An onshore flow will develop later tonight and continue into Monday and Tuesday. It looks to be a mostly cloudy period with some sprinkles and showers possible. There could also be some spotty fog and drizzle. The most likely time for some measurable precipitation is when a disturbance approaches Monday Night into Tuesday.
Another challenging forecast for the middle part of the week ahead as a cold front is expected to move southward towards the region before coming to a stop. It may stop short of moving through our region. It is then expected to lift back to the north as a warm front. There remains decent uncertainty with the progression of the warm front. We are presently thinking it will lift far enough north for Wednesday and Thursday to be mild with some instability developing as we sit in the warm sector. We may be close enough a trigger for an isolated shower or thunderstorm. The best chance of a shower or thunderstorm will be north of Philadelphia.
A potent cold front should arrive Friday Night with showers and thunderstorms likely for the entire region. Gusty winds and heavy rainfall are possible with any thunderstorm.