PHILADELPHIA (CBS) -- A mild, but very wet weekend is setting up for the Delaware Valley with a soaking rain on the way. While Saturday doesn't look ideal weather-wise, it will be the "better" day of the weekend because Sunday is looking like a complete soaker. Rain will begin to develop later on this afternoon, so Saturday morning is the time to complete your outdoor plans and activities. A prolonged period of heavy rain will overspread the region tonight into Sunday. The heaviest rain is likely to occur along the I-95 corridor where some areas, including Philadelphia could see anywhere from 2-3" of rain.

This is just one model projection, but you can see the heaviest axis of rain sets up right along I-95 from Wilmington to Trenton with amounts a little bit lower both SE and NW.

Because of this threat for prolonged heavy rain, a Flood Watch has been issued for just about the entire region, excluding the Poconos. Low-lying flooding will be likely and flooding will also be possible on area streams, creeks and rivers through late Sunday.

FORECAST:

• TODAY -- Mostly Cloudy, Afternoon Showers Developing. High 53
• TONIGHT -- Periods of Rain, Heavy at Times. Low 44
• TOMORROW -- Periods of Rain, Heavy At Times. High 57
• MONDAY -- Lingering AM Shower, then Some Clearing. High 49
• TUESDAY -- Mostly Cloudy, Chance For Showers. High 42
• WEDNESDAY - Mild with Clouds. High 52