December 2023 Weather in the PNW

[TigerWoodsLibido]

Buckle up...

[Gradient Keeper]

24 minutes ago, TigerWoodsLibido said:

Buckle up...

[Cold Snap]

Currently a 37 degree rain right now.

[Gradient Keeper]

Temp: 36.3, Dewpoint: 36.0 with light rain and a drift of east wind.

[Gradient Keeper]

Night Shift 6z GFS 5 Day Rainfall totals (ending 10 PM Tuesday)

[Tyler Mode]

Up to 40 now with some actual wind.  Hasn't been above 7 mph in over a week.

[The Blob]

[Ken in Wood Village]

I posted this on the November feed but I see the new December thread. 

Why isn't the NWS issuing a Wind Advisory or a High Wind Warning? If they mention the possibility of 50 mph winds, those could be damaging. 

[TT-SEA]

Fall ended up pretty close to normal in the Seattle area.

Temp departure for the 3 months combined was -0.5 while the overall precip departure was +.28 (12.11 actual vs. normal of 11.83).

[TT-SEA]

Still some wet snowflakes here this morning and 35 degrees and minor accumulation still on the ground from yesterday evening.    The snow falling now is not sticking and the wind is picking up.  

[ShawniganLake]

Snowed about 1/4” here in Penticton overnight.   

[Gradient Keeper]

Radar Update

12/1/23 5:24 am

Heavy rain pounding on my roof woke me up. The first slug of moisture from the onslaught of rain the next 5+ days is here. This is quite impressive!

[Ken in Wood Village]

The NWS issued this not to long ago. I'm surprised they are not issuing a Wind Advisory

Flood Watch

Flood Watch
National Weather Service Portland OR
529 AM PST Fri Dec 1 2023

ORZ001>008-010-012-WAZ020>022-039-040-012130-
/O.NEW.KPQR.FA.A.0002.231201T1329Z-231206T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
North Oregon Coast-Central Oregon Coast-Coast Range of Northwest
Oregon-Central Coast Range of Western Oregon-Lower Columbia-
Greater Portland Metro Area-Central Willamette Valley-South
Willamette Valley-Northern Oregon Cascade Foothills-Cascade
Foothills in Lane County-Willapa Hills-South Washington Coast-I-
5 Corridor in Cowlitz County-Greater Vancouver Area-South
Washington Cascade Foothills-
Including the cities of Stayton, Cannon Beach, Corvallis, Cougar,
Castle Rock, Sweet Home, Tillamook, Yacolt, Vancouver, Cape
Foulweather, Albany, Silver Falls State Park, Yachats, Pacific
City, Salem, Gresham, Ariel, Netarts, Trask, Oregon City, Elk
Mountain, Long Beach, Lincoln City, Astoria, Sunset Summit,
Washougal, Lees Camp, Eugene, Kelso, Woodburn, Willapa, Vernonia,
Lebanon, Ryderwood, Raymond, Jewell, Ridgefield, Toutle, Lake
Merwin, Burnt Woods, Florence, McMinnville, Jasper, Longview,
Vida, Frances, Swisshome, St. Helens, Veneta, Wilsonville, Battle
Ground, Newport, Tidewater, Estacada, Ocean Park, Cottage Grove,
Dallas, Portland, Amboy, Cape Disappointment, Clatskanie,
Hillsboro, Lowell, Troutdale, Sandy, Grande Ronde, Springfield,
Yale Lake, Cathlamet, and Naselle
529 AM PST Fri Dec 1 2023

...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...Portions of northwest Oregon, including the following
  areas, Cascade Foothills in Lane County, Central Coast Range of
  Western Oregon, Central Oregon Coast, Central Willamette Valley,
  Coast Range of Northwest Oregon, Greater Portland Metro Area,
  Lower Columbia, North Oregon Coast, Northern Oregon Cascade
  Foothills and South Willamette Valley and southwest Washington,
  including the following areas, Greater Vancouver Area, I-5
  Corridor in Cowlitz County, South Washington Cascade Foothills,
  South Washington Coast and Willapa Hills.

* WHEN...Through Tuesday afternoon.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Creeks and streams may rise out of their banks. Flooding may occur
  in poor drainage and urban areas.

