Fog may reduce the visibility to around a half mile in several locations this morning. Locally dense fog, with visibility of a quarter mile or less will be possible. Travelers should be prepared for quickly changing visibilities during the morning commute. Slow down and use your low beams in the fog.

* WHAT. Southwest winds 10 to 15 kt with gusts up to 25 kt and seas 3 to 5 feet. * WHERE. In Massachusetts coastal waters, Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket. In Rhode Island coastal waters, Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island. * WHEN. Until 5 AM EDT Wednesday. * IMPACTS. Conditions will be hazardous to small craft.