Going back to April Fools' Day we've had rain on Friday or Saturday for each of the last three weekends -- that trend extends to four this weekend as we get another storm system organizing across the Plains and moving in to the Great Lakes and Northeast. Moisture streams out ahead of the storm center on Friday, bringing a chance of rain to the Philadelphia region perhaps as early as Friday afternoon but definitely for Friday evening and Saturday. Rainfall from this next storm system should not be as heavy as last weekend's precipitation but some places, especially north of the city, could pick up an inch of rain from Friday night into Saturday with the storm system. At this point widespread flooding does not look likely but it will reinforce a soggy ground that dominates to our north. The GFS (below) shows the first fingers of the storm system moving in on Friday afternoon, with the best chances of showers generally in the city and points south through west of town.
In fact the next several days after tomorrow look unsettled as the storm system responsible for this round of rain moves through but the frontal boundary associated with it does not immediately clear through. This would result in shower and thunderstorm chances continuing on Sunday, perhaps into Monday, before there's enough push north of the frontal boundary to give the region a couple of days of warmth.
Friday looks rather chilly to boot as clouds move in and winds off of the Atlantic result in a cool day with high temperatures in the lower 50's. The slow painful march towards consistent warmth continues...
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