Mostly mild Wednesday, but a few snowflakes possible by weekend

As warm air lifts from the area on Wednesday, there's a slight chance Long Island could see its first snowflakes of the season before the weekend, the National Weather Service said.

A weak wave forming off the mid Atlantic Coast and some upper-level disturbance forming from the north could cause light precipitation, mainly offshore, and bring a mix of snow and rain overnight Thursday and into Friday morning, said Tim Morrin, a meteorologist with the service's Upton office.

Morrin said the chance for any kind of snow is "less than 50-50" and if there is snow it's likely to cause nothing more than wet pavement.

"Right now, it's not just going to be enough to cause any significant accumulation," he said.

Morrin said most models show colder air and precipitation developing primarily offshore, east of Long Island. Models later Wednesday could provide a different look, "but what we're seeing so far is that it's mainly going to be offshore," he said.

Wednesday calls mostly for more mild temperatures, with daytime highs expected in the mid 60s and nighttime lows in the 50s.

Since expired, a dense fog advisory was extended until 10 a.m. in Nassau and until 11 a.m. in Suffolk, stretching north into Connecticut and east into New York City, the service said.

Clouds develop on Thursday, as cold air from the north helps push out the warm air, the service said. In addition, winds from the north pick up, blowing between 7 and 9 mph and gusting up to 20 mph at times.

Temperatures drop, with daytime highs in the low 50s and nighttime lows in the mid 30s.

Chance of precipitation after 8 p.m. Thursday ranges from 40 percent down to 20 percent by early Friday morning. The service calls for a slight chance of rain, mixing with snow, mainly after 2 a.m. Friday.

Clearing is expected after 10 a.m. Friday, with daytime highs in the mid 40s, the service said. Winds from the northwest, between 11 and 14 mph, also provide a colder feel.

Lows Friday night are expected to be in the low to mid 30s.

Saturday calls for sunny skies with daytime highs in the mid 40s.

Clouds return Saturday night and into Sunday, when daytime highs are in the high 40s, the service said.

Another front moves in by Sunday night, and the chance of rain increases to 50 percent. However, temperatures in the high 30s indicate mostly a rain event rather than any mix of snow and rain.