December 2020 Weather Observations for the PNW

[TT-SEA]

Setting sun against the Cascades...

 

[Dave]

4 hours ago, Omegaraptor said:

Euro is a good run if you want Central Valley temperatures in the Willamette Valley and 6500’+ snow levels.

I can't stand it when the Central Valley runs out of temperatures.

 

 

[Gradient Keeper]

4 minutes ago, MossMan said:

Hey! That’s Brennan’s illegal cabin in the woods on your cover!! 

Yes it is!

[Timmy Supercell]

Flurrying out there right now. Didn't think the snow would start until tomorrow. I haven't been looking at AFD's lately so what do I know.

[Deweydog]

12 minutes ago, TT-SEA said:

Setting sun against the Cascades...

 

Definitely has a pre/post Arctic blast look to it!

[Gradient Keeper]

17 minutes ago, TT-SEA said:

Setting sun against the Cascades...

What a ****ty view you have. Just abysmal.

[Gradient Keeper]

We have about 14 days for models to get their act together. That's more than enough time for a blocking/cold pattern to develop. I believe it certainly can.

00z CMCE (Pivotal) in 5 hours 53 minutes

[Tyler Mode]

The sun sets 2 seconds later tonight...hello spring!

Oh ya, it's 41 and raining. 

[weatherwonder]

8 minutes ago, DJ Droppin said:

We have about 14 days for models to get their act together. That's more than enough time for a blocking/cold pattern to develop. I believe it certainly can.

00z CMCE (Pivotal) in 5 hours 53 minutes

This!

[Jesse]

13 minutes ago, Tyler Mode said:

The sun sets 2 seconds later tonight...hello spring!

Oh ya, it's 41 and raining. 

Did you celebrate the beginning of fall when we lost our first few seconds of morning daylight in early June this year?  

[umadbro]

Looks like snow was falling as low as 1200' in western Oregon.

[Jesse]

18z GFS is a beautiful La Niña run.

[El_Nina]

38 and rain here, 0.19" so far. 

[TheNewCulverJosh]

31.1 here with very heavy virga.

[Tyler Mode]

Today is my coldest day of the month with a mean of 38.1.  Snow is falling as low as 1,600' east of Battle Ground from reports I've seen.

[TacomaWaWx]

43/38 today. 

[paulb/eugene]

Isn’t this the lowest 500mb height ever over Puget Sound?

this is March 5 1951.   Looks like 504 over Seattle, 498 Bellingham 

[TheNewCulverJosh]

9 minutes ago, paulb/eugene said:

Isn’t this the lowest 500mb height ever over Puget Sound?

this is March 5 1951.   Looks like 504 over Seattle, 498 Bellingham 

How did they generate that?  With a computer the size of a 2 bedroom apartment?

[Deweydog]

15 minutes ago, paulb/eugene said:

Isn’t this the lowest 500mb height ever over Puget Sound?

this is March 5 1951.   Looks like 504 over Seattle, 498 Bellingham 

Reminds me of a couple of the GFS runs five days out in early January 2005...

[FroYoBro]

Had a 42/36 day. Not bad!

[Meatyorologist]

I have a feeling that we'll start seeing some better runs as New Years and beyond come into view, plus or minus a few days. Maybe the 00z will start that? It initializes soon, so we'll know in a couple hours.

[FroYoBro]

2 minutes ago, Meatyorologist said:

I have a feeling that we'll start seeing some better runs as New Years and beyond come into view, plus or minus a few days. Maybe the 00z will start that? It initializes soon, so we'll know in a couple hours.

The first good run for the lowlands will be on Christmas. Santa is a good guy. This place is going to be so joyful that day! 

[Gradient Keeper]

2 hours ago, paulb/eugene said:

Isn’t this the lowest 500mb height ever over Puget Sound?

this is March 5 1951.   Looks like 504 over Seattle, 498 Bellingham 

That's mind boggling and then add on it was March 5th! Incredible.

[umadbro]

2 hours ago, Deweydog said:

Reminds me of a couple of the GFS runs five days out in early January 2005...

Reminds me of the GFS runs the last two winters since the "upgrade".

[Meatyorologist]

3 minutes ago, DJ Droppin said:

That's mind boggling and then add on it wa March 5th! Incredible.

It actually makes sense that it occurred so "late" in the season. Since 500mb GPH is a factor of mostly the 950-500mb region, it is largely dependent on those temperatures. And guess when those temperatures bottom out? That's right, around late winter/early spring, since vertical temperature transfer is so delayed. And keep in mind that the high arctic is still cooling because they don't get sunlight until at least March 20th.

[Gradient Keeper]

00z GFS Day 1

[Deweydog]

Just now, DJ Droppin said:

00z GFS Day 1

If this was at 336 hours we’d be excited about it.

[Blizzard777]

Enjoyed the trip home under that rain band this evening. Temp was pretty constant coming home... 41*.  The positive splats on windshield continued down into Portland.  Precipitation was pretty heavy at the time. 
43/36 here today and the last of that band pushing through.  On the lighter side up here...no splats  

[SilverFallsAndrew]

First snow of the year! Melting quick but at least a little left. Was down south picking up a new family member. 

[Gradient Keeper]

Day 2

[Meatyorologist]

1 minute ago, SilverFallsAndrew said:

First snow of the year! Melting quick but at least a little left. Was down south picking up a new family member. 

Oh wow I thought you were kidding earlier. Good stuff!

[Deweydog]

4 minutes ago, SilverFallsAndrew said:

First snow of the year! Melting quick but at least a little left. Was down south picking up a new family member. 

My wife and I picked out our first puppy together (Dewey) in December 2003.  A couple weeks later...

[Gradient Keeper]

Day 3

[Gradient Keeper]

Day 4

[Gradient Keeper]

Energy/trough further west in the Bering Sea.

[Gradient Keeper]

Day 5

[Gradient Keeper]

1 minute ago, DJ Droppin said:

Day 5

(Past 4 runs)

[Timmy Supercell]

44/11 at KLMT. The hour or so of flakes dodged the airport somehow but it doesn't surprise me.

Clearing on radar now, should be some more activity in about 12 hours.

Just checked out Euro, shares a little more snow on the east slopes with 5.0" here. 5-day total.

10-day totals give more to the cascades.

 

[Gradient Keeper]

Day 6

[Gradient Keeper]

Just now, DJ Droppin said:

Day 6

(Past 4 runs)