* WHAT. For the High Rip Current Risk, dangerous rip currents. For the Friday afternoon Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.7 to 4.1 feet Mean Lower Low Water). For the Friday NIght Coastal Flood Advisory, less than 1 foot of inundation above ground level expected in low- lying areas near shorelines and tidal waterways (3.6 to 3.8 feet Mean Lower Low Water). For the Saturday afternoon Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low- lying areas near shorelines and tidal waterways (3.8 to 4.4 feet Mean Lower Low Water). * WHERE. Dukes MA County. * WHEN. For the High Rip Current Risk, through this evening. For the first Coastal Flood Advisory, from 11 AM this morning to 6 PM EDT this evening. For the second Coastal Flood Advisory, from 11 PM this evening to 5 AM EDT Saturday. For the third Coastal Flood Advisory, from 11 AM to 5 PM EDT Saturday. * IMPACTS. Flooding of lots, parks, and roads with only isolated road closures expected. Rip currents can sweep even the best swimmers away from shore into deeper water.