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December 2022


dmillz25
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1 minute ago, Allsnow said:

Thanks 

Maybe if we are lucky a big cutter before Christmas can finally pull the trough into the East. That could leave the door open later in the month for a colder storm track. But I am hesitant to buy into a significant snow threat from more than 5 days out with how the models have been in full pushback mode since late November. 

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2 hours ago, Winterweatherlover said:

I actually think this December has been better than some recent past ones. A lot of northern and western parts of this subforum have already seen 3 snow events. The snow did make it into NYC and the immediate suburbs last Sunday. I can't remember the last winter it snowed much in or near NYC before Christmas. 

This is very true. I’m at 10.6” ytd at 12/16. Not too bad at all

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The storm responsible for rain along the coast and some snow well inland will wind down tonight. So far, precipitation totals are in line with expectations. Amounts included:

Albany: 1.76" (today's 1.60" set a daily record)
Binghamton: 0.93" (7.3" of snow)
Boston: 0.87"
Bridgeport: 1.03"
New York City: 1.28"
Newark: 1.17"
Philadelphia: 2.05" (yesterday's 1.90" set a daily record)
Providence: 1.17"

In the wake of the departing storm, a cold but dry weekend will follow. Late next week could see another storm bring precipitation to the region. Model solutions range from accumulating snow in the New York City-Newark area to a potential Ohio Valley/Great Lakes blizzard. Details remain to be sorted out, but the latter scenario is currently the favored one on the ensembles. Once that storm passes, the season's coldest air so far will pour into the region.

The latest EPS weeklies continue to suggest that near normal to below normal temperatures could prevail during the December 19-26 and December 27-January 2 periods. No severe cold is likely through at least the first three weeks of December. Afterward, as the PNA goes neutral, the prospect for snowfall and more significant cold could increase.

The AO fell reached -4.000 on December 10th. Since 1950, there were 11 cases that saw the AO reach -4.000 or below during December. Mean snowfall for those cases was 9.0" (Median: 9.1"). 64% of such cases saw 6" or more of snowfall in December while 45% of such cases saw 10.0" or more snow. In contrast, during all other December cases, mean December snowfall was 3.5" (Median: 2.5"). 91% of those cases also saw a colder than normal December in the northern Middle Atlantic region. In terms of seasonal snowfall, 64% of those seasons saw 30" or more snowfall in New York City with 45% having 40" or more. Just 18% of such cases had less than 20" seasonal snowfall, both of which had less than 10" for the December-January period.

The ENSO Region 1+2 anomaly was -0.7°C and the Region 3.4 anomaly was -1.0°C for the week centered around December 7. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.23°C and the ENSO Region 3.4 anomaly has averaged -0.95°C. La Niña conditions will likely persist through mid-winter.

The SOI was +11.83 today.

The preliminary Arctic Oscillation (AO) was -2.548 today.

On December 14 the MJO was in Phase 4 at an amplitude of 0.652 (RMM). The December 13-adjusted amplitude was 0.751 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 75% probability that New York City will have a colder than normal December (1991-2020 normal). December will likely finish with a mean temperature near 37.7° (1.4° below normal).

 

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2 hours ago, SnowGoose69 said:

They don’t really break it down, there just is not much cold air but the 500mb pattern D10-16 is way better for us than the pattern now  

that's the problem it always looks good day 10-15 then it craps the bed medium term.  This ended up being one of those warm -NAO patterns.   Very similar to Dec 96....

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