Snoqualmie Weather

 Exact timing and amounts of potential snowfall remain uncertain over next few days.  At this point roads shouldn't be impacted for Christmas eve dinner plans, with most of the wet snow threat tomorrow morning and limited to the highest hills, but Christmas morning could be dicey with colder air and potentially more precipitation. Let's start with tonight.  Cold air will be a trickle, but showers may increase.  With snow levels lowering from ~2000ft to ~1000ft, possibly impacting the highest foothills overnight into Christmas eve morning. I wouldn't be surprised if we have something a bit less impactful than this past Monday (20th).  Trace - 1" for areas like Eagle Pointe, Wilderness Rim. Christmas eve day I think we may be on the northern edge of a faster moving low pressure system.  But this will serve to pick up the Fraser outflow bringing temps down markedly, beginning up North with Bellingham in W. WA.  Again, most of the precipitation looks to be...

We are more than a month early from our usual Cascadia windstorm season.  In the three fall/winter seasons I've kept records of these windstorms (>= 40 mph).  The earliest in the season was on a Dec 1st (2019). And if my memory serves me, this is the earliest in the 13 years I’ve lived in Snoqualmie. Oct 21st - wunderground station KWASNOQU33 These winds don't usually show up until we get much colder (higher pressure) in E. Washington, then run-of-the mill frontal lows off the coast can easily trigger the push through the mountain gaps.  While we didn’t have the super chilled E. WA, we had an extremely low pressure center off the coast. We'll be keeping a close eye on Sunday's potential action for higher wind gusts than what we've seen today.  In the meantime, periods of boring old light/moderate rain tomorrow morning, hopefully breaking up before another unimpressive front moves through at least the first part of Saturday. Bomb cyclone #2 on Sunday.  Cl...

Warmer for a change!  On Saturday, several locations around Snoqualmie Valley reached 70°, in stark contrast from the first half of October, that clocked in an average high of about 57°.  Possibly right there with the record lowest average official high of 56.7° set in 1913 at Snoqualmie Falls (depending on differences in exact location, weather instrument accuracy, sun exposure, etc.- then and now). So the question making the rounds in the weather media the last week or so - Does a really cold start to October foretell a cold fall/winter season ahead?   Looking back at local data (station: Snoqualmie Falls) that was available for 122 years (1898-2010) shows the answer is .. not so much.  I looked at the coldest average high for 1H Octobers and worked upwards in rank until I had at least an n=30 (years). What I found was the coldest ~15th percentile bucket of first-half Octobers (calendar days 1st-15th) do not appear to show statistical significance in forecast...

A relatively mundane week ahead, though some models keep playing with a brief warmup mid-week.  Which many folks, admittedly myself included, have been longing for. We should remain dry though mostly overcast, Sunday and most of the day Monday, before some light rain looks to move back into Western Washington Monday evening into early Tuesday.  However, some of the ensembles have turned even drier, with perhaps only a sprinkle with the bulk of the moisture moving to the southwest of us. We begin to really widen the daily temperature ranges with the sun now up over 12 hours as we close in on the Spring Equinox in three weeks.  While Lows look chilly (in the low 30°s) Tuesday and Wednesday morning, a warm front makes its way through, warming Highs into the upper 50°'s, and even possible hitting 60° by Thursday.   weather.us The warmth is expected to be brief however.   A more organized system is expected next weekend, likely bringing a return of widespre...

  windy.com The southern portion of a so-called Atmospheric River begins to impact Washington state on Sunday. Expect showers to begin after 2pm.  A lack of east winds through the passes should allow for warming temperatures through the afternoon, which has already caused precipitation to change over to a rain/snow mix at Snoqualmie Pass.  Avalanche control has seemed to be an ongoing theme at Snoqualmie Pass lately.  Be sure to check pass conditions if you head over the pass this week. It has been an epic snow year indeed!  Back at home I know many folks are still repairing and cleaning up from the major Feb 13th gap wind storm. Taking a closer look, that windstorm was right up there with the big ones measured by pressure gradient between Yakima-Seattle (YKM-SEA), a whopping 13.7 mb!  30 ms = 67 mph (the 2/13 peak gust) Keep us tuned in! We take a high interest level in forecasting the timing and accuracy of these wind events, and are usually first warnin...

Snoqualmie Valley/ central Cascade foothills Thursday PM-Friday AM: Snow potential - models are diverging for the above time period, but this isn't the main event.  The NAM model has a Low making landfall even further south (Lincoln City-Eugene OR swatch) than what was projected in earlier model runs yesterday.  If NAM wins out, we remain bone dry.  If the Low path follows the Euro model projection, we'll see a dusting-2" in the central foothills. Snow level expected near sea level with the cold air so your altitude matters less than during wet snow events.  Snow totals we forecast are smaller than advertised by the media due to the gap winds expected to eat/evaporate some of the falling snow. Winds - models are converging on gap winds from the east to begin Thursday late AM/early PM to reach peak gust potential (~30-40 mph) from 6pm to midnight and remain gusty through the day on Friday. Friday PM-Saturday AM: Bigger snow (and Wind) potential - Friday PM through Sat...

