snowman19

December, 2022. People were all but guaranteeing a December, 2010 redux with textbook KU’s bombing up the coast and the I-95 corridor getting dumped on. It was even called a historic setup by many and we were told to “buckle up, get sleep now, it’s coming”. The hype was off the charts for the better part of 2 weeks….

Obviously way too early to declare victory, but if this SPV progression verifies, at least the December ideas in your winter forecast are going to be very good. Paul Roundy is also in agreement with you that the PNA goes negative/RNA once we start getting towards mid-December based on the expected progression of low frequency tropical convective forcing….. ^ “This morning's zonal GPH anomaly plot + GFS forecast, showing the strato PV disturbance peaking during the week/10 days, and reaching down to about 50 hPa. There appears to be some propagation to lower levels later on, but the models contrast sharply in this regard, with ECM showing a re-strengthening of the PV in the same timeframe. It aligns with the overall trend observed, with the current PV displacement resulting from a stronger strato anticyclone over Alaska/Canada, and the vortex core shifting over Siberia. After that, ENS members show a possible re-centering over the Arctic, with the anticyclonic area losing intensity and effects over the PV. We'll need to monitor what happens in the next two weeks or so.”

If Simon Lee is correct about 96-97 being a stratospheric analog, then a strengthening SPV into January would fit

Then I stand corrected on that part of my post. I thought December, 83 was +QBO, my bad on that. But the other aspects I mentioned are definitely correct

As per @GaWx research, 1983 did not have any stratospheric warmings in November or December. Furthermore, 1983 was a volcanic winter with a volcanic stratosphere; courtesy of a VEI-5 tropical eruption the year before in 1982. It was also a +QBO winter and a had a strongly +PDO

@40/70 Benchmark Would love December, 1996. That was when the famous Jim Cantore 4 inches per hour thundersnow storm occurred in Worchester, Mass

That post had nothing at all to do with the tropospheric MJO. It was the stratosphere only, which Simon Lee believes (in his professional opinion) resembles 96-97. But with regard to the MJO, we won’t know for certain that the MJO actually goes strongly into phase 8 until it happens, it’s simply a computer generated projection right now

Simon Lee has been saying 1996-97 is a good stratospheric analog for over a month now. It’s not like some twitterologist is saying this either. He’s one of the foremost authorities on the stratosphere, has written many published papers on it

There are no absolutes, definites or guarantees in weather. You, me or anyone else can’t guarantee MJO phase 8, a SSW or that December is going to be cold on November 20th. If I made a post like that saying it’s going to be warm you would have jumped all over me

I forget which winter it was recently…maybe 23-24? The EPS was awful all winter long with the MJO, November right through March. It kept showing amplified waves propagating right through phases 8-1-2 in the long range over and over again and it never happened once

So does the EPS

From Dr. Simon Lee, for those who don’t know, he’s a college professor of meteorology and an expert on the stratosphere, has written many papers on it. Here’s what he has to say:

I wasn’t talking about on here you bozo. Did you even bother to read what I said or you just saw that I dared to say “not extreme cold” and you saw red. Oh wait…..you never see red

Huh. So I guess they’re actually not showing “extreme cold” like I just read on twitter. Man oh man, you have to be really careful who you follow there

I’m not sure we can be confident on a west coast ridge for mid-late December. Paul Roundy has been vehemently disagreeing and thinks the subseasonal forcing supports -PNA/SE ridge after early December. When he talks you have to listen, the guy basically wrote the book on the book on the MJO (Roundy MJO plots)

FWIW, Judah updated his SPV blog for anyone interested:

Flurries/on and off snow showers in Sloatsburg. Nothing sticking anywhere. 35 degrees

I mean, he totally went against what the EURO weeklies and the other ensembles were showing run after run for early December and if that should actually happen, maybe he’s onto something?

https://www.twitter.com/paulroundy1/status/1989372780652237091?s=46&t=NChJQK9_PUjA1K7D2SMojw https://www.twitter.com/paulroundy1/status/1989823502162301098?s=46&t=NChJQK9_PUjA1K7D2SMojw

Paul Roundy actually expected this cold shot at the start of December based on his tropical low frequency forcing plots. He’s been saying for weeks that the SE ridge would be at its weakest in early December then get stronger post 12/10

Region 4. Looks basin-wide

Lowest Nino 3.4 SSTs this fall (since Sept 1st)

Probably real unlikely that this winter will be as bad as 22-23, that was one of the worst in the last 30 years in the NYC metro area, 22-23 ranked right up there with 97-98, 01-02, 07-08, 11-12 and 19-20. The clue to look for when there’s a La Niña is what December does….if December ends up with below normal snowfall, especially if November has no snowfall, followed by a below normal December, that’s a very, very bad sign. Usually the kiss of death for the remainder of winter in the NYC metro area

DT warned yesterday that the MJO push into phase 8 is looking like it’s going to be delayed…

IF (If) the GEFS, EPS and GEPS are correct in how far west the ridge is going to set up (Bering Sea/Aleutians) in the long range, then yep, they are underestimating the SE ridge