Updated Friday 3:15 p.m.
Yes, snow is still in the forecast!
Figured that'd get you to keep reading. It's still a few days off and in the meantime, it's regular ol' Seattle rain.
A weather system is moving through tonight and it'll remain rainy with lows around 40.
The rain will briefly taper to scattered showers Saturday morning, then rain will redevelop in the afternoon as the most important Seattle storm of all time (slight exaggeration) moves in Saturday night. Expect a rainy Saturday night with showers lingering into Sunday.
This storm is still warm enough for rain in the lowlands, but cold enough for very heavy snows on the mountains. A Winter Storm Watch is in effect for the Cascades from Saturday afternoon through Sunday afternoon for as much as 1-2 feet of snow -- Snoqualmie toward the 1 foot; Stevens toward the 2 feet.
It's behind this front that lowland temperatures will begin their trek downward toward freezing, but it'll take a bit to get there. But while it'll be cooling on the ground, it'll be getting really cold aloft and that will create atmospheric instability. Thus, Sunday afternoon and evening will feature scattered showers and some could have moderate to heavy rain, with perhaps a little lightning, small hail, and maybe even some wet snow. Snow levels are only expected to be down to 500-1,000 feet by then, but intense showers can briefly knock snow levels down 500-700 feet lower so it's possible we may see some wet snow in spots, especially in the Convergence Zone area. Road temps are warm, though, so nothing major expected.
Isolated to scattered snow showers with little to no accumulations are expected Sunday night with lows in the low 30s.
A weak system drops in from the northwest on Monday, bringing the return of light showers with it. Temperatures by now should be cold enough that these are snow showers anywhere -- even in Seattle -- but again, we're not looking like much moisture. Most forecast models are painting accumulations at 1 inch or less through Monday night. There is a chance with our wacky microclimates that a few spots could eke out a little more, but overall this is not looking like a significant snow event.
After a decent freeze Monday night with with lows in the 20s, a few flurries might be around Tuesday but it'll be dry day with highs only in the upper 30s to near 40 as cold air continues to filter in from B.C.
Forecast models continue to differ on our next event. They agree that typical Pacific storm with what normally would be a rainy day (kinda like today) is coming in for the middle of the week. With the cold air already in place, there is potential for the rain to begin as a widespread snow until the storm can scour out the cold air. Timing? Good question. European model has been pretty adamant it'll be Thursday. American model has been more along the lines of Wednesday morning, but in its latest run, trended later toward Wednesday evening. No word if the Euro model is just sitting there snickering waiting for the GFS to eventually agree on Thursday.
Suffice to say, it appears Wednesday will be cold with increasing clouds at some point, and sunshine until they do. Let's say a high of 40.
Then as mentioned signs point that either Wednesday evening, night, or Thursday could start with a period of widespread snow across the region, then a gradual transition to rain. Don't ask about accumulations this early, as you'll get a snarky answer like "0 to 8 inches" with the uncertainty this early remaining as great as it is :) Once the cold air is scoured out, you'll likely hit the mid 40s but you'll be in the low 30s until it does. Caveat: If the storm waits long enough to get here and the cold air push from B.C. wanes, it's possible we gradually warm up enough to where it just begins as rain, or the snow period is quite brief. Too early to tell by now, but just keep that possible midweek snow in your planning stages.
By the end of the week, just back to regular old Seattle rain and highs in the mid 40s, which will surprisingly feel warm coming off the warmest November on record.
Have a great weekend!
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Today's Record Temperatures