Sunday will certainly feel chillier as colder air had begun to filter in.  The central Cascades, where a Winter Storm Warning is still in effect, may continue see periods of heavy snowfall into the evening hours. Foothills/Snoqualmie Valley: A convergence zone is expected to form, enhancing precipitation potential for a few hours later this evening.  It still looks like there's fairly good southerly flow aloft so it may come in a bit too warm for snow, but the heavier showers are known to at least temporarily bring the snow level down (~500ft). The GFS model is showing a more favorable setup for this. I'd say there's a 50% chance some might see snowflakes by the tail end of the Super Bowl tonight, or later into the evening (after 8-10 pm), potentially lasting into the overnight hours. But that’s the crux of it.  For the last several days we've seen the GFS model persistently call for a fair amount of snowfall in the foothills, tonight and over the coming days, while the...

Why do the snowflakes on the phone app keep appearing then disappearing.. ?  There were three days of snow forecasted yesterday (Snoqualmie) ?!?  Well there's been a real back and forth with the model runs, but what hasn't really changed is that were only getting fringe temperatures, meaning iffy potential for wet snow for the foothills, and a much lower chance for points westward below 500 ft this week. We're looking at rather steady rains Monday.  Showers look to continue into Tuesday and the early morning hours could be rather windy for a short 2-4 hour period if a weak Low develops with ideal placement over B.C.   A couple model runs have the air mass aloft cooling enough to bring a chance of snowflakes below 1,000 ft Tuesday afternoon into early Wednesday.  Something to keep an eye on, but not looking like much of a threat at this point. A brief break in the action looks likely Wednesday afternoon before more rain dives into the forecast for Thurs...

Too warm and too little precipitation seems to be the story for those hoping to see some real snow anytime soon.  With school out Monday in the SVSD it may be an opportune time for a little of the white stuff. Current radar (1/24 3:45pm) - AccuWeather Early Monday temperatures and precipitation chances (very light if any) look to be a near repeat to last night.  We can't rule out a dusting above 500ft, but the chances look low at this point. We're just not seeing the building cold air out of B.C. like we saw with last year's Janmageddon storm that dropped 15-20" of snow around the Snoqualmie Valley in mid-January 2020. @seattlewxguy (on Twitter) snoqualmiewx.blogspot.com/ Tuesday we look to shift out of the pattern of calm northerly flow we've been having for more than a week as a more significant Low develops out in the Pacific, bringing a return of gap winds with gusts likely to peak ~40-50 mph Tuesday evening.  We aren't likely to see much if any precipitati...

CME commodities trading pit, Chicago IL /Associated Press Should we really be relying on one source for our news?  Relating that question to last Wednesday’s wind event, should we be relying on one type of weather model forecast? Far too many in our community were caught by total surprise with Wednesday’s major windstorm that hit the Pacific Northwest. Puget Sound Energy Emergency Coordination Center even called it a Sneak Attack Windstorm.   Damaging southerly winds early Wednesday exceeded 60 mph in many Puget Sound locations, including the Snoqualmie Valley. Top Wind Gusts - Snoqualmie Ridge (2020/21): The problem is we’re too often fed one baseline forecast that is all encompassed by the mucky law of averages with little awareness of the standard deviation of possibilities from the mean.  Unless your confidence interval is extremely high, only forecasting a wind gust range of say 30-35 mph when there are other models (and very good ones at that) saying 60+ mph, c...

Sunday and most of Monday appear to be the relative calm before the storm(s) mid-week.  Should be dry with partly to mostly cloudy skies today.  For Monday, models are mixed as to whether a weak disturbance brings lighter rain back into the forecast, or we may stay mostly dry during the daylight hours. But the real action looks to move in Tuesday and Wednesday.   I’ve lost count on the number of storms centers that tease our state, but drift northeast into B.C.  Close enough to kick up gap winds caused by the Low pulling over Higher pressure east of the Cascades.  Well this looks to be partly the case again Tuesday, though as of now the foothills should be positioned under more of a SE-NW gradient, and much quicker progression.  More characteristic of lower gap wind gusts followed by gusty and rainy widespread conditions across much of Western Wa., not the persistent howling from the east.  Wednesday is where things look a bit different for a change. E...

A very active 24-hours of weather we've had, indeed!  ~3" of rain, near 40 mph wind gusts, followed by wet snow - bringing 1-2" in some of the foothill elevations last night before changing back over to rain this morning.   Credit: Ben Tarkington, 12:30 am Sunday @ 870ft elevation (Snoqualmie Ridge) I feel for the poor souls that were stuck for hours at the pass last night :( NWS has extended a Winter Storm Watch for Snoqualmie pass through most of Monday, still snowing hard at times up there! The Snoqualmie River is running high (~14k cfs) near the falls this morning but is not expected to reach flood stages.  Those levels still make for an excellent stop at the visitors center to witness this awesome force of nature! This next week (3rd-10th) looks to bring more active weather. For Sunday the story should be lingering showers, in the 30's but rising to low-mid 40's by mid afternoon. Overnight we should see easterly winds pick up through the Cascade gaps (~30-40 ...