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Wintry Winter 25-26 Winter Battle Zone

Is that from snowbird bob?

Hey Kevin,
This is a control run (18Z of yesterday) of the WxBell CFS being forecasted out 2 months. Even calling this map less than worthless is being kind.

So for Jan, here’s a repost of that 18Z of 11/1 CFS control run:
IMG_5102.png

Keep in mind that these are in C, not F. So, it gives the majority of the middle 1/3 of the US a record obliterating cold Jan.

To show how silly this run is, it has Chicago at an obliterating alltime record breaking cold Jan of 14C/25F BN, which is -1F! The coldest Jan (and any month for that matter) on record back to 1873 is +10.1F (1977). So, this CFS control run is forecasting Chicago to have a Jan that is 11F colder than any month they’ve had during the last 153 years!

Now here’s the very next CFS control run, the 0Z 11/2 run:
IMG_5101.png

Instead of mid-America having a record obliterating cold Jan, it has much warmer than normal in much of the same area! It has Chicago only 3 F AN because the WxBell CFS maps always show a funky cold spot centered on Lake Michigan (funky WxBell CFS algos is another issue for another time that I’ve posted about before). So, it has Chicago at an AN +27F vs -1F on the prior run or 28F warmer lmao!
 
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Feel like recent ninos have had to much jet extension issues so even a moderate Nino feels like a super, can can never establish a true bridge to Arctic air into the NA during any ninos recently and we get setups that are barely to warm to snow, meanwhile a Nina almost always results in a ridge around Alaska/the Aleutians and brings cold nearby at least, it’s more so we fight the jet being to retracted especially later in winter
 
Feel like recent ninos have had to much jet extension issues so even a moderate Nino feels like a super, can can never establish a true bridge to Arctic air into the NA during any ninos recently and we get setups that are barely to warm to snow, meanwhile a Nina almost always results in a ridge around Alaska/the Aleutians and brings cold nearby at least, it’s more so we fight the jet being to retracted especially later in winter

I thought I read somewhere that weak Nina’s were actually better historically for snow averages for CLT than ninos on average. Maybe that the reason why, ninos just have too much jet although the storm track is further south.
 
I thought I read somewhere that weak Nina’s were actually better historically for snow averages for CLT than ninos on average. Maybe that the reason why, ninos just have too much jet although the storm track is further south.

Now that I think about it I believe our biggest snowstorm ever in February 2011 and February 2021 were both in La Nina 🤣

I know the last real El Nino I remember we got flooded with Pacific air all winter and it sucked. That was one of the winters with a snow hole here since 21 and all we managed was like an inch the whole winter which is sad for here
 
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Now that I think about it I believe our biggest snowstorm ever in February 2011 and February 2021 were both in La Nina 🤣

I know the last real El Nino I remember we got flooded with Pacific air all winter and it sucked. That was one of the winters with a snow hole here since 21 and all we managed was like an inch the whole winter which is sad for here
Yeah u r correct Brent … last few El Niño events we had have really sucked …. Take chance with a weak Nina for sure
 
This winter looks like it's going to fall in line with what you'd typically expect hemispherically during a cool ENSO/east QBO/solar max December with lots of high-latitude blocking & a weakened NAM/ -AO & -NAO.

Given how early on in the winter the vortex is weakening here and that we have a pretty favorable look for -EPO/+TNH to dominate especially in January-February, I do think we will probably flip the AO/NAO to positive (& possibly strongly so) at some point way down the road, probably in January if I had to guess. That won't necessarily mean an end to winter or snow/ice threats the moment that happens, but the overall flavor any potential systems or windows of opportunity would certainly change from where it looks to be in December.


East QBO High Solar -ENSO NHEM SLPa Dec.png


ecmwf-weeklies-avg-nhemi-mslp_anom_30day-6102400.png
 
This winter looks like it's going to fall in line with what you'd typically expect hemispherically during a cool ENSO/east QBO/solar max December with lots of high-latitude blocking & a weakened NAM/ -AO & -NAO.

Given how early on in the winter the vortex is weakening here and that we have a pretty favorable look for -EPO/+TNH to dominate especially in January-February, I do think we will probably flip the AO/NAO to positive (& possibly strongly so) at some point way down the road, probably in January if I had to guess. That won't necessarily mean an end to winter or snow/ice threats the moment that happens, but the overall flavor any potential systems or windows of opportunity would certainly change from where it looks to be in December.


