It was another day with a similar outcome; start off with some sunshine, cloud up and have rain falling, and still reach a record high. We did that today(although not in that exact order) as the high at Philly Int'l Airport was 68 and breaking the old record of 64 set back in 1998. The kicker is that the high was achieved at 9:48 in the morning!
Although we only measured four hundredths of rain during the day(that's 0.04") that will change overnight as heavy rain along the frontal boundary will slide north; there is the potential for over an inch to rain to fall from after Midnight, through the morning commute, and then dwindle down by the afternoon. There may be some ponding on roadways, but for widespread flooding I feel the chances are very small; the areas that normally flood with heavy rains may be subject to flooding this time around. It's nothing to fret about though.
As for temperatures overnight Sunday lows will hold around the lower 60s under cloud cover and they will stay around 60 through Monday morning as it rains; it will not be until the front pushes east and we get that northwesterly shift in the wind that temperatures will drop. Right now the time frame for that to occur should be by lunchtime as you will notice the wind change(check out flags flying) and then the cooldown begins through the 50s and eventually settle into the 40s by sunset before arriving down below freezing overnight.
Christmas Eve looks dry with highs in the lower 40s, but there is a piece of energy that will pass by to the north and bring some clouds(maybe some snow showers as well to give people some hope of a White Christmas, but I wouldn't bank on it). Behind it will be some very cold air for Christmas with highs just a touch over freezing. Mind you our average high is 43 and the average low is 25 so we get a few days above average and of course we go the other way as well.
If you'd like to track the rain and see the 7-day forecast you can do so at www.scottderekwx.com/forecast.html.