Once again, snow is in the picture for Long Island, mostly for late Saturday into Sunday, with around 3 to 4 inches the most likely snowfall scenario, forecasters said.

Locally higher amounts would be possible, depending on where snow bands set up, said Brian Ciemnecki, a National Weather Service meteorologist based in Upton.

The forecast is as of Friday evening, and is a slight downgrade from amounts mentioned earlier in the day.

It’s “not a very strong storm system, but it will bring us some accumulating snow,” said Bill Korbel, a News 12 Long Island meteorologist. “For the most part the rate of snow should be such that it won’t accumulate much on our major roads and highways.”

As for ultimate snow amounts, “whether we get only an inch or two or possibly double that amount is still uncertain at this time,” he said Friday evening.

In a hazardous-outlook statement, the weather service said that “a developing low off the mid-Atlantic coast will likely bring an accumulating snowfall from late day Saturday into Sunday morning,” with a chance of 6 inches or more. That, however, is a potential and was not likely as of Friday evening.

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Look for precipitation to start Saturday morning, possibly with some light rain and snow, switching to a period of all rain as afternoon temperatures rise to expected highs in the upper 30s to near 40, Ciemnecki said.

Once the sun sets, that moves back to a rain and snow mix, then to all snow through the overnight hours into Sunday morning.

As with any forecast, uncertainties remain, he said. A faster drop in temperatures Saturday could mean a quicker changeover to snow, for instance.

The weather service’s next major forecast update is expected Saturday between 4 a.m. and 5 a.m., based on analysis of computer models running overnight.