Rain and Snow Showers Forecast for Seattle Area; Winter Storm Expected for Whatcom County

Bryan Dijkhuizen

A warm front will come up from the southwest today and overnight, causing snow levels to rise fast, except the Northwest Interior and Cascade foothills, where they will remain stable.

On Thursday, a warm front will stall over Western Washington, bringing rain and sleet with it.

Friday will see the passage of a following cold front with showers becoming less frequent. The weekend seems to be generally dry, thanks to an upper ridge of high pressure above the region.

The prediction is still on track in general, and it is being assessed ahead of the system's arrival tonight and continuing through Thursday.

In low-lying locations, the likelihood of snow has diminished, and warm air advection seems to be becoming more prominent with the warm front, decreasing the likelihood of snow in low-lying areas.

Keep an eye out for updates. The prior debate may be seen at the link below, along with an updated section on aviation and maritime transportation.

Throughout the afternoon and evening, a warm front will move into the region, pushing cooler air closer to the surface to the south.

Temperatures will initially be just above freezing and barely chilly enough to provide a danger of lowland snow in the early stages of the storm.

Fraser outflow into the Strait of Juan de Fuca over Western Whatcom County, rising easterly flow through the Cascades, and mild northerly or easterly flow elsewhere will all help to increase the possibilities of lowland snow in the next days and weeks.

It is expected that the Fraser outflow will maintain cold air over Western Whatcom County for the greatest period, resulting in 3-6 inches of fresh snow tonight.

The San Juan Islands, Western Skagit County, the Strait of Juan de Fuca, and the east side of the Olympic Mountains will warm up a bit quicker tonight and should experience a little less precipitation.

These areas can get 1-3 inches of additional snow tonight before the snow turns to rain. 1-2 inches of rain might fall in sections of the East Puget Sound Lowlands near the foothills as a result of easterly winds over the Cascade Mountains.

Lowland snow accumulations are predicted to be an inch or less, if any at all, tonight in other parts of the country.

Keep in mind that lowland snow accumulations will be very sensitive to temperature and precipitation rates, as well as the speed with which warm air comes in, making this a delicate and difficult prediction to make.

After midnight tonight, southerly winds will develop, causing snow levels to rise substantially, thereby removing any danger of low-lying snow for the time being.

As the air mass transitions, there may be a short period of freezing rain in cold pockets such as the Hood Canal region tonight, but the hazard seems to be rather limited given the absence of any major cold air in situ at the time.

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