front. Today is far from a guarantee on anything for anybody. But I'd definitely want to be south of DC as everyone has been mentioning. Southern MD and the Spotsylvania area might be a good place to be for action.