Fog cut visibility to a quarter mile at Gustavus, and it is coming back

Drivers and boaters around Gustavus and Glacier Bay saw visibility drop to a quarter mile or less through midday Tuesday, under a dense fog advisory that expired at noon. More fog is expected overnight.

"Low visibility could make travel conditions hazardous," the advisory said. Forecasters told anyone traveling to slow down, turn on their lights and leave plenty of distance ahead.

Patchy fog also extended into Icy Strait toward Sisters Island, though the advisory said it was beginning to lift there. No watches, warnings or advisories are in effect for the area now.

The Gustavus forecast issued Tuesday evening calls for patchy fog again between 10 pm and 4 am, then rain showers after 7 am Wednesday.

NOAA's Coast Pilot says navigation outside the main channels "is not considered safe without local knowledge."

Glacier Bay National Park directs visitors to the Gustavus Airport forecast for updated conditions.