A dense fog advisory is in effect for Long Island from midnight to 9 a.m. Saturday, the National Weather Service said, warning of visibility of a quarter mile or less at times.
Drivers are advised to slow down, use high-beams and leave plenty of room ahead in case the have to stop suddenly, the weather service said.
Friday morning's dense fog dissipated, but is expected to make a return, thanks to southerly, then easterly winds bringing moist air off the ocean, said Joe Pollina, weather service meteorologist based in Upton.News 12 Long Island meteorologist Rich Hoffman said the fog will develop overnight and last into the morning hours, through Monday morning.
Some low clouds, fog and drizzle could appear Saturday and Sunday mornings, with Saturday looking at highs of 65 to 70, up to the mid-70s for Sunday, Mother's Day, Hoffman said.
"The fog may linger a little bit longer along the South Shore and East End" where it will be slightly cooler, he said. The warmer spots are expected to be on the North Shore.