raindancewx

This event really isn't in the same echelon as the top El Ninos by the traditional SST measures. -PDO really sticks out v. 2015-16 too. That will matter again in JanuaryFebtuary, after being irrelevant in December.

CFS basically has the same look for December carrying into January. I've been pleased with the pattern so far, it's nice and wet. The mountains here are getting a ton of snow. The resorts have 2-4 foot bases at the moment. We've had back-back wetter than average months for the first time since Jan-Apr 2019. The CFS basically has no skill until a day-two days before the new month starts. It's actually remarkable how little El Nino changes with time. Some of the El Ninos in the 1940s were absolutely brutally cold in Russia like this year, and very warm in the US like this year has been to date. Close to a literal recreation of the conditions that helped kill so many Nazis.

I agree that January will be warm. But I think it's best to focus on the years in your list that had a huge disparity in Dec temps for Russia v. Canada as the roll forward criteria.

I've been studying this purple Russia, v. red Canada thing. It's pretty interesting if you roll forward the results in an El Nino. A lot of El Ninos have either the red or the purple in the right place, but not both. 1965 and 2002 are not horrible matches, but 1997 is a lot closer. Jan-Mar 1998 looks pretty close to what I expected in my analogs for the winter. It's not a particularly cold period, but everyone would have their shots at major storms if you look at the months individually.

If this verifies, it's pretty hard for me to see any area of the northern US verifying cold, or even near average for Dec-Feb. Well...Alaska.

I'm seeing people get a bit excited about early January. The colder pattern for the East that we saw in parts of November should cycle through in January. But it's not going to be as early as week one. The simplest issue is this low south of Kamchatka yesterday. That should be between 32-37N, about 105-108W in the time frame of Jan 3-7 using the Bering Sea Rule. Lows that deep tend to force tremendous warmth out ahead of them to the East. It may only be for 1-3 days, but that's a large portion of a week. But these systems are often followed by pattern changes. More generally, the entire GFS run has the Low north of High low in East Asia look (+WPO). It's difficult to get the Eastern US real cold with that in place. The look below is essentially a giant high over Texas and a giant low over CO or NM pumping up massive heat from the South/MX/TX in between them, and then the whole thing translates East. I have composites of what East Asia looks like ahead of the greatest snow events in NM/CO for the past 50 years or so.

I'm pretty excited. Going to see back to back wetter than average months locally for the first time since Jan-Apr 2019. 4.5 years+ - what an abomination for consistent moisture. As far as wildcards for the rest of the winter: Anyone have a read on the volcanic output for the eruption in Iceland? I've always assumed some of the weirdness with the persistent blocking around 2009-10, 2010-11 was tied to the high latitude eruptions up there. https://en.wikipedia.org/wiki/2010_eruptions_of_Eyjafjallajökull The good news for December is that the temperature correlation nationally looks much less like the -PDO. That's not surprising, the PDO correlation to US temps is weakest in December and March. It's the pretty classic "record Nino 4 warmth" look. It's a correlation of course, so it always comes in a different flavor. I certainly had the US colder than it's been in December, but the relative pattern of hottest v. coldest locals are at least right on my end. We should see more cold expansion in the West with the next wave of wet systems over the next week anyway.

1/6 done with Dec-Feb, and two thirds of the US is +3 to +12. Nothing like 2009 despite months and months of similar forcing maps on here. At a hemispheric level, Alaska has been fairly cold, while nearly all of Canada is running +7 or more above average. Mexico has been fairly cold in the Central Highlands. I mentioned in my outlook that they might have a pretty cold winter down there. Still not expecting any part of the US to finish more than 1F below average for winter, as I had in my outlook. I had the +/-0F line about half way through the yellow area below in both the SW & SE US.

