Radar is a bit generous in terms of precipitation depicted compared to reality this morning. There is some rain on the western front but some of the precipitation depicted below is not reaching the ground initially this morning. We won't get rained upon all day...and in today's case, southern areas get more rainfall than north. However, this shield of rain that is depicted does stretch back to Chicago and as that rain moves eastward in association with the disturbance, some of this rain will reach into the Philadelphia region later on this afternoon.
The northward extent of the rain varies on the models -- the GFS and EURO provide a half inch of rain as far north as Allentown -- mostly with the afternoon and evening, while the NAM limits that northward extent of rain to Bucks and Montgomery Counties, with just showers to perhaps Allentown. There will be a pretty sharp rain/no rain line across our northern areas with this system as high pressure across New England will funnel dry air down and attempt to eat away at the rain's extent. The question is just how far north the rain gets -- at this point, I think it may rain into Allentown but they would not see much in the way of steady rain...possibly not on the levels depicted by the GFS and EURO.
Today, expect a gray day with rain spreading in during the midday hours, especially for the city. North of the city, a period of rain looks like a good bet towards dinner and in the evening. Rainfall totals range from a couple of tenths of an inch in Pennsylvania to as much as two-thirds of an inch south of the city.
Update, 7AM: Parts of Delaware are already getting light rain, with the edge of rain at this point running from Lancaster to Wilmington to Millville to Cape May. Rain is moving east-southeast for the most part so rain will be slow to spread northward through the day.
More: Current Weather
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