Flood Advisory In Place Across Philadelphia Region

A flood advisory is in place across the Philadelphia region through noon as heavy rain is expected to linger for much of Sunday. Another inch of rain is expected to fall this morning and up to two more could fall by the end of the day. As much as two inches fell overnight, the National Weather Service said.

The following counties are under flood advisory: Bucks; Chester; Delaware; Montgomery and Philadelphia. Once the flood advisory expires at noon, a flood watch will remain in effect through the day.

Forecasters with the National Weather Service say doppler radar and automated rain gauges show heavy rain on the way, which will cause urban and small stream flooding in the advisory area.

"The axis of heaviest rain will shift slowly northward today, from Delmarva and southern New Jersey early this morning to the I-95 corridor and the Lehigh Valley late this morning and this afternoon," the NWS said in its flood advisory.

The following areas will see the most precipitation:

Forecasters are also warning about foggy conditions. Though widespread dense fog has slowly improved this morning, visibilities are still generally between a half mile and two miles in most of the region, forecasters with the NWS said. "Visibilities may be locally reduced to a quarter mile in spots," a special weather statement said.

That combined with the heavy rain will make travel difficult. "If driving this morning, slow down and maintain extra space from vehicles in front of you," the NWS said.

The rain will move out by Monday, when party sunny skies are predicted.

Here is the forecast:

Sunday: Rain. Areas of fog. High near 58. East wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

Tonight: Rain likely, mainly before 2am. Patchy fog before midnight. Otherwise, cloudy, with a low around 41. Southwest wind 8 to 10 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Monday: Partly sunny, with a high near 45. Northwest wind 7 to 9 mph.

Monday Night: Mostly clear, with a low around 25. North wind around 6 mph.

Tuesday: Mostly sunny, with a high near 40. North wind around 6 mph becoming light and variable.

Tuesday Night: A slight chance of rain before midnight, then a slight chance of rain and snow between midnight and 3am, then a slight chance of snow after 3am. Mostly cloudy, with a low around 31. Chance of precipitation is 20%.

Wednesday: Partly sunny, with a high near 51.

Wednesday Night: A chance of rain. Mostly cloudy, with a low around 41. Chance of precipitation is 50%.

Thursday: A chance of rain. Mostly cloudy, with a high near 59. Chance of precipitation is 40%.