View attachment 175986


View attachment 175987
So in this type of scenario do we have a better shot at winter weather in December than both Jan and Feb? Or maybe the things look better in Feb than Jan? I’m used to us putting all our eggs into the Jan basket and giving up on Feb. And December for that matter lol
 
So in this type of scenario do we have a better shot at winter weather in December than both Jan and Feb? Or maybe the things look better in Feb than Jan? I’m used to us putting all our eggs into the Jan basket and giving up on Feb. And December for that matter lol

Imho, tho we've had some good stretches here and there, I would say that December as a whole this year is probably about as favorable as it has looked at this range in a very long time.

January could be intriguing and I wouldn't be shocked if there are at least occasional favorable opportunities intermixed with stretches of SE ridging.

Imho, our best (& possibly only) shot to come away with a good February this winter is if the eastern edge of the Indo-Pacific Warm Pool advances more quickly than expected, which would invigorate convective heating closer to the Central Pacific & possibly help dislodge the Aleutian-Gulf of Alaska ridge eastward/closer to the US West Coast. This is something we've occasionally seen play out in heavy +TNH/-EPO winters like 2013-14 & 2014-15.
 
This winter looks like it's going to fall in line with what you'd typically expect hemispherically during a cool ENSO/east QBO/solar max December with lots of high-latitude blocking & a weakened NAM/ -AO & -NAO.

Given how early on in the winter the vortex is weakening here and that we have a pretty favorable look for -EPO/+TNH to dominate especially in January-February, I do think we will probably flip the AO/NAO to positive (& possibly strongly so) at some point way down the road, probably in January if I had to guess. That won't necessarily mean an end to winter or snow/ice threats the moment that happens, but the overall flavor any potential systems or windows of opportunity would certainly change from where it looks to be in December.


View attachment 175986

Here's what I've got for those years in December at 500mb (left) and 850mb temperatures, set against 1900-2015

Nov 3 Composite.png
 
Trend could reverse, but last 3 Euro Wk runs show a weakening trend with the Strat PV at 10mb. Fits well with forecasts of developing Greenland blocking

View attachment 175976

The mean gets down to a mere +10, which compares to +14 to +15 on the prior run and +18 on several runs before that! I estimate 35-40 % of members with a very early season major SSW (10 mb wind reversal), by far the highest yet!

The last times late Nov/early Dec was this weak was 2009-10, 2000-1, and 1996-7 with 2016-7 almost as weak.

The last time there was an actual major SSW (reversal) in late Nov or early Dec was way back on 12/7/1987! The last time there was one at any point in Nov or Dec was on 12/29/2001. Before that there was 12/16/1998, the aforementioned 12/7/1987, the legendary 12/31/1984, 12/3/1981, 11/24/1968, 12/7/1965, and 11/30/1958.

So, it having been a whopping 24 years since the last Nov or Dec major SSW meaning we’re extremely overdue. Prior to the current 24 year drought, the longest on record between early season majors was 13 years followed by 11 years. The current average return period is 8 years.

Regarding these 8 early major SSWs, how many were after allowing for a lag period followed by a notable long cold period in a good portion of the E US?

-12/29/2001: no notable cold

-12/16/1998: cold 1-3 weeks later

-12/7/1987: cold 3-6 weeks later including intense cold 4-5 weeks later

-12/31/1984: cold 2-6 weeks later including extreme cold 3 weeks later

-12/3/1981: cold 1-7 weeks later including extreme cold 5 weeks later

-11/24/1968: cold 2-7 weeks later

-12/7/1965: cold 5-9 weeks later including extreme cold 7 weeks later

-11/30/1958: cold 1-6 weeks later

So, 7 of the 8 early season major SSWs were followed by cold domination starting mainly 1-3 weeks later and lasting for 2-6 weeks with a one week period of intense cold in 1/2 the cases.
 
The mean gets down to a mere +10, which compares to +14 to +15 on the prior run and +18 on several runs before that! I estimate 35-40 % of members with a very early season major SSW (10 mb wind reversal), by far the highest yet!

The last times late Nov/early Dec was this weak was 2009-10, 2000-1, and 1996-7 with 2016-7 almost as weak.

The last time there was an actual major SSW (reversal) in late Nov or early Dec was way back on 12/7/1987! The last time there was one at any point in Nov or Dec was on 12/29/2001. Before that there was 12/16/1998, the aforementioned 12/7/1987, the legendary 12/31/1984, 12/3/1981, 11/24/1968, 12/7/1965, and 11/30/1958.

