Current Weather Notices in Force:
Seattle / Tacoma & Puget Sound Subway Area without Snohomish Co.: Winter Weather Advisory from 16:00. Sunday until 16:00 Monday for 2-4 inches of fresh snow. Winter Storm Watch Monday morning until Tuesday for 5-10 "of new snow turning into possible freezing rain.
Snohomish County / Northwest Interior / Olympic Peninsula: Winter Weather Recommendation from 4:00 pm Sunday to 4:00 am Monday New Snow Winter Storm Watch Monday morning to Tuesday for 5-8 "fresh snow.
SW Interior: Winter weather recommendation from noon Sunday to midnight for 2-4 inches of fresh snow. Winter Storm Watch Monday morning until Tuesday for 5-10 "fresh snow that turns to freezing rain.
Coast: Winter weather recommendation from noon Sunday to midnight for up to 2" of snow.
SEATTLE – Maybe you? I spent the last day or so paddling a way out of the second winter storm this month.
Mother Nature is going to ruin her work with a few inches of snow in the forecast.
A third winter storm was blowing through the Puget Sound area at 1 to 3 inches Sunday night, with a stronger fourth storm threatening Tuesday late Monday, with several inches more snow likely. But this last storm has the potential to have a serious impact on the region, only this time we have some new wrinkles.
Sunday's Storm First …
The Storm Comes In Sunday afternoon would normally cause Seattle Freak Out Level 8 to fail, but now it appears in comparison to the first both of which we have already gone through, like a breeze. A weak low-pressure area is developing near Vancouver Island on Sunday morning and will drift off the coast. Then in the late afternoon, through the Puget Sound area and the I-5 corridor, it will quickly wander inland through the evening. All over West Washington this will likely see little snow.
It is expected that the snow will develop time lapse at 3:00 pm and will snow until around 9:00 pm. Most forecast charts show general 1-2 inch accumulations with scattered spots that could see 3-4 inches. For many, it may be difficult to notice on the ground with 6-10 ", but these cleanly cleaned surfaces have been buried again.
Sunday night remains cloudy, not as hard as a frost, but still a low Lows in the mid-20s to near 30.
And then the larger winter storm on Monday …
Monday morning is a very short break – the road will be snow-free, with only tackling the remaining problems of past snow and ice, the Monday night commute does not look snow-free.
A much stronger storm – perhaps the strongest in the series – has already been developed in the Gulf of Alaska, but has a view of Western Washington but since it has spent quite a lot of time over the Pacific Ocean, this storm has 1) more moisture and 2) has tapped into some warmer air Crucial to the course of the storm, with multiple scenarios in play and possibly WI Slightly different influences throughout the region.
In general, it is still cold enough that the storm, when the storm comes, everywhere starts as snow and develops on Monday afternoon from west / southwest to east / northeast. Monday afternoon or evening is expected to heavy snowfall. Similar to Friday, commuting on Monday night is in danger. We were lucky on Friday that it was just warm enough that the snow did not stick to the clogged highways until the deadlock subsided. This may not be the case on Monday, especially if the snowfall rate is higher.
Now the monkey key comes into play: Unlike the last two storms that have moved off the coast and into our south, the cold north wind keeps us side of the system and everyone who has snow, this storm comes like a more traditional Rain track from the west in front of the Pacific. On the north side of the storm is the snow side, as the wind is kept from the cold north. Being on the south side is the warmer side when you get milder sea winds from the southwest.
Depending on where exactly this storm breaks in, some areas – possibly many – may see a transition to freezing rain their way to maybe then just straight rain later. Heavy snow from snow to freezing on snow from snow? Eww.
Prediction models still do not match on the exact storm trail; Some keep them further south, which leads to higher sums of snow in the region without the rain changing. Others move farther north, leaving more of the region in the snow-to-freeze rain-to-rain situation.
The farther north you are, the more likely this is a total snow from start to finish. Conversely, the further south you are, the more likely this transition will be to ice cold rain and possibly even rain. Where does this transition take place? That's the million question.
Right now this line is … Downtown Seattle and Bellevue. If you live north of the city you will probably see higher amounts of snow. If you live in the south of the city, you have a higher chance of a wintry mix transition. Driving further north will give you a better chance of getting stronger snow. Further south, it is warmer and faster to switch to ice cold rain and rain.
Of course, icy rain brings its own headache and makes power outages more likely as the trees, roads and sidewalks are more heavily loaded. Therefore, be prepared for at least additional power outages and extremely treacherous conditions.
Oh, and do not even think about coming over the mountains, where Monday's tower may be one to two meters of fresh snow. Winter storm watches are also effective there …
The snow / mix / rain will decrease during the day Tuesday, whereby it dries in the night to Wednesday. This storm may have a single silver in the form that mixing in the warmer air will drive us out of the deep freeze pattern into a "it's just cold" pattern. More weather systems are due towards the end of the week, but now snow can occasionally rise higher off the sea level, providing more difficult predictions where altitude and time of day affect who gets snow and who gets rain, unlike everyone gets snow. Easier on the work paths; Harder for the accuracy of the forecasters!
Although we may see the 40-degree mark towards the end of the week, the 45 remains elusive for the foreseeable future.