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Extreme Cold, Snow & Sleet: SECS 1/24 - 1/26


TriPol
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2 minutes ago, eduggs said:

The steady precip. should be done by midnight if not sooner, so theoretically there's plenty of time to clear snow and treat roads to open schools and businesses Monday morning. But just based on the hype I expect most things to be closed on Monday.

It’s supposed to be like 10 degrees again tomorrow night. And places north and west where a foot of snow or more will fall all districts will be closed 

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3 minutes ago, jm1220 said:

I’m not sure if these Pivotal 10-1 maps count sleet as snow, if not and there’s 2” more sleet, 5-6” snow would end up as 7-8” accumulation. Even with the NAM that seems to be what we’re looking at. But I agree, definitely can’t discount it. 

I don't think it does. I noticed it halts the accumulation (at least on kuchera) as soon as we flip to sleet

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Best Guess

 

Local best guess predictions, subject to change based on slight deviations in track

 

Sandy Hook 7 inches than sleet/zr

JFK 7 inches then sleet/zr

NYC 8 inches then sleet

Yonkers 10 inches then sleet

HPN 12 inches then snow/sleet mix

North shore LI- 10 inches then sleet

Poughkeepsie 18 inches, all snow

 

 

 

 

 

 

 

 

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3 minutes ago, jm1220 said:

I’m not sure if these Pivotal 10-1 maps count sleet as snow, if not and there’s 2” more sleet, 5-6” snow would end up as 7-8” accumulation. Even with the NAM that seems to be what we’re looking at. But I agree, definitely can’t discount it. 

The oddest thing about the NAM to me is it does not even have crazy rates ahead of the changeover line.  The frontogenesis is semi dislodged from the area where that would occur which may be why.  But every other model shows insane rates 2-3 