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December 2024


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After the briefly cooler start to December, the models are shifting back to warmer winter pattern which has been in place since 15-16. We can see the familiar Aleutian Ridge and -PNA trough in the West. This leads to a warmer Southeast Ridge pattern for us by mid to late December.


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IMG_2164.png.37517be72784c17bf8eda1ef0a6749a0.png

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10 minutes ago, bluewave said:

After the briefly cooler start to December, the models are shifting back to warmer winter pattern which has been in place since 15-16. We can see the familiar Aleutian Ridge and -PNA trough in the West. This leads to a warmer Southeast Ridge pattern for us by mid to late December.


IMG_2165.thumb.png.bd63420e7989e7e0cc7e51754bdb6497.png

 
IMG_2163.thumb.png.bfd72a1250151f9d0709d0e3313724a2.png

IMG_2164.png.37517be72784c17bf8eda1ef0a6749a0.png

Chris, IF the last few CFS ensemble runs were to verify pretty well, we’d be looking at a strong  +AAM (El Ninoish) late in Dec and early in Jan. If so, any mid Dec SE ridge dominance could be shortlived:

IMG_0916.thumb.png.295d73749fd196a11cbc33e510b2ea40.png

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15 minutes ago, MJO812 said:

Never doubt the MJO

It's traveling through the warm phases. Earlier predictions had it going into the COD .

 

 

Edit: Never doubt the warmth. If the models show average, add +1-+2, if they show warmth add +3-+5. If they show frigid, moderate towards just below normal. We have seen this time and time again. The patterns of sustaining cold are over on a planet with more and more thermal energy.

 

As I tell my ecology classes, all you have to do is look around. Literally look around at all of our energy use. Hardly any of it was around 100 years ago, to think this wouldn’t have an effect is pure stupidity. 

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1 minute ago, GaWx said:

Chris, IF the last few CFS ensemble runs were to verify pretty well, we’d be looking at a strong  +AAM (El Ninoish) late in Dec and early in Jan. If so, any mid Dec SE ridge dominance could be shortlived:

IMG_0916.thumb.png.295d73749fd196a11cbc33e510b2ea40.png

Do you have the EPS and GEFS AAM forecasts? The CFS hasn’t been very reliable. If we could indeed see another +AAM influenced interval then maybe we can see alternating patterns this winter at times. 

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8 minutes ago, bluewave said:

Do you have the EPS and GEFS AAM forecasts? The CFS hasn’t been very reliable. If we could indeed see another +AAM influenced interval then maybe we can see alternating patterns this winter at times. 

 No I don’t and yes I don’t trust the unreliable CFS. After all it still has an unrealistic record cooling from Nov to Dec in Nino 3.4 that no other model had in Nov. However, even though it could turn on a dime, I’d still rather the CFS show this persistent strong +AAM than show a -AAM. So, we’ll see if it happens to be “onto” something as opposed to “on” something.

 I did notice that the last 3 runs of the extended GEFS break down the SE ridge late month *fwiw* suggesting it may dominate for no more than 1-2 weeks.

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2 minutes ago, GaWx said:

 No I don’t and yes I don’t trust the unreliable CFS. After all it still has an unrealistic record cooling from Nov to Dec in Nino 3.4 that no other model had in Nov. However, even though it could turn on a dime, I’d still rather the CFS show this persistent strong +AAM than show a -AAM. So, we’ll see if it happens to be “onto” something as opposed to “on” something.

All we know is that we were able to get a brief +AAM influenced period between the record warmth this fall and warmer pattern beginning to emerge next week. So maybe we can get a few more of these going forward after December. Our next modeling clue may have to wait until later December into early January. 

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Human psychology is a helluva thing lol.  Singular model runs sometimes over-detect trends and then sometimes over-correct.  The cold will almost definitely relax for the second half of the month, but it’s a good sign that we are seeing some this early.

Also FWIW, I like the PAC look much more than I have for the past two winters.  I think the 13-14 comparison is probably overstated, but unlike the past few years, I think we might get a few periods this winter where the EPO cooperates.

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3 hours ago, MJO812 said:

The long lasting cold pattern is now gone. 

Here comes the typical Christmas thaw.

 

2 hours ago, JustinRP37 said:

Edit: Never doubt the warmth. If the models show average, add +1-+2, if they show warmth add +3-+5. If they show frigid, moderate towards just below normal. We have seen this time and time again. The patterns of sustaining cold are over on a planet with more and more thermal energy.

 

As I tell my ecology classes, all you have to do is look around. Literally look around at all of our energy use. Hardly any of it was around 100 years ago, to think this wouldn’t have an effect is pure stupidity. 

 

2 hours ago, MJO812 said:

Quite a big change from last week. Onto January .

The only constant is change. You know you dive in too deep each and every year, as many do, right? It'll change again, only because it always does. 

Other nice point made here is the ecology point. It's chemistry. +1. 

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18 minutes ago, eduggs said:

We'll see how Wed night goes. And obviously the month just started. But I can see a way that December ends up less snowy than November for a lot of the NW suburbs. Long range modeling suddenly looks shockingly bad for snow.

The low and all the associated good forcing and lifting is going to be well north of here Wed night. We’re going to be lucky to get more than a dusting/coating out of that and looking at the soundings, there may be virga issues

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13 hours ago, winterwx21 said:

A cold first half of December has turned into just a cold first week of December. Next week looks fairly mild now. We do still have hope of seeing flakes Wednesday night. 0z Euro actually gives us a decent little burst of snow, but it will be tough to accumulate near the coast with temps above freezing. It's pretty much all we have right now, so we root to see a little something Wednesday night. 

Similar to last year where we ended up with a couple of 7-8 day periods of cold.  This one is going to end up dry unfortunately.

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