Lower-than-expected temps brought some Monday morning snow. Warm and stormy conditions are expected midweek.

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Wintry conditions restarted in the late afternoon, with heavy snowfall in the Seattle area.

Early commuters hit traffic as the snow picked up, catching some by surprise and stopping a few Metro buses in their tracks. The state Department of Transportation advised drivers to exercise caution and “please pack some patience” in light of the  semitruck rollover that shut down Interstate 5. 


A thunderclap was heard in the downtown area, prompting the Space Needle to tweet out this dramatic video:

Monday morning’s surprise snowfall dumped more than 2 inches of snow across parts of the Puget Sound region. The National Weather Service has issued an advisory for accumulations between 1 to 2 inches for Seattle and the Eastside with the heaviest snow at elevations above 300 feet.

A convergence zone over the Seattle area brought lower-than-expected temperatures, turning what was forecast to be a mix of snow and rain into mostly snow, said Dustin Guy, meteorologist with the National Weather Service.

Rain and snow showers are likely to continue into Tuesday morning, with freezing temperatures overnight expected in the outlying areas of Puget Sound. That could mean some slick roads for the morning commutes Monday and Tuesday, Guy said.

The region saw snowfall Sunday night, Monday morning and Monday night, with accumulations across Seattle and in the Bothell and Redmond areas.

Some King County Metro buses in north and central Seattle and East King County are operating on snow routes, according to tweets from the agency. Check Metro’s website for information on your route.

Classes at Lake Washington School District are starting two hours late.

The high Monday is expected to reach 40 degrees in Seattle, far below the normal temperature for late February of 51 degrees. By midweek, a warmer air mass is forecast for the area, bringing wet and windy weather.

“Beware the Ides of March,” Guy said.

Seattle could tie the mark for the second-wettest February: 8.76 inches of rain in 1951. With 8.68 inches already fallen, the region needs less than a tenth of an inch more, which could come Monday, Guy said. But with just two days left in the month, he said we’re unlikely to break the record of 9.11 inches, set in 1961.