As Tuesday's rain comes to an end, colder air surges in thanks to a cold front. By the weekend, computer guidance shows the chance for a storm to hit Long Island.
After midnight, temperatures dip, skies clear, and winds pick up. This could lead to icy spots Wednesday morning for the bus stop and morning commute. A surge of cold air will keep clouds around Wednesday, and a weak upper-level system may bring a flurry or two to Long Island. Thursday looks to be a better day with more sunshine, but the biting wind remains. Highs are expected to be in the mid 30s Wednesday and Thursday with overnight lows in the 20s.
Heading into Friday, model guidance diverges a bit regarding a storm that will bring snow and ice to the Plains mid-week. This storm, so say the computers, has fairly weak effects for Long Island by the time it hits late Friday into Saturday. When it hits the coast well south of Long Island, that's where the differences are.
The last few runs of the GFS model have been back and forth for the early weekend storm. From Tuesday afternoon's run, it brings the low up the coast but close enough where Long Island gets a good dousing late Saturday; cold air never hits the coast. The European model's latest shows the storm headed offshore, but snow backs in on its northwest side, clipping Long Island with a light accumulation. The Canadian model shows such snow on the backend as well.
With model guidance far apart for a storm a few days away, the forecast cannot spread beyond "a chance of rain and snow" for the weekend, but it will bear watching.