December 2015 in the Pacific Northwest

[Gradient Keeper]

Reports of sleet in Vernonia...

[FroYoBro]

34.7, DP 30.2 here, btw.

 

Pretty decent numbers. I am about a degree warmer than you down here. Thinking the rain should turn into some wet snow even down here. Probably won't stick. 

[Jesse]

Column's warmer now.

They just reminded me that the sky is still capable of producing snow in the I-5 corridor.

[Kayla]

Latest HRRR says by 10am all areas in PDX west metro will see accumulating snow.

[seattleweatherguy]

Hmmm we will see which model is right

[luvssnow_spokane]

Looking forward to today's rain ... Finally something different!! Yipppeeee!!

[Jesse]

Pretty decent numbers. I am about a degree warmer than you down here. Thinking the rain should turn into some wet snow even down here. Probably won't stick.

What is your elevation?

[luvssnow_spokane]

Looking like rain for most today... Just checked WSDOT cams and is all rain so far up here. Just to warm it appears

[luvssnow_spokane]

Currently 38.2 with a dp of 34 at my elevation of 550'... I think I will invest my time in playing Clash of Clans today at least there is snow falling in there. And no, this is not pathetic!!

[Deweydog]

Looking forward to today's rain ... Finally something different!! Yipppeeee!!

Good point!

[Jesse]

Latest HRRR says by 10am all areas in PDX west metro will see accumulating snow.

Nice!

[luvssnow_spokane]

Good point!

[seattleweatherguy]

37 with a dp of 29 hopefully snow happens

[Gradient Keeper]

Mesoanalysis

Upper air Analysis (over PDX)

As of 8 AM: 850mb temps have cooled down to -1.5c, 925mb slightly cooler +1.5c

[TT-SEA]

37 with a dp of 29 hopefully snow happens

 

 

So you are hoping for snow?   Thanks for the update... very good information.   I also like snow and hope it happens.

[SilverFallsAndrew]

31 under a high broken overcast here. Those echoes are moving east very slowly.

[snow maniac]

Light rain here now.

Slushy rain now.

[FroYoBro]

What is your elevation?

 

Right around 250. 

[Timmy]

Interesting some models (rpm) showing 1-2" for me while the wrf is sticking to its guns for about 6-8". Quite a discrepancy.

[Gradient Keeper]

Latest run of the HRRR shows a snowstorm for PDX! Here are the snowfall accumulations through 3 pm this afternoon! SCORE!!!   

 

http://maps2.pivotalweather.com/models/hrrr/20151227/1500Z/f008/acc10_1snownw.png

Well that would be awesome. I certainly don't expect this to be right, but let's see how much wet bulb cooling we get. East wind has increased gusty at times where I'm at. PDX-DLS increased to -5.1mb as of 8 AM. Keep those dewpoints low.

[Jesse]

Right around 250. 

 

I wouldn't completely rule out sticking snow.

[Deweydog]

Well that would be awesome. I certainly don't expect this to be right, but let's see how much wet bulb cooling we get. East wind has increased gusty at times where I'm at. PDX-DLS increased to -5.1mb as of 8 AM. Keep those dewpoints low.

I think east wind spots are going to struggle with this.

[SilverFallsAndrew]

Interesting some models (rpm) showing 1-2" for me while the wrf is sticking to its guns for about 6-8". Quite a discrepancy.

 

Are you getting any precip yet?

[Gradient Keeper]

I think east wind spots are going to struggle with this.

I tend to think you're right.

[Timmy]

Are you getting any precip yet?

Just light echoes and flurrys

[MossMan]

Well my current temp is 37 degrees with a dp of 26. So temp has risen and dp has continued to fall. Need some good precip intensity to get some good snow...not sure how this is going to go.

[Kayla]

Precip band is really slowing/stalling west of Hillsboro. Temp has risen to 33º here, dp 29º.

 

12z Soundings don't look all that great...HRRR is now showing widespread 1-3" for PDX metro area but not sure if we have enough cold air to support that.

[stuffradio]

The Weather Network gives me pure sun balls from the 29th to the 10th with highs of 41 F and lows ranging from 30 to 18F. I think that's a pattern Jesse would like?

[Perturbed Member]

The wet bulb temps at the surface at the moment aren't too impressive for those of us on the valley floor. Hopefully there is some drier air aloft that will cool a bit more after the precip hits and help cool the lower levels too under steady precip.

 

Temp:35F DP: 33F here.

[ShawniganLake]

32F and snowing here.  Not a lot to show for it, just enough to make everything white.  Spent most of the night with a slushy mix falling, with temps between 32-33F, approx. 1/3" of liquid.  Looks like SE flow wedged a little warm air in here between the surface and the 925mb level, as they both looked like they should have supported snowfall.  The Malahat station, 1200ft and 10 miles from here, was bouncing around between 34-36F.  Frustrating night!

[TT-SEA]

12Z GFS shows classic Nino pattern for next week... and the rain train down in CA!

 

http://mag.ncep.noaa.gov/data/gfs/12/gfs_namer_240_precip_p03.gif

[Deweydog]

12Z GFS shows classic Nino pattern for next week... and the rain train down in CA!

 

http://mag.ncep.noaa.gov/data/gfs/12/gfs_namer_240_precip_p035W%20.gif

Mountain wave?

[TT-SEA]

Seeing some blue sky here.. 34 now with a dewpoint of 27.

 

Not expecting snow here today now.    

[MossMan]

Sure looks like a pretty good slug of moisture moving in...hmmmm.

[snow maniac]

Slushy rain now.

Check... it's all snow now

[Timmy]

Mark's RPM model (12z) shows no snow at all for anyone in the pnw in the next 3 days. must be broken. light snow just started here. temp down .5 degree to 32.1

[Timmy]

it's beautiful, dry snow too.

[TT-SEA]

11th consecutive day with snow on the ground here... better than last year. 

[TT-SEA]

it's beautiful, dry snow too.

 

 

Nice!  

[Perturbed Member]

Mark's RPM model (12z) shows no snow at all for anyone in the pnw in the next 3 days. must be broken. light snow just started here. temp down .5 degree.

I've almost always found the RPM to be trash. It claimed a few inches of snow for PDX Christmas or Christmas eve too. I've found the RPM snow map to be unreliable on many occasions.