Another winter storm may be on its way to Southwest Washington and Northwest Oregon, bringing with it the possibility of a foot of snow between Sunday afternoon and Monday morning.

The National Weather Service in Portland issued a winter storm watch Saturday morning and lasting through 6 p.m. Monday. Heavy precipitation is expected to begin falling Sunday morning and, as cold air moves in, may transition to snow sometime in the afternoon, said Andy Bryant, a hydrologist with the weather service.

“Basically, the difficulty in the forecast is (determining), ‘Will it get cold enough to bring that snow level down to the valley floor?’” Bryant said.

It’s possible the greater-Vancouver area may get 6 to 12 inches of snow between Sunday night and early Monday morning. The snowfall would likely lighten up moving into Monday. “But, if we get several inches of snow that will obviously have a big impact on people’s Monday morning,” he added.

But, it’s also possible, Bryant said, that the area will just receive cold rain.