Timeline: Potential light lowland snow overnight into Monday

There’s a low chance for some snow in the lowlands from Sunday night through Monday morning. Here’s what will happen and when.

SEATTLE – Low chance of snowfall in lowland areas from Sunday night to Monday morning.

While the snow is not expected to be much or wide enough to make a travel impact on the lowlands, don’t be surprised if you see a few snowflakes blending into the early Monday morning showers.

Set the weather

Lowland snow potential and setting is the classic lowland multimillion-dollar question of whether moisture and cold air should pile up to produce snow.

A cold front responsible for rain and snow in the mountains on Sunday morning is opening up a cold air mass at the same time an upper area of ​​low pressure off the coast of Washington has some very cold air in the area. middle and upper atmosphere.

The depression will slowly meander and move south along the Pacific Northwest Coast, keeping the possibility of rapid rain in the forecast Sunday night through Monday.

The establishment of this enough power and lift to create areas of sporadic precipitation and filter colder air into the surface area creates the potential for some areas of rain/snow mix in the region. lowland.


While this is a low-confidence forecast and timeline, the current thinking is that rain will reappear in western Washington on Sunday night.

Rain could combine with a few snowflakes late into the night through early Monday morning in the Puget Sound Lowlands. This includes Olympia, Tacoma, Seattle and Everett.

However, favored areas would be the higher hills near these areas above 400 feet. Areas below 400 feet are likely to see mostly rain but a wet snowflake or two is possible.

Early Monday morning radar

The chance of snow increases at peak times for lowlands in Skagit and Whatcom counties as northeasterly winds filter colder air into western parts of these counties. Clallam County may also experience light snow Monday morning. Interstate 5 and Highway 101 could see this light mix of snow for commutes Monday morning but are not expected to have an impact on widespread travel for now. If a full-blown snowfall occurs Monday morning in Skagit and Whatcom counties, with cooler temperatures, there could be short, light snow accumulations near Interstate 5.

Scattered lowland rain/sleet could continue Monday afternoon for similar areas in Clallam County and extend south along Hood Channel and into the Kitsap Peninsula. The northern portion of the Hood Canal has the best chance of seeing a build-up of light Monday afternoon and evening.

With an increased possibility of overhead snow near Highway 101 in Clallam County Monday afternoon and evening, some light build-up on elevated surfaces and some side roads is possible. If this happens, there can sometimes be minor travel impacts to the area.

Video timeline discussion

Lowland areas have the best chance for rain/snow interweaving

It should be re-emphasized that this is not a major impact event for the Puget Sound Lowlands at this time and most areas will see more rain than snow with temperatures above freezing in many areas. area.

Despite temperatures hovering above freezing, there’s still enough cold air and humidity that could lead to a rain/snow mix early Monday morning for Olympia, Tacoma, Seattle and Everett. Farther north, into Skagit and Whatcom counties, slightly cooler air could increase the chance of snow for western parts of the counties.

While widespread accumulation is not expected, a heavier snowfall could result in small accumulations on grassy and tall surfaces anywhere in the lowlands west of Washington. It is too difficult to determine which areas may see heavier snowfall and may lead to some small accumulations.

The broad overview suggests that priority areas to see light snow accumulation would be in northern Clallam County near Highway 101, western Whatcom County near Interstate 5, and along the Hood Canal near Highway 101. These areas include Port Angeles, Sequim, Shelton, Blaine, and Bellingham.

If you observe light build-up on the road, please give yourself some extra time on your way to work. Temperatures are expected to remain near or just above freezing on Monday morning, so any light build-up will quickly melt through Monday.

Modeled snow accumulation forecast

CAUTION: It should be noted that this patterned snow accumulation is used to describe which areas are preferred to see snow. Make accurate cumulative forecasts with just a grain of salt.

As you know, forecasting snowfall in the lowlands can be difficult, and even small changes in temperature, humidity and even wind direction can lead to significant changes to the snow forecast. fall. Keep checking back for updates on these evolving, agile forecasts.

https://www.king5.com/article/weather/timeline-tracking-potential-lowland-snow-overnight/281-001b6540-f558-4956-8a49-99e969918969 Timeline: Potential light lowland snow overnight into Monday

Edmund DeMarche

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