Precipitation pattern globally in November looks a bit like the MJO 5-6, but really more 6 or 6-7. My view of the MJO is the dominant feature sets up in the middle of the warmest band of the ocean. The waters are not an indicator of the transversal. Just where the heat is in aggregate. Phase 8 is pretty tied to precipitation patterns in Brazil - so the opposite phase v. the eight on the map is a good indication it was more 6. MJO isn't really the pattern driver anyway. To me it's like a dog on a leash. Everything else is the dog's human. The human has the dog on a leash, but at any given moment the dog can be left, right, ahead or behind the human. I had mentioned in my October Winter outlook that a blend of 1951, 2004, 2006 precipitation patterns in the Pacific looked a lot like the winter depiction on the Canadian. That held up fairly well in November, which is a good sign for the tropical precipitation verifying in phase 6-7 overall.

The special characteristic of 1973 from my research is the recurring volatility of two long lived patterns during short periods. I'm just saying...you'd have more chances than you think. The variation is so fast and dynamic the monthly indexes are almost irrelevant by month. You can see a pretty clear 45 day-cycle of cold reaching the east in that pattern. Early January, late February, early April. You can also see a 45-day tendency for super heat in the East as well- late January, early March, late April. AO was overall positive in Jan-Mar 1973...but you know...still pretty damn cold at times. Apr 16-30 was also very warm in the East, per the pattern.

1973 with a warmer Atlantic would probably be a 2-3 month window of very powerful, wet storms, with marginal cold for a lot of the Eastern US. You'd force a lot of the fluke super cold/strong storms to the north with southern heat already building up from the south. Atlantic was frigid in the early 1970s. 1972-73 is the snowiest winter/cold season on record in a lot of interior West. I don't expect that this year, but it's a pretty special winter for a lot of the country, including the southern US.

Every forecast I've seen for this month, including my own, looks way too cold now. We're talking about +10-15 anomalies already guys. I wasn't fucking around in late November when I said the heat would be similar in magnitude to Dec 2015. I never meant that it was going to sit exclusively over DC to Boston as you all took it. The northern third of the US is averaging +5 or something, and we're losing the "cold" aspect of early Dec with the AO/NAO flip. The WPO still looks super positive, i.e. "low north / high south" oriented for the coming weeks, so lows should continue to dump into Los Angeles. The CFS is garbage, but it does this coming the next week. Its hard to imagine it completely screwing up something that close to now. You're talking a pretty substantial expansion of +5 to +15 type warmth in the northern US if it's remotely close. In week two, when it has no skill, the +5 to +15 zone moves east. Just a quick reminder - this is how Dec 2009 looked. That's why I've been so cranky about that year. I don't have an issue with it for the Fall/and roughly Feb 20-Apr 20, but it's not a good match for the core of winter. The ND/Montana border looks like it could be literally 25 degrees warmer than December 2009, and that's the "path" cold takes to reach a lot of you.

MJO looks like it is going to rapidly weaken now. Not much support for a run through 8-1 at high amplitude. I think it dies in 7/8, maybe even 6. The upcoming massive dump of moisture into Eastern NM in phase 6 reminds me of Goliath in 2015, when the MJO was in phase six as well. Someone in the High Plains of eastern NM or TX could luck into 1.5-3.0 inches of liquid equivalent, with most of it falling as snow. I enjoy snow, but I would prefer to not see the cattle ranchers lose tens of thousands of their livestock in this event. I'm a bit concerned someone is going to get a major freezing rain event out of this as well. This system looks like it has much less cold than Goliath, so the snow/rain issue is going to be more of an issue than in 2015. Track will be key too, and the models never know what to do with cutoff lows over the high terrain. I've always enjoyed the observations from Roswell in late Dec 2015 - temps range from +4 to +71, with 16 inches of snow reported. 2015-12-25 71 29 50.0 9.0 15 0 0.00 0.0 0 2015-12-26 51 25 38.0 -3.0 27 0 0.16 3.2 0 2015-12-27 30 24 27.0 -14.0 38 0 0.28 12.4 3 2015-12-28 32 10 21.0 -19.9 44 0 T T 15 2015-12-29 31 4 17.5 -23.4 47 0 0.14 1.2 13 2015-12-30 28 8 18.0 -22.9 47 0 0.00 0.0 14 2015-12-31 37 10 23.5 -17.5 41 0 0.00 0.0 12 https://en.wikipedia.org/wiki/December_2015_North_American_storm_complex