* ADDITIONAL DETAILS...
  - A series of atmospheric rivers will bring periods of
    widespread heavy rain through early next week. Cascade snow
    accumulations through Saturday morning will experience heavy
    rain Saturday night into Sunday morning which will contribute
    to excessive run off. Total rain amounts for the entire
    weekend range between 3.0-5.0 inches along the coast, 4.5-6.5
    inches over the Willapa Hills and Oregon Coast Range, and 3-4
    inches across the interior lowlands, with 4.0-7.0 inches of
    rain expected over the Cascades, Cascade foothills, and
    western Columbia River Gorge. 2.5-3.5 inches of rain is
    expected for central Columbia River Gorge and Upper Hood
    River Valley. Localized heavy rain will lead to higher rain
    totals.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop. Given the aforementioned
rainfall amounts expected this weekend, river levels will be rising
quickly. Most rivers have anywhere from a 30-50% chance of reaching
at least minor flood stage, except the mainstem Columbia and
Willamette Rivers which is less than 10% chance. Coastal rivers
however have a 40-60% chance of reaching minor flood stage and
20-30% chance for reaching major

[Ken in Wood Village]

Here comes the train of storms!!

[TT-SEA]

Sticking snow again now as heaviest band of precip rolls through... temp just dropped from 35 to 33.  

[Brian_in_Leavenworth]

We're going to get snow here in Leavenworth at least for awhile.  How much?  Certainly difficult to forecast.  Good discussion from Spokane NWS.

".I am not sold on the colder air in the Leavenworth region 
being scrubbed out rapidly tonight. This makes a huge difference in snow totals for Locations such as Leavenworth. The National blend only has 2 inches while the UW-WRF ensembles up to 20" for Leavenworth. Needless to say, confidence is very low for them. The snow ratios would be below 10:1 which would mean very wet and heavy snow for Leavenworth."

 

[Slushy Inch]

Not bad.

[antipex]

24 and snowing this morning - over an inch so far. Nice way to start December after a mild November.

[Rubus Leucodermis]

0.70" storm total, 0.32" since midnight. 37.4˚F.

[MossMan]

.28” so far on the day. 
Currently 35.8 and moderate rain. 

[TT-SEA]

Maybe half an inch here... hard to tell.  Those are our cat's paw prints in the snow as he excitedly rushed outside this morning and then regretted it and came back begging to get inside.  

[MossMan]

My dogs are disappointed that we are not quite in the snow zone. 
Looks lovely up at the passes and Leavenworth though! 

[MR.SNOWMIZER]

Was snowing hard here for a bit but no sticking

 34 degrees 

[Sunriver Slush Zone]

Good morning, and happy December! What a great way to start the month, 4 inches of snow on the ground! We got up to about 1¼ yesterday morning, then it all melted, then all of this fell last night.

[SouthHillFrosty]

The 6z picked up on the snow for Tim…

[umadbro]

[TT-SEA]

13 minutes ago, SouthHillFrosty said:

The 6z picked up on the snow for Tim…

A little too optimistic for Seattle though.  

[SouthHillFrosty]

Ellensburg just had their first snow of the year 

[Rubus Leucodermis]

1 minute ago, SouthHillFrosty said:

Ellensburg just had their first snow of the year 

Sounds a little on the late side for them.

[RentonHill]

[Brian_in_Leavenworth]

45 minutes ago, umadbro said:

 

[DareDuck]

Picked about an inch of snow in SE Bend. Nice to start of December on a positive note. 

[MWG]

I think this is the most typical winter like weather down here. It's so dark out too for this time of the day.

[Anti Marine Layer]

1 hour ago, TT-SEA said:

Maybe half an inch here... hard to tell.  Those are our cat's paw prints in the snow as he excitedly rushed outside this morning and then regretted it and came back begging to get inside.  

Nice for an AR

[fubario]

VERY DARK HERE IN OLYMPIA!

[Ken in Wood Village]

Some lightning strikes

[LowerGarfield]

Had just barely measurable .10 of snow overnight. No rain or snow currently but was on the low end for my area. Should be getting rain later.

[AlTahoe]

1 hour ago, SouthHillFrosty said:

Ellensburg just had their first snow of the year 

Still none here. Looks like mid Dec might be our first shot. This will be our latest first snow since Dec 1995. Very un El Nino like. 

[LowerGarfield]

Light snow falling now. Temps are rising so doubting I'll get any new stickage other than what fell last night which is still there.

[Phil]

https://x.com/climatologist49/status/1730636594565312946?s=46&t=656Z973wLtGKaIyhhq_7QQ