Stormchaserchuck1

NAO has been trending better recently (the last few Winters).. I think we are seeing a general northern lift of the jet stream, and it doesn't have so much to do with PNA, EPO, etc. It actually seems to be East Coast based, because I see the Pacific and Atlantic fall in line together. I would even go out to say it seems like Energy traders are influencing the patterns. A lot of times last Winter there was rain up into Canada, and during a few of those times the NAO was negative! Maybe this recent Sun spike will shake things up? Otherwise, I can see -PNA pattern prevailing once again, and lately it's a pattern that has extended a ridge into NNE and SE Canada. We have been seeing deep troughs dig into the West coast the last 2 Winters. I think that is hopeful.. usually what happens out there leads us by some time (years). But I don't want to see another dry/hot Summer there.

Thanks @calm_days!

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Models were trying to develop an Aleutian island trough the last few days, now it retreated to mostly Alaska and the Gulf of Alaska. That's what I'm referring to when I say the PNA, the N. Pacific pattern since it correlates most with the actual measurement. -PDO is associated with cooler water in the Gulf of Alaska, so that's why it's retreating to more of a -PDO pattern, while the -NAO trends greater on models. They do try to bring an Aleutian ridge in the late part of the model run after June 10th.. I think +days it's associated with NAO. I'm just talking about trends and intuitive observations. Edit: You posted the 12z, I was looking at 6z. It does deepen a +PNA low in the long range when you point out. I don't think that disqualifies the correlation though, although not 100%.

I wonder if for years after this solar max, the -PDO holds.. The cycle started after the 98-99 Solar Max, and the sun was the quietest since the early 1900s, 2000-2020.

-NAO building in June on models. This, is as the Pacific turns more -PDO oriented. The correlation is there (-PNA bursts associated with -NAO, +PNA bursts associated with +NAO).

This La Nina event is surprising to me. I thought we would start trending toward more El Nino's.

That started a long time ago.. back in the early 2000s, every Summer had a Rockies-based ridge.

I just think the data kind of argues against it, especially early in the Winter. You were the one who pointed out the PDO actually has a higher correlation in the N. Pacific than ENSO. Look at this Oct-Dec composite.. >0.6 correlation in NW Canada, going back to 1948 (not even over water)! https://ibb.co/JHs3qrp

Cool.. I'm glad you're into long range forecasting. I've noticed a Hadley Cell expansion over the last few years, and in my opinion more stable factors have higher weight right now, but we do create a dichotomy for some extreme events to even it out at some point in future time (years to decades). https://ibb.co/KLdH8ZL Therefore, I think some form of consistency could be a more effective way to go right now (-PDO is in its 26th year and +AMO is in its 29th year, and they are both still deepening!).

Models have a pretty good +AAM pattern starting early June. this may keep the La Nina peak near Moderate strength vs Strong. raindancewx has posted that we have a tendency to warm La Nina events since ~2000-05. The overall global warming trend may make it harder to see Strong La Nina events in the future, per the ONI. I still think the La Nina-base state that we have seen since 2000 is pretty incredible. This means that we are seeing La Nina patterns generally, even when it's not a La Nina. Some are quick to blame it on the PDO, but water is more reactive than proactive imo. Southern Hemisphere version of the PNA has also been pretty on par with the N. Hemisphere during that time, which means that forcing might be coming from the equator.

Models have a cooler start to June with -NAO trying to develop.. If the ridge over the Davis Strait ends up verifying, that would be good for my N. Atlantic SST prediction of wintertime NAO state, but still a long ways to go (the index measures through September.) I also think a ridge is going to try to develop over the West coast through June, then it may work its way to the Midwest by July and August then the east by the end of the Summer.. there is a chance it could come here sooner though, but GEFS looks troughy through Day 15..

For the Mexican heat wave Since 1998, I have +2022, +2003, +1998, -2014. Here's peak warm season: https://ibb.co/Qf22K0Y (Going forward more: https://ibb.co/g47XqgR)

That old Mexico heat wave is really interesting. I thought the SE ridge would flex in the Spring, as things seemed to be trending drier in the Winter, we were having a lot of cloudless days. It's been the opposite, wet and cool. But the Hadley Cell expansion energy appears to still be there, just little further south. I think at some point it will flex over the CONUS. Any other analysis you have of the heat wave there?

They always overestimate instability parameters, and underestimate sunlight and actual heating. Last year severe wx started on June 24th, and July was active. This Spring is kind of following the same trend as last year so maybe July will be our severe wx month again..

Another matter of concern is if the strong -PDO pattern does set up for Hurricane season, it could favor a pattern that supports GOM and FL hits, as storms track under the mean ridge in the northern latitudes. https://ibb.co/QvQ5rzm For east coast hits, you want that ridge further east over New Foundland and SE Canada.

I think recent trends favor warmer than normal, since 85% of our months are ending up this way now on average. And we are having peaks, where we hit 80 in DC on Jan 26th, which was the first time ever for I think 12-1 to 2-28 (the coldest day of the year on average is Jan 27th). I am no way getting the super warm Winter vibe though, part of that is the N. Atlantic SST index that I monitor for the following Winter's NAO is slightly negative, and it's been a temperate Spring, which went against the SE ridge trend that I thought would prevail. Arctic ice is also all the way down to 14th lowest. I also found the SW, US leads us a lot of the time, and when they were getting anomalous High pressure all the time 1995-2020, that boded bad for future Winter's, but the last 2 years troughs have really dug deep into the SW, which has broken that trend a little bit.

Stronger La Nina, record -PDO, record +AMO, Solar max, and probable +QBO (+QBO/La Nina combo favors strong 10mb vortex and +AO), this definitely looks like a warmer Winter, but it was in the 40s in May so you never know.. sometimes La Nina patterns can be blocky.

Yeah, crazy -PDO right now. Some of the SST maps were showing +5c anomalies south of the Aleutian islands. The PDO correlated with the weather pattern more than ENSO in this past Winter, and the historical correlation composites actually shows that this is the case most of the time! (There are just a few months where ENSO correlates greater, even though I think the ENSO effect has been strong for the last 70 years). The Earth is "tranquil" right now, so I think that stuff is probably amplified. Good signal for Summer heat in New England.. +0.3 is pretty strong for a 3-month average, going back to 1948. https://ibb.co/4YjNgPg ^I think the CPC currently has a similar temperature map as their Summer forecast. (Remember, the map I posted above the correlation is opposite) October is a really strong map for temperature correlation. https://ibb.co/4fLngZK

La Nina is coming in real nicely on CDC daily composites. Starting east-based like the last few we've had since 2000. https://freeimage.host/i/JLxCQov

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Central-subsurface is holding -4c anomalies.. I think we heading for a Moderate La Nina per the ONI (Keep in mind the global warming trend, which is about +0.3c for ENSO since the 1950s.. that's why last Winter's -PDO pattern was such an anomaly, and heightened the importance of the -PDO in these recent times..)

We did see a trend break 2 years ago when there were 14 NS and 2 MH in a La Nina year. I'm not saying the same thing will happen again, but a lot has to go right to get 20+..

Wow.. 90 in Dulles just like that. These -PNA patterns don't disappoint for warmer than forecasted temperatures.

It's possible.. this is a pretty decent correlation. https://ibb.co/hKxYby3 https://ibb.co/C7Pf8FK https://ibb.co/KNws8fF