The East-West timing component of the Bering Sea Rule is nearly infallible to me - just wish it was more reliable on the north/south axis. I'm expecting the MJO to pick up amplitude in 5-6-7, slow down a bit, and then crash pretty quickly in 8. We're in phase 4 at high amplitude on 12/5 in an El Nino. So the comps are not many. In terms of the rotation, we're about half way between 2014 & 2018 timing. CPC has been showing 1991 a lot in the 6-10 and 8-14 periods as an analog, that was the year in my group that I liked most for December in my analog group. Dec 1994 is basically dead on to MJO timing at the moment. ~ish. 6-7 transition is often pretty stormy here in December, but not sure if it that will work this year with the -PDO.

Here is current snow across the US - Going to take a little while to fill in with the warmth coming this month. November was remarkably dry actually, on a national basis, although you can sort of see where the storm track was. Fairly consistent track of storms from Reno to Brownsville and then east to Florida. I've mostly been skeptical of a lot of snow in the Northeast on a precipitation basis for winter, rather than temps. That weird island of deep red right over Boston makes no sense to me. But it was there when I did my analogs for the winter too if you go back and look at my outlook. The CPC outlook for mid-month today is essentially the warm WPO composite. In a lot of ways, I think the WPO almost never going negative is the real culprit for a lot of the "lock in" of patterns in recent years. It doesn't look like it responded as directly to the MJO 4/5/6 looks in the older days. CPC has the EPO correlated most strongly to the TNI in December (trans nino index, essentially 1.2 v. 4), so the warm look coming is a good reminder we're not in a Modoki setup. Or even close to it really. Just not enough cold around to match December 2009. Never been a fan of that year for the core winter. It'll get better as an analog again in March, maybe late February when this event begins to collapse from east to west.

100-180W Subsurface Heat Year Sept / Oct / Nov 2018 +0.98 / +1.47 / +1.25 2009 +0.76 / +1.04 / +1.75 2006 +1.13 / +0.80 / +1.35 Blnd +0.96 / +1.10 / +1.45 2023 +1.03 / +1.13 / +1.50 Subsurface heat for November warmed up less than in Nov 2009. The blend is consistent with my 'dueling cold pocket' idea for the winter, with one in the South and one in the West. https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ocean/index/heat_content_index.txt My winter outlook had a brief monthly peak around +2.0C at this time before rapid decay late winter. I still think that's the right idea. Canadian had La Nina conditions by late Spring on the new run.

Ladies and Gentleman, MJO phase five. Is it right? Who knows? But it makes sense conceptually. November and October were pretty shitty forecasts though in retrospect from the Canadian.

Where are these Decembers that are cold in the East with MJO in phase 4-5 at the start of the month? I'm sure you could find some ancient year when the Earth is vastly colder that did it. But the recent years with any resemblance to recent patterns are 2017 which is a horrible analog, and then 2014, 2015, and 2011. Also 1999 which is very warm. I guess you could throw in 2000 and 2017 but they just don't match recent looks in any way shape or form. I don't know why you guys care what I think. I sure as hell don't value the inputs in here. You've all been posting the same stupid maps of tropical forcing that have no direct relation to our actual observable for months. Find methods that predict the weather and use them.

When was the last time the East was cold when the MJO went into phase five in December? It's not rocket science guys. We're going into phases 4-5. The Pacific is record warm in Nino 4 and the Indian Ocean is dis-favorable for the MJO weakening in 4-5. The MJO is predictable. You just have to master elaborate concepts in mathematics...like counting. I don't know why you guys can't learn this stuff. Gee I wonder what will happen.

