snowman19

That write up Ben did a few days ago on the RONI was good. I agree that it would be the go to metric to use for this event given all the warm around. It looks like the MEI is dead in the water so to speak for now

Just looked further at 1983, the period from 1982-1983 was extremely volcanic. 1983 alone had 58 different volcanic eruptions. No surprise that 83-84 is listed as a volcanic winter Source: https://volcano.si.edu/faq/index.cfm?question=eruptionsbyyear&checkyear=1983

I know 83-84 was considered a volcanic winter because of El Cichon 1982, which was a tropical volcano that pumped sulfate aerosols into the stratosphere. If you have a true volcanic stratosphere, then yes, it should be considered IMO. I believe that El Cichon was a strong VEI 5 eruption that reached the stratosphere back then. This year is a question mark, we obviously don’t have a Pinatubo stratosphere, as that was utterly massive, but will the cumulative VEI 5 eruption we had do anything stratospherically? I don’t know El Cichon history: https://en.m.wikipedia.org/wiki/El_Chichón

I saw in your post from yesterday, you had 1983 as an analog, which was volcanic. I guess you’re assuming a volcanic stratosphere (El Chichon, 1982)? Given the cumulative VEI 5 eruptions we had back in April? @brooklynwx99 Edit: 1983-84

@so_whats_happening Anything new on the MEI updating? Dying to see an update. My guess is that it’s a much different MEI landscape from last year, since everything is coupled much better atmospherically (PDO/PMM) with the developing Niña….

The relentless solar onslaught continues, we also have a strengthening geomag storm in progress:

The EURO has been on again, off again since 18z last night. The GFS on the other hand, wants nothing at all to do with it

Yea I mean that’s pretty much the only thing lol besides those differences, we can keep going…QBO, solar, the AMO wasn’t out of control positive, no New Foundland warm pool, a true tripole developed in the Atlantic

Good points. 1995-96 was the complete opposite of what we are seeing now…+PDO, +PMM and WPAC cold pool. Contrast that with the present…strong -PDO, -PMM, WPAC warm pool with MJO 4-6 dominating. Night and day. The current trend toward a -IOD with a La Niña is only going to further support Maritime Continent convection and MJO 4-6

13-14 was as classic a +TNH pattern as you will ever see. Since 15-16, we have seen -TNH patterns dominating

Besides the PDO difference, which was already pointed out, you didn’t have the massive WPAC warm pool altering the MJO forcing

The 14-15 PDO wasn’t just positive, it was severely positive and it directly lead to the insane -EPO/-WPO/+PNA blocking that winter. There was also an El Niño

Didn’t Raindance only predict a Aug-Oct -WPO or something like that? And as far as your musing that even if the ONI ends up being weak, that this Niña will behave atmospherically like a moderate or strong event this winter, I couldn’t agree more. That is one thing I’m very sure about

Now that the IOD is expected to turn negative, it lends even more support to Maritime Continent convection (MJO 4-6). -IOD/La Niña favors eastern IO and Maritime Continent forcing @40/70 Benchmark @bluewave

Follow up, which explains the very strong La Niña atmospheric response we are seeing, which @bluewave has been discussing. @40/70 Benchmark RONI: