The Delmarva region is in for a series of weather changes beginning tonight as a warm front moves northward into the area, followed by multiple cold fronts over the weekend. The first cold front is expected overnight Saturday into Sunday, bringing a chance of isolated thunderstorms and periods of moderate to heavy rainfall. A secondary cold front will follow on Sunday night. High pressure will then build in from the Great Lakes, leading to drier and calmer conditions starting Monday and lasting through the midweek.