The models have been pretty bad so far. Although the CFS does have a warm December. It can at least see the tendency for systems to undercut the northern heat. My unweighted analog blend from August beat the Canadian (currently +3 to +6 in the Northern Plains, not cold as the Canadian shows). I did get cute in November by changing the weighting of the years in the forecast. But overall, the raw blend +1 for its age did just fine. Local snow, precipitation, and high profile for November is nearly identical to the blend. November is already at an inch of snow here (let's see if my troll gets annoyed), with a bit more possible by 11/30. We've had double our normal precipitation. First month to do that since October 2022 locally. Month will finish warm, but not much. It's been cold lately, and yes the cold lately is centered in the Plains/West. I would invite all of you to look at precipitation patterns - Nov was an interesting month for precip. Observed:

Subtropical jet looks like it is placed pretty differently to 2009 so far, despite that November being a pretty good temperature match nationally. After this month, I don't think the pattern will look much like 2009 for a while, likely until March. Northwest and Southeast moisture paths are completely different for November. Through 11/19, we're at about 0.5 inches in the city in 2023. All of Nov 2009 only had 0.04". The wetter El Ninos in my outlook group included 1972, 1982, 1997, with 1991 near-record wet, and then 1951 and 2009 quite dry. I've always liked the 1972, 1982, 1991, 1997 group more for precip than temps, so it's nice to see that working out so far. I think you can see on the precip pattern why I've been skeptical of a 2009-10 / Modoki outcome. I think the precip patterns will be off from the ideal Nor'easter track later on. A lot of times the Oct-Nov precip patterns that setup more or less repeat, shifting north/south with the day length.

My personal view is the models that have the Northeast / Midwest pretty warm are looking at the very warm waters consistently by Japan. They're seeing ridging there, and they have it continuing through winter. That's a +WPO look, and it's hard to get real cold with that in the East. I've been pleased with the progression of the Fall as an anti-log to 1993. That year anti-1993 look has been very useful so far. It's super cold, coldest north, while 2023 is very warm, warmest south. Fall overall should finish like a blend of severe -PDO years with some warm Nino 1.2 years blended in there. To me, Fall looks a lot like 1947. Lot of other years with similar patterns to 2023, that are a step or two below 1947 including: 1940 (El Nino), 1956 (La Nina), 1960 (Neutral), and then arguably 2004, 2007, 2011, 2016, 2021. Good luck I guess Easterners? 1983 isn't too bad either. These were not my analogs, but if you had to pick the most similar Fall temperature profiles for the US, I think its maybe 1940, 1947, 1956, 1960, 1983, 2004, 2007, 2011, 2015, 2016, 2021 - very similar to the blend shown below.

Nice to see more rain and snow coming for me. Driest 12-month period for any time frame, i.e. Nov-Oct, Jan-Dec, May-Apr, etc back to 1892 is around 3.5-4.0 inches here. We were flirting with those record dry periods in the absence of rain in July. Starting to reverse now. It's almost like the subtropical jet is responding to an El Nino or something.

Bering Sea Rule implies a major system pulling through the Southwest US in the Dec 5-9 time frame. Broadly consistent with my analogs. Almost all of the six analogs had a snow event between Dec 8-12 for the SW. Major lows south of Kamchatka tend to pass over New Mexico in 17-21 days. Unweighted analog blend from me from October has represented November fairly well, with more heat coming in the short term.

The anchovy supply collapse this year is another feather in the cap of the Peruvian fishermen from day of yore. Inflation/Deflation in certain types of foods directly impacted by ENSO is another metric you can use if Nino 3.4 SSTs, MEI, ONI, SOI, RONI, PDO, NOI, forcing, MJO precipitation patterns and the PNA indicators aren't enough. https://weather.com/news/climate/news/2023-11-06-el-nino-anchovy-shortage-peru Niño was born in the Pacific Ocean off Peru. Hundreds of years ago, fishermen in the region noticed that the water warmed every few years in their winter, and their catch declined. They called it “El Niño de Navidad,” or "The Christmas Child." Peru has the largest anchovy fishery in the world. “Most of the anchovies in the world in terms of tonnage come from Peru,” John Phillips, procurement director at Roland Foods, told us. The country produced about 4.6 million tons of the tiny savory fish in 2022, according to industry reports. Anchovies feed on plankton forced to the surface by upwelling, which happens when winds push water across the ocean surface and colder water rises up from beneath. El Niño disrupts that process.