Statement as of 3:45 AM EST on February 21, 2018
Expires 1:00 PM EST on February 21, 2018
... Dense fog advisory now in effect until 1 PM EST this
* location... islands of Nantucket, Marthas Vineyard, Block Island
* visibilities... one quarter mile or less at times.
* Timing... through 1 PM EST.
* Impacts... poor visibility will result in hazardous travel
A dense fog advisory means visibilities will frequently be
reduced to less than one quarter mile, for at least 3 hours. If
driving, slow down, use your headlights, and leave plenty of
distance ahead of you.