SnowGoose69

The ATL measurable snow drought of nothing over 0.5 for 7 years should end next month.

Might be some showing that funky evolution where somehow the surface low sorta survives the meat grinder enough to exit into the Atlantic and then redevelop and throw moisture back. We've seen Op solutions with that the last 2 days.

It needs to be near BWI-RIC by 4 days out, its gonna be hard to get it back from anywhere south of RIC but I think if BWI is the bullseye at 96 unless this is the 1 in 10 case where confluence is not being overdone at Day 4 its coming north. I still don't know if it can come back enough those to save most of this subforum. Maybe NYC and SE parts of SNE

By 96 we probably want to see a consensus somewhere between the GFS/Euro. If it holds there through 96 if we go off historic tendencies it probably will gradually come north. I've not seen too many cases where confluence at this range is not overdone. Don't want to have to be bringing it back from Raleigh or Charleston though. Parts of SNE outside of the coast might be close to out of it though at this point.

Its crazy that today we've got convection in the area tonight. The OH Valley is getting a perfect track low and its not even snowing north of the low. If you were still living in the 1980s when models only went out 5 days you'd have no idea what was coming

The 18 upgrade was mostly focused on improving its accuracy over mainland Europe. It did take care of the progressive bias it was having in the US though inside of 72 after the 2014 upgrade. You could almost always shift every storm 50 miles north and it would work. It definitely caused a more amped Op bias though from 84-120.

for whatever reason the last 10 or so years it seems the Euro in winter does better in years where either its an El Nino or the PNA is + and the GFS does better in La Nina -PNA years.

the first storm to me the UKIE idea might be more accurate. I think the ridge out west is just way too far west that even with the -NAO the storm will cut

Somehow the NAO/AO both averaged negative that month, the first 10 days might have skewed it enough. That looks very Feb 2011 like from my memory. at least late month

I posted in the SNE thread how if you just took the a trained monkey could forecast this winter by saying where was the last cold neutral or very weak La Nina to follow a decent El Nino. That would be 80-81, 03-04 and 92-93 were warm neutral so you can basically throw them out. So far if you remove the Xmas 80 cold outbreak this winter and the next 2-3 weeks look a heck of alot like 80-81. It was pretty darn cold but could not snow at all. the pattern completely broke down after 2/10 and torched. It was not a Nina pattern though, it was just basically a raging zonal one

Strangely enough Feb 81 was mostly just zonal. The entire country likely torched based on the individual day height maps I see. It seems though that more often the last 25 years however that the February pattern in La Nina winters loves to revert back to whatever the December pattern was in the GOA/AK area. It would be strange if February reverted more to 12/8 onward with the sort of too far east and large displaced Aleutian low like a strong Nino. Prior to 99 or 00 many La Nina Februarys simple went classic Nina, 89 was an exception where the pattern sort of resembled December 88 but there was a SSW I believe which made Feb/Mar 89 as cold as they were over the Plains/Lakes and at times SNE down to MA

Right now this winter is attempting to follow 80-81 which was really the last case of a cold neutral winter following a decently strong Nino. It also peaked at Nina status very late, more in Jan than the usual Oct-Dec. The snow totals were awful though and 2/10 onward was a raging torch. December by modern day warming matched decently well too in many areas, the Xmas cold outbreak skewed 80 too.

Whether thats legit or not who knows. Might once again be the model trying to default to the ENSO state

I could definitely see if the MJO gets decent amplitude through 8-1-2 that any flip takes awhile to happen and its closer to 2/10 or 2/15 before things really change. I've never liked relying on late peaking Ninos or Ninas to be able to turn the background state as well as ones which are established by October or November.

You lose the darker height anomalies from Baja up to BC over the previous few days, some of that is simply the resolution further out but seems like maybe the ridge is flattening somewhat at the end.

D16 on the 06Z GEFS looked ugly as it seemed the W Coast ridge was about to be totally punched and the flow was going to go zonal but at that range who knows. Also the patterns have been continually getting broken down too fast on ensembles for 2 months

You wonder if this winter is gonna be like 18-19 inverted. Models keep trying to show some type of more La Nina pattern beyond D10 and it never develops.

The only problem I see is the overall look has degraded in regards to storm potential. The D10-16 look now resembles more 12/1-12/7 than what it showed a few dayd back which is the classic stormier look. This now seems more cold and dry

The most shocking thing on the 12Z Ops is the CMC/GFS look nearly the same D8-10. The bad thing is it does not take an expert to see the Pac flow is still insanely fast at D10

The subsurface looks mild though, at least last I checked. would not be surprised if thats still the case if it fades fairly quick in the next 4 weeks

The La Nina is so weak and the PDO has dropped in intensity I am not so sure the idea we just go to a typical Nina late January and February pattern is going to work

The tendency since mid November has been for ensembles to be rushing changes to the pattern by 5 days or so. Remember 15 days back it was unanimous we'd torch by 12/21, instead its more 25-26 now, some of the previous changes were rushed too. Not surprised to see it be more 1/8 vs 1/2 when things really might shift

I am not sure they are able to get out there and measure if a precip change happens or the snow ends well before a measurement time. it seems they just do the standard 7am-1pm-7pm-1am measurements

Yeah much stronger La Nina though and the high latitudes were may more unfavorable that winter, we still had alot of storms though and January was very cold early. Also had a near miss in February, that winter was like 95-96 compared to winters recently

Everything amplifies now. This is why here in NY we've lost alot of those weak overrunning type storms we used to get. The waves now just become 988mb lows vs weak waves.