Cold weather advisory in effect overnight Thursday, and a developing coastal storm likely to bring more snow to East End this weekend

More arctic air will descend on the Long Island region late tonight with temperatures in the single digits and wind chill values as low as 6º below zero overnight.

A cold weather advisory is in effect from midnight tonight until 10 a.m. tomorrow, the National Weather Service said this morning.

Sub-zero wind chills will become more widespread over the next couple of nights, the weather service said in a statement. Daytime highs will reach only the upper teens to the low 20s, today, tomorrow and Saturday, according to the National Weather Service in New York.

It will remain dry with clear to partly cloudy skies through Friday night and the first half of Saturday, the weather service said.

The NWS forecast is presently calling for snow to develop after 1 a.m on Sunday and continue through the morning, likely ending by 1  p.m. across much of the region, though it could continue until evening “for some eastern sections,” the weather service said.

Forecasters are watching the expected development of a coastal storm off the southeast coast. 

“It remains a bit too soon to determine impacts with any confidence at this point,” the weather service said. “Far eastern portions of the region continue to have a relatively higher chance at seeing some accumulating snowfall compared to the rest of the region, along with stronger wind gusts.” There may be minor coastal flooding, according to the forecast.

Still, as of this morning, “the most likely scenario is the nearest of misses,” the weather service said. “However, some impacts cannot be completely ruled out, especially further east as there remains some room for the modeling to wobble slightly further west which would bring eastern portions of the region in play for some minor to moderate impacts.”