So, it having been a whopping 24 years since the last Nov or Dec major SSW meaning we’re extremely overdue. Prior to the current 24 year drought, the longest on record between early season majors was 13 years followed by 11 years. The current average return period is 8 years.

Regarding these 8 early major SSWs, how many were after allowing for a lag period followed by a notable long cold period in a good portion of the E US?

-12/29/2001: no notable cold

-12/16/1998: cold 1-3 weeks later

-12/7/1987: cold 3-6 weeks later including intense cold 4-5 weeks later

-12/31/1984: cold 2-6 weeks later including extreme cold 3 weeks later

-12/3/1981: cold 1-7 weeks later including extreme cold 5 weeks later

-11/24/1968: cold 2-7 weeks later

-12/7/1965: cold 5-9 weeks later including extreme cold 7 weeks later

-11/30/1958: cold 1-6 weeks later

So, 7 of the 8 early season major SSWs were followed by cold domination starting mainly 1-3 weeks later and lasting for 2-6 weeks with a one week period of intense cold in 1/2 the cases.
A good question would be how did the rest of those winters go on to perform?
 
A good question would be how did the rest of those winters go on to perform?

Outside of 1998, we had some good to even really good stretches those winters.

Even after no real cold in Dec 2001, we found a way to crank out a big dog w/ Jan 2-3 2002 producing 12"+ in RDU.

Also had the big early Jan 1988 event following the early Dec 1987 SSWE, epic cold snap in Jan 1985 (nearly -10F at RDU), huge snow event (12-18") in the mountains and foothills in 1981 with "snow jam" in Jan 1982. 1968-69 had a pair of historic big dogs in Feb 1969 (especially the mid Feb 1969 storm). 1965-66 went berserk in Jan 1966, Dec 1958 had a giant snow event in early December w/ 18" in Smithfield & still is the last 1 foot+ snow event in Fayetteville.
 
Outside of 1998, we had some good to even really good stretches those winters.

Even after no real cold in Dec 2001, we found a way to crank out a big dog w/ Jan 2-3 2002 producing 12"+ in RDU.

Also had the big early Jan 1988 event following the early Dec 1987 SSWE, epic cold snap in Jan 1985 (nearly -10F at RDU), huge snow event (12-18") in the mountains and foothills in 1981 with "snow jam" in Jan 1982. 1968-69 had a pair of historic big dogs in Feb 1969 (especially the mid Feb 1969 storm). 1965-66 went berserk in Jan 1966, Dec 1958 had a giant snow event in early December w/ 18" in Smithfield & still is the last 1 foot+ snow event in Fayetteville.
Thank you! My expectation is for a cold snap at some point after a SSW. Given the strong correlation there with the early events mentioned, it made me wonder how the rest of those winter turned out. It's good to see there were somw bangers in there.
 
Outside of 1998, we had some good to even really good stretches those winters.

Even after no real cold in Dec 2001, we found a way to crank out a big dog w/ Jan 2-3 2002 producing 12"+ in RDU.

Also had the big early Jan 1988 event following the early Dec 1987 SSWE, epic cold snap in Jan 1985 (nearly -10F at RDU), huge snow event (12-18") in the mountains and foothills in 1981 with "snow jam" in Jan 1982. 1968-69 had a pair of historic big dogs in Feb 1969 (especially the mid Feb 1969 storm). 1965-66 went berserk in Jan 1966, Dec 1958 had a giant snow event in early December w/ 18" in Smithfield & still is the last 1 foot+ snow event in Fayetteville.

Not to be left out, late Dec-early Jan 1998-9 actually did have a 2 week wintry stretch of notable cold that started a week after the SSWE along with several wintry precip events that included a major icestorm on Christmas Eve in much of the South, including Greensboro/Raleigh/Charlotte:



@Rain Cold

Then a second icestorm occurred Jan 2-3, 1999!

 
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Thank you! My expectation is for a cold snap at some point after a SSW. Given the strong correlation there with the early events mentioned, it made me wonder how the rest of those winter turned out. It's good to see there were somw bangers in there.
I feel like things really got shook up last year in a good way. Idk how to explain it but it seems like it was a turning point of sorts. Could be wrong but I think we are gonna see some really good winters coming up. Plus, we are just due. It’s gotta switch back in our favor eventually. Now’s a good time.
 
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