snowman19

Here are some good sources: https://en.m.wikipedia.org/wiki/Indian_Ocean_Dipole http://www.bom.gov.au/climate/enso/history/ln-2010-12/IOD-what.shtml

Thanks to JB, a certain percentage of the population, particularly on the east coast, live in a delusional alternative reality and think AGW is a hoax and we are really going into an ice age. Any talk of a warming climate is just a big lie and a conspiracy. Black is white, white is black, down is up and up is down…..

AGW is also playing a big role in the present day….when analogs from 20+ years ago are used, it has to be done carefully with respect to the new warmer background state, the type of cold back then should not be expected this time around even if everything else matches up analog wise, on a smaller temp scale, don’t expect the same cold result you had 20+ years ago

-IOD’s serve to enhance La Niña development. El Niño’s very rarely happen along with a -IOD, the overwhelming majority of the time you see a +IOD with El Niño. You can see a positive or negative IOD phase with a Niña, but the -IOD really helps to augment the Niña state. When the IOD is in a very strong positive or negative phase, as it is now, its effects are even stronger. It is currently having a very significant impact on the MJO waves and their propagation, as I posted earlier, I would expect this to certainly continue into winter…..

@bluewave @donsutherland1 We discussed the very strong -IOD event a couple of weeks back, it looks to be having a very significant impact on MJO wave progressions. This may prove to be really important going into winter:

@40/70 Benchmark Something else to consider is the strong -IOD, it may alter the MJO wave progressions into this winter:

The models playing catch-up and getting stronger with the Niña as we get closer in time to fall….shades of the last 2 summers:

Yea, Dec, 2000 was cold, Jan and Feb torched then winter made a comeback of sorts in March, 2001. I was a young kid then but I remember the “blizzard” that never was early that month that shut NYC down for no reason. All the blizzard hype in the days prior for nothing

Well yea about the QBO last year lol I guess it helped as much as the low-solar, Siberian snowcover/SAI and arctic sea ice arguments the last several years

What are your thoughts on 2000-2001 being an analog? I’m seeing a lot talk of that on twitter which I can understand for the 3rd year “triple dip” La Niña and -PDO, not sure what the solar state/cycle was doing at that point. My issue is the QBO, it was going negative into that winter and this year it’s going positive, I see that as a big issue. We also did not have a very strong -IOD as we do now. And we have to account for AGW 22 years later…..

I’m seeing some grumbling about 2000-2001 being a possible analog for this year, which I can see for the triple dip La Niña, and also the -PDO, however, the QBO was going in the opposite direction from what is it now, it was going negative into winter, this year we are going positive and I’m not sure of the solar state back then

We are in the running for the 1st legit drought in the NYC metro area since 2002

@bluewave @donsutherland1 Do you guys have access to the QBO forecast projections? Just read a tweet saying models are showing it getting very strongly positive come winter. Thank you in advance

Huh? We are currently seeing the strongest easterly wind burst in history. And we are in a long term -PDO cycle. The Niña is about to strengthen big time

We are about to see very impressive Niña strengthening:

The new NMME has trended stronger with the La Niña and the -IOD. It peaks the Niña at moderate strength late fall into early winter:

It’s hard to believe there hasn’t been a legit drought in the NYC metro area for over 20 years. I guess the streak has to be broken eventually. I honestly can’t remember it being as dry like it is right now in my memory, the soil moisture has to be way low, there’s a lot of brown lawns to be seen in my area…..something that has been very, very rare in recent history

Good post. I think the big unknown is the effects of the record amount of water vapor it ejected into the stratosphere like you had mentioned

The eruption occurred back in January, there is a lag effect of several months. That said, a tropical volcanic eruption of such an extreme magnitude that pumps up into the stratosphere is definitely going to have a major effect on the weather. The amount of water vapor, ash and sulfate aerosols it released into the stratosphere was enormous. The exact specific effects it will have are unknown yet, however, it will definitely have a very notable effect on the stratosphere/weather of some sort

@bluewave @donsutherland1 To add on to the stratospheric (volcanic) impact discussion earlier, the Tonga eruption is ranked one of the largest ever in history: https://www.zmescience.com/science/geology/the-2022-tonga-volcano-eruption-was-one-of-the-largest-ever-recorded/amp/ 2nd article: https://amp.theguardian.com/world/2022/jun/15/tonga-volcano-afterglow-creates-dazzling-sunsets-across-new-zealand-and-australia

Another trend we’ve seen over the last 3 years is the models underestimating how strong the Niña is going to become in the fall, they end up having to correct stronger as we get closer. This year is no different. The new Euro and CANSIPS runs have gotten more aggressive with the cooling

Here comes the next round of La Niña strengthening. This trade wind burst is going to be followed by persistent easterlies and trigger an upwelling Kelvin wave and significant ENSO region cooling in the coming months. The persistence of this multi-year Niña event is crazy

It was just a matter of time. That La Niña means business and all the factors (-IOD, etc.) are in place for it to strengthen yet again….I don’t think a moderate peak in early winter is that far fetched. And yea, that new Euro is an ugly look if you don’t like heat. Aug-Oct looks nasty, SE ridge city. I think the things to look at going into winter will be 1) How strong does the La Niña get? 2) What does the stratosphere do, given the recent volcanic eruptions and the record water vapor that was introduced along with the volcanic ash and sulfate aerosols? 3) How strong does the +QBO get? 4) Does the high solar/sunspot activity continue? 5) What does the -IOD do? A -PDO/-PMM is pretty much a certainty, not much question there

It was just a matter of time before the WAR/SE ridge popped back up given the La Niña/-IOD/-PDO forcing in place. It is very well coupled with the atmosphere (SOI/MEI). It would not be surprising to see August and September torch, given the upcoming Niña strengthening expected

Evidence is growing for a very strong +QBO event by winter. HM just pointed out, this may have been the most rapid rise in history: