snowman19

Yes, that was a big part of HM’s disco on this topic (-QBO/-ENSO resulting in a flat Aleutian ridge and +QBO/-ENSO resulting in a poleward Aleutian high). He actually went into a very detailed disco with a bunch of images in his blog. Shame I can’t find it anymore to share on here

The last true DC-PHL-NYC-BOS corridor KU snowstorms were back in February, 2021. It shutdown at the end of that month, never to be heard from again

This was mentioned extensively last fall….the research showing that +QBO/-ENSO causes a more poleward Aleutian High, while -QBO/-ENSO causes a more flattened, equatorial Aleutian Ridge. HM had a blog on this many years ago, which unfortunately I can’t find the link to anymore. IF this research is correct, then we will see it come “cold season” (Nov-Mar).

The east coast, from the mid-atlantic up to the northeast is very quickly going into full on drought conditions again. Been dry as hell since August 1st. Shades of last fall

The bizarre MJO behavior continues

Unlike last year when we were in a +AAM regime, this year we are and have been in a strong -AAM, so definitely much more Niña like in that respect @so_whats_happening Australia’s BOM has changed its parameters for La Niña classification:

@bluewave @donsutherland1 Lack of eastward MJO propagation, -IOD and persistent strong trades has lead to a deep -AAM and La Niña like regime

Maybe the time has come to rethink parameters such as SSTs/AMO and ENSO for seasonal hurricane forecasts….

@Gawx This may well turn into the strongest -IOD event since 1917 and 1933….

I would agree that 2013-14 was a once in a lifetime pattern. It was one of the most, if not the most anomalous, persistent +TNH patterns on record. Extremely unlikely to see such an anomalous +TNH pattern again, especially within 12 years…..

Home come? Because 2nd year Niña’s very strongly favor -PNA

I can see -EPO. +PNA? Not really

IMO a ton of cooling has to happen in the northwest PAC over an extended period of time this fall. The cooling pattern has to be sustained over a long time. Let’s see what happens. SSTs that far above normal do feedback into the pattern and alter the global heat budget. If we were talking about anomalies of +2 or +3, then yes, I’d agree that it’s not feeding back, but this incredibly warm? I think the latent and sensible heat release absolutely does alter the global long wave pattern and is a very important factor like @donsutherland1 pointed out @bluewave

A ton has to shift for 13-14 to be a good analog. Besides the anemic Atlantic tropical season, low arctic sea ice and the cold North Atlantic SSTA, I see very little matching up. No -IOD, as you pointed out the PDO is so far from a match it’s not funny, that was a Victoria mode (basically +PDO alignment) back in 2013, it was +QBO, solar/geomag was rising off of a solar minimum, no La Niña back then; cold-neutral, no -PMM. Since the PDO cooling over the last 2 weeks in the northwest PAC was brought up yesterday, yes it cooled, but it started cooling at over staggering +11F SST anomalies there and as has already been stated by @bluewave those record warm anomalies are very deep in the subsurface. Here is the latest OISST, look at how insanely warm the anomalies still are:

As a general rule with La Niña winters, if there’s below average snow in November and December, they end up being dud winters. Yes, there are exceptions, but for the most part, November and December set the tone for the rest of winter with a La Niña

Bottom line, even though there wasn’t a ridiculous amount of arctic sea ice loss this spring/summer/early met fall, our starting point at the beginning of melt season was so low, we are still finishing at record low levels this year. God knows how many years it will take, when/if we get back to normal. Whether the arctic sea ice loss is related to SSTs or solar or both is anyone’s guess

@Bluewave Once again, tropical forcing staying in the IO and the Maritime Continent regions…..

2011-12 didn’t turn into an all out disaster until the end of November. A few days after Thanksgiving that massive Bering Sea vortex developed and just sat and spun there for months on end…right through April. It was one of the most persistent patterns I’ve ever seen. There was damn near close to consensus on east having another cold and snowy winter and all those forecasts busted horribly

Models have completely backed off on any Atlantic tropical threats for the next 2+ weeks. We are starting to approach the point where we are going to have to accept that this may end up being a below normal season (ACE/named storms) despite the La Niña

The fact that the EURO is seeing it now speaks volumes. It’s finally showing a La Niña, the last to the party as always with its extreme ENSO warm bias