SnowGoose69

This feels like a 2/8-2/11/94 sort of event...it has potential to be a rare SWFE type setup where the metro is mostly snow or at least all frozen.

I believe shortening wavelength as we progress through Feb would make that link up less likely to occur but I'm not sure on that.

I think some snow may occur the next 10-14 days but the odds of something big are low. If it happens it'll be some type of February 94ish event probably. I don't think in this pattern we are going to get a classic KU or even a big coastal.

I'm beginning to think we need another 82-83/97-98/15-16 Nino to change this

In that setup the block would have to be much further SW. that’s not necessarily an east based -NAO but it’s too east based for the pattern over the US. Also that piece over the northern plains might phase in to an extent. It might work out for New England but not the MA.

I would not be surprised if this is just a repeat of the weeklies from the last 2 winters. They want to keep bringing in the ENSO pattern and it never will happen

Yes and no. Its had trouble resolving the blocking pattern and pattern shift about the same...it does not have ensembles so I could not see those but its Op runs were pretty regularly trying to crank southeast ridging and cutting storms 7-10 days ago and look where we are now. Its still occasionally trying to do it. Its best improvement is it has less of a near term cold bias it seems.

Its probably 2 weeks too fast with it. My hunch is this pattern will go til 2/1-2/5 before there is any chance of a flip

I think it technically nailed 2/8/13 before any other guidance so 2023 might be the next coup

The GFS finally resolved not having the SER now its the only model that next Wed-Fri wants to pull a pre torch ahead of the PV drop...it'll end up wrong on that too

Pretty crazy how both the events at 144 and 210 in N AL and N GA are basically both rain due to lack of cold air

Ensemble wise nothing much has changed. The pac change is still showing but both the EPS and the GEFS are showing signs the AO and NAO could move towards neutral by day 15. Given we are in a La Niña that’s entirely possible as mid January approaches. At the same time though ensembles have been trying to show La Niña type pattern shifts on and off at the end of the long range since late November and have continually failed. Even the weeklies are trying to show it somewhat at week 4. It’s possible the true La Niña change never happens because so far every time it pops on models it never comes

I presented on that storm as a research paper and it was truly a cruel evolution. Almost nobody remembers this but the shortwave or upper disturbance which produced the 12/30 storm was responsible for acting as a kicker to a previous shortwave over the southern US that was supposed to phase on 12-28 or 12-29 with a strong Great Lakes shortwave somewhere in the TN Valley or MA. Instead the 12-30 eventual producing disturbance booted that Gulf one out to sea and the big one didn’t happen. The storm that was initially shown on models 4-5-6 days out for 12-28-29 was a monster that would have hit everyone hard up the coast

Up until recently there were hardly any major events with a positive NAO. Certainly there were some big overrunning type storms or southwest flow events but these borderline KU events with deep coastal lows occurring with positive NAOs is mostly something that’s only occurred in the last decade

Not really. The PAC was really good otherwise, even for the earlier December events which I think two changed to rain at the coast. The pattern out west broke down for a while there in mid to late December.

Even the Para has been trying to crank ridges in the east past day 7 on many of its runs. It hasn’t been as awful as the GFS but it’s still doing it. Just look at the difference in the GFS Op runs today at 12Z compared to the Euro at Day 6-10. One has 534 thicknesses to Atlanta the other has highs of 65 in DC

I think it’s classified on a Niña by some and not others. Same as 96-97 and 89-90 are classified as neutral by some and weak Niña by others. 17-18 is a better example of a La Niña winter with several progressive suppressed deep southern snow events

It is amazing to me how much the GFS Op continues to struggle with this pattern. It just wants to cut and build the southeast ridge on most runs beyond day 7-8. The difference in the 12Z runs today for the Euro and GFS day 8-10 is just astounding and it’s been several consecutive runs more or less with that idea

Yeah it was a good example of terrible pacific good Atlantic with a snow event. I always show that event as an example of what a -NAO does

The GFS, especially the Op but definitely a percentage of the ensembles still want to keep cutting things out to 240. It’s pretty evident the CMC and Euro Ops and most of the ensembles aren’t doing that

The GFS has been continuing to have issues of wanting to cut things and pump the SER up until day 8-10. The CMC and Euro have been backing off and will probably verify more accurate

Even if we do it might not matter much of the NAO stays strongly negative along with the AO. It would probably still be a pattern where something could occur

81-82 here in NY. I don't know if it was west based but it was negative most of the winter and the winter had very little snow.

Honestly the weeklies appeared iffy with the EPO...at least from the image I saw in the MA forum there appeared to be hints of smoothing indicating some appearance there could still be low heights in BC/GOA etc. As I said earlier today though, the deeper we go into winter I don't care if the EPO is +10 if the NAO is west based and -4 there will be significant snow chances and relative cold in the East. The NAO matters more and more as we go on and while the Pac does not matter less it tends to get muted more easily by a W based -NAO in Jan/Feb/Mar than Dec

It would not be the GFS if it did not lose a southern stream storm at some point in the medium range