* WHAT. For this morning's Coastal Flood Advisory, less than 1 foot of inundation above ground level in low-lying areas near shorelines and tidal waterways (11.4 to 11.6 feet Mean Lower Low Water). For this afternoon's Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low- lying areas near shorelines and tidal waterways (12.6 to 12.8 feet Mean Lower Low Water). For Sunday afternoon's Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low- lying areas near shorelines and tidal waterways (12.3 to 12.6 feet Mean Lower Low Water). * WHERE. Suffolk MA and Eastern Norfolk MA Counties. * WHEN. For the first Coastal Flood Advisory, until 5 AM EDT early this morning. For the second Coastal Flood Advisory, from 11 AM this morning to 5 PM EDT this afternoon. For the third Coastal Flood Advisory, from noon to 6 PM EDT Sunday. * IMPACTS. Shallow pockets of flooding less than one foot deep affects the lowest lying areas along the coast, including Morrissey Boulevard in Boston.