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January 2026 OBS and Discussion


TriPol
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11.5 degrees currently with steady light to sometimes moderate snow.  Windy as well.  Looks like Old Forge, NY out there.  Low gray overcast, deep snow cover and the air filled will falling and blowing snow.

Gotta feel sorry for anyone who has had to work outside this month.  Except for a several day pause in the cold earlier this month it has been brutal.  December was no bargain for outdoor workers either.

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Arctic air now covers the region. Highs will be mainly in the lower 20s through Friday. One or more days could see highs in the teens. The last winter with more than one high in the teens was Winter 2018-19 when there were two such days. 

Moreover, New York City has the potential to see the temperature dip into the single digits for lows on one or more days during this period. Some snow flurries or snow showers are possible Thursday night into Friday morning. 

Additional snow is possible on Sunday. However, there remains significant uncertainty about the location of the storm's development and its track. 

A large storm would be historic. For reference, New York City has seen just one 10" or above snowstorm one week or less following a 10" or above snowstorm: February 3-4, 1926 (10.4") and February 9-10, 1926 (12.4"). The shortest interval between 10" or above daily snowfalls is 14 days: March 2, 1896 (10.0") and March 16, 1896 (12.0"). Records go back to 1869.

Overall, January 20th-February 3rd will likely be the coldest and perhaps snowiest two-week period this winter. The forecast WPO-/EPO-/AO-/PNA+ pattern is typically the coldest pattern in January and among the coldest during the first half of February. A persistently positive PNA will have above climatological risk of moderate or significant snowfalls. 

For perspective, the coldest two-week period this winter prior to January 20th was January 3-16, 2026 and January 4-17, 2026 with a mean temperature of 30.3°. The snowiest two-week period was December 14-27, 2025 when 7.2" of snow fell. Already, snowfall since January 20th has surpassed that figure.

The ENSO Region 1+2 anomaly was -0.3°C and the Region 3.4 anomaly was -0.7°C for the week centered around January 14. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.48°C and the ENSO Region 3.4 anomaly has averaged -0.68°C. La Niña conditions will likely continue into at least late winter.

The SOI was -2.82 today. 

The preliminary Arctic Oscillation (AO) was -4.601 today. That is the lowest AO value since February 16, 2025 when the AO was -4.772.

Based on sensitivity analysis applied to the latest guidance, there is an implied near 100% probability that New York City will have a cooler than normal January (1991-2020 normal). January will likely finish with a mean temperature near 30.2° (3.5° below normal). 

Supplemental Information: The projected mean would be 2.4° below the 1981-2010 normal monthly value. 

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1 minute ago, psv88 said:

Well done.

very common for people to low ball Islips numbers. Coastal enhancement is real out there and it’s further north than people realize 

That was the area I was most uncertain about. I overdid the impact of the warm air aloft. Hopefully, I'll do better next time.

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1 hour ago, donsutherland1 said:

That was the area I was most uncertain about. I overdid the impact of the warm air aloft. Hopefully, I'll do better next time.

Was a very tough storm to forecast when you got into the nitty gritty and with the higher QPF than predicted. I didn’t think anyone in NYC or LI would reach 12” in this type of storm and I was wrong. It’s a humbling hobby. 

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1 hour ago, psv88 said:

Well done.

very common for people to low ball Islips numbers. Coastal enhancement is real out there and it’s further north than people realize 

Albany area really underperformed, real precip never made it north.  NWS was forecasting 18-24

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30 minutes ago, snywx said:

U were 14f colder! 
 

6 for a low here 

Perfect conditions for it. You'll see in the NW thread I post a screenshot that includes Legoland, 7 miles away as the crow flies, almost 19 degree difference. I thought I might have beat KMGJ for once but they got to -9 in between hours. When I was at -8 KMGJ was around 0. Cool stuff, only 2 miles away.  

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