Imagine a fire hose blasting not water but a stream of snow. Now imagine it's aimed right at Stevens Pass.

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Imagine a fire hose blasting not water but a stream of snow. Now imagine it’s aimed right at Stevens Pass.

That, according to forecasters, is what’s behind a winter-weather advisory for the Cascades in Snohomish and King counties in effect early Friday morning.

“We’ve had a fairly persistent convergence zone all night and earlier this morning that’s driving the advisory,” meteorologist Kirby Cook said in the Seattle office of the National Weather Service.

By the time the advisory ends at noon, an additional 6 inches of snow will have fallen on Stevens Pass and somewhere between 1 and 3 inches of snow on Snoqualmie Pass, he said.

By the time an advisory for snow in Pierce and Lewis counties ended at 5 a.m., an additional foot of snow had fallen at Paradise on Mount Rainier, Cook said.

It’s not the first snow advisory of the year nor is it that unusual, he said.

Nevertheless, he said, “It’s been a good round.”

Down in Seattle, the skies are expected to start clearing out on Friday afternoon and the weekend is expected to be warmer. Sunshine is predicted for both Saturday afternoon and most of Sunday, with highs in the upper 50s and lower 60s.