Stormchaserchuck1

Also a strong Gulf of Alaska High pressure has been there June-July Analogs US Temp pattern of analogs

This Summer has been significantly cooler in the Southwest, US. Last year Phoenix was breaking records by >+2F, and the roll forward of those very warm analogs had a +PNA in Dec-Jan.. It was a good indicator. But we don't have that this year.

24-25 is probably my top analog for 25-26 right now. Since 2014 though, there have been only like 3-4 periods where we had sustained below average for a 2+ month period, like last Winter. So the odds are stacked against it. It's not impossible though.

That lack of ice melt pattern leading to -AO is really neat.. I almost want to think that the cold there in the Summer is artificial because of how it snaps the following Winter. I'm leaning toward something not so +nao and -pna. I might not do a seasonal outlook this year because of how close everything is to "neutral". We'll see.

Because of shortened wavelengths in the mid Summer, July has a +temp correlation with +PNA from ATL to NYC

Here's the Winter US Temp map Believe it or not, 5/6 of those +analogs were below average snow here.

We've had a hostile Arctic this late Spring/Summer so far It's been pretty amazing to not break 2012's arctic ice melt record for 13 years now. Since 2012, here are the analogs to pattern: Following Winter: It seems to "snap back" in the Winter, with -AO

Since 2012, this is what the following Winter looks like in years with -SLP May-Aug 60-90N vs +SLP (anomaly map below is showing negative base, with both sides included). This is why I think the Euro seasonal has that pressure map in the Pacific despite -PDO, and why the CPC is going cooler.

Actually us not breaking 2012's record in this time of exponential global warming, for now 13 years.. is just as impressive. 2021-2024

With 61% of the period complete, it's at +0.20 for DJFM NAO. Given the 0.54 sd, which has hit 11-9 since inception in 2005, it has a 50% probability of being in the range -0.34 to +0.74 Winter NAO.

I mean, it's pretty important. I think the pattern derives right from the subsurface.

CPC subsurface continues to be much different from TAO/Triton.. it's holding a warm pool in the western-central subsurface, below the dateline.

Barry obviously loves weather. He doesn't bother me.

SOI has been solidly negative for the first time in a while, during the last 3 days. This has occurred with the ENSO subsurface cold pool no longer deepening.. the anomalies have moderated from -5c max to -3c max. 5 Aug 2025 1012.75 1014.10 -18.03 4.89 2.94 4 Aug 2025 1012.63 1014.25 -19.66 4.67 3.20 3 Aug 2025 1013.49 1015.10 -19.60 4.77 3.40

Yeah, in the NAO roll-forward we would have to get -EPO to balance out those US Temps with such a strong +NAO going on. I just think it's cool how they pick their own unique landing place with the northern latitude trough, not in what's occurring or has occurred, but going forward.

^They don't often go extreme though. A lot of it is the average error factored in. Compared to the N. Hemisphere, we are about in the middle of the warm anomaly.

^Here's how they roll-forward

It's very interesting! consistency usually dominates. This is the next three 7-month periods for the NAO, going to April 2026. US Temps aren't as warm as you would expect AO is completely different rolled forward - it's not a negative H5 based over Greenland, but over the Arctic circle and north of Alaska!

Be happy it's not Winter July was the 6th consecutive month of +NAO. Cumulative NAO value of +3.75 in that time. July was the 5th consecutive month of +AO. Cumulative AO value of +3.2 in that time. It's looking like August may be the 7th consecutive +NAO month, with a projected Aug 1-15 value coming in around +1. The odds of having 7 consecutive months in either direction is 1/64.

The CPC monthly page has updated July was the 6th consecutive month of +NAO. Cumulative NAO value of +3.75 in that time. July was the 5th consecutive month of +AO. Cumulative AO value of +3.2 in that time. It's looking like August may be the 7th consecutive +NAO month. The odds of having 7 consecutive months in either direction at random is 1/64.

It snowed here 15 times last December through mid January in +PNA.. I will always take a +PNA pattern, I think it's somewhat underestimated. It also has 4x lower coastal SLP correlation vs -PNA.

Does the Euro develop La Nina?

Did you guys see the CANSIPS 0.0 month lead forecast for July? Congrats Iowa The Euro has had some big misses the past 2 Winters, from the Fall. I honestly think that seasonal models should be built to do better, You can run forward certain variables and get a picture. I always wondered if you take and combine analog data from 200 world cities, if it would produce a successful roll forward.

I don't think we will get a SE ridge if the Pacific H5 looks like that for the Winter. Their Pac ridge might be far enough south though.. I think it's persistence as last Feb looked like that with the dominant +h5 over 90N. Crazy how much it looks like June-July.

I think there is KU potential in mid-late January, but the wild card is the NAO. I don't think the NAO will stay negative for more than 10 days at a time this Winter.. if it can line up with what I think could be a GOA low pattern in January (if La Nina doesn't go too strong), then we might hit a good storm. If the ENSO subsurface is -4 to -6 during that time though, forget it..