The hills of the Livermore Valley look as if they were dusted with powdered sugar Tuesday.

In an unusual event, an isolated storm cell dropped snow over the region in the 680 corridor of the East Bay late Monday and into early Tuesday.

The stormy weather started on Monday when rain drenched much of the Bay Area, hail pounded some spots and snow levels dropped below 2,000 feet.

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The region's highest peaks and even the foothills saw up to an inch or more of snow.

Mount Hamilton, the tallest mountain in the Bay Area, was blanketed in white stuff while Mount Diablo received a thin layer.

Michael Sullivan of the East Bay tweeted a picture of a snow Diablo and wrote, "Mt Diablo looks like the Matterhorn at Disneyland."

Timelapse video of snowfall at Lick Observatory on Mt. Hamilton

"There are reports of snow all the way down to Fremont Peak, between Salinas and Hollister," says Roger Gass with the National Weather Service in Monterey. "Freezing levels were low enough for us to see snow at these lower elevations. This isn't completely out of the ordinary. We saw similar snow events last year when we had a more active winter."

The skies are forecast to be clear Tuesday and a second, even stronger storm is expected to hit Wednesday night and bring showers and possibly more snow to higher elevations through Saturday.

"It'll make for a messy commute Thursday morning," Gass says.