Winter Storm Warning: Expect difficult commutes on I-5, I-90 Tuesday morning – KING5.com

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SEATTLE — Drivers should prepare for a slow and difficult commute on Tuesday morning after snow was predicted to fall through the night in some areas around the Puget Sound.
The system is expected to dump anywhere between two to eight inches of snow before departing Tuesday evening. Seattle is expected to get lesser accumulations while areas further north, like Bellingham could be dealing with eight inches by the time the flurries are over, according to the KING 5 Weather Team.
Temperatures are expected to get dangerously low further north, including in Whatcom, Skagit and Snohomish counties, dropping into the low teens and 20s.
Those with plans to travel across I-90 should consider rescheduling, as the mountain passes could see one to two feet of accumulation before the system moves on.
Western Washington Forecast
A Winter Storm Warning went into effect at 7 p.m. on Monday evening and will remain in effect until Tuesday at 7 p.m. for the Puget Sound, Kitsap Peninsula, the San Juan Islands and the central and south Cascade mountains. 
Accumulations of two to eight inches of snow could cause significant travel issues for areas impacted by the warning. Areas north of Seattle, like Bellingham are expected to get a majority of the snow. The mountains could get a significant blast, with a possible one to two feet of accumulations. 
A Winter Weather Advisory will go into effect at 7 p.m. Monday for the south Puget Sound, including Tacoma, Olympia, Aberdeen and Chehalis, which can expect to see from two to four inches of accumulation.
Tuesday morning
Overnight into Tuesday morning, the lowland snow becomes widespread across Puget Sound with areas from Olympia, Tacoma, Seattle, Everett, Mount Vernon and Bellingham seeing snow.
By mid-morning on Tuesday, the weather system pulls in milder air into the southwest interior and south Sound. The milder air will boost temperatures above freezing for Chehalis, Olympia and Tacoma, changing the snow over to a rain/snow mixture then eventually rain by later Tuesday morning.
At this time, it appears the rain/snow line will stay just south of downtown Seattle, closer to the King/Pierce County line. This rain/snow line will need to be closely monitored as it will have significant impacts on potential accumulations.
Tuesday afternoon
The rain or rain/snow mixture will continue into the afternoon hours south of downtown Seattle with all snow north of Seattle.
By Tuesday evening, the snow begins to depart the Puget Sound lowlands with only spotty lingering snow showers Tuesday night near central Puget Sound extending west toward the northern Olympic Peninsula.
Widespread lowland accumulations of 2-7 inches are expected by Tuesday evening. Areas farther south and near water see lighter accumulations of up to one inch with areas farther north and the higher hilltops seeing closer to four inches.
The favored areas to see higher accumulations include the Cascade foothill communities of King and Snohomish counties, north of Seattle near Everett and across the northern Olympic Peninsula.
Snow that accumulated in Tacoma and Olympia on Monday night could melt as snow transitions into rain on Tuesday. If the rain/snow line shifts farther north into downtown Seattle, this will drastically reduce potential snow accumulations for the Seattle metro area. This is not expected to be a major snow event for the Seattle area, according to the KING 5 Weather Team.
Accumulations will be enough to impact travel, especially in the hillier communities, on secondary roadways, and on elevated roads, bridges and overpasses.
The Cascade passes will see up to two feet of snow Monday night through Tuesday. Pass conditions will likely be dangerous so check the pass conditions before venturing out over the mountains.
It’s recommended those looking to travel on Tuesday reconsider and try again once this system has passed.
A Winter Storm Watch went into effect Monday night, continuing through Tuesday night for the Cascade mountains.
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