I don’t want to exaggerate the situation, but I do think some snowflakes will fall on parts of the western lowlands next Tuesday and Wednesday.
To illustrate, you can see below sea level pressure and temperature (925 hPa, at about 800 m) at 4 a.m. Tuesday. The blue color is cold enough for snow—and such cold air covers most of the area.
Daily highs and lows in Seattle next week from the National Weather Service’s National Modeling Complex, showing a trend of cooling down to mid-40s peaks. Not nearly as cold as May. 12, but Tuesday and Wednesday mornings will be cold enough for snowfall.
But will there be moisture?
A front will move through tonight, bringing rain to the western lowlands and light snow in the mountains. In fact, the latest radar images clearly show that the rain will soon reach Puget Sound.
Snowfall in the mountains tomorrow will be relatively modest (see totals through 1 a.m. Saturday morning below). Just a few inches.
The second half of Friday, Saturday and most of Sunday will be relatively dry, with lows high around 50F. Ideal for walking, running or cleaning the garden.
But then late Sunday and Monday morning, a fairly strong higher trench will move in (see below), bringing cooler air and some rain on Monday and early Tuesday.
Will there be any precipitation around when it’s cold enough to snow Tuesday morning?
Snowfall totals through Tuesday morning from Central Europe modeling show plenty of snow in the mountains and yes, a light strip near SeaTac and more snow in Southwest Washington (see below).
Keep stable. More details as we get closer in time.
