Coastal Flood Watch

* WHAT...Up to one foot of inundation above ground level possible in low-lying areas near shorelines and tidal waterways (3.7 to 12.9 feet Mean Lower Low Water).

* WHERE...Eastern Essex, Suffolk, Eastern Norfolk, Eastern Plymouth, Barnstable, Dukes and Nantucket Counties.

* WHEN...From Friday afternoon through Saturday afternoon.

* IMPACTS...Roads remain passable. Low lying areas and roads near Nantucket Harbor, including Easy Street, may experience pockets of shallow flooding less than one foot deep.

* ADDITIONAL DETAILS...The exact timing for an approaching coastal low pressure remains uncertain. That will become important for peak surge around the times of high tides. Multiple tide cycles will be impacted, which combined with strong onshore flow may result in tides not lowering as well. Beach erosion will also be a concern, mainly for east-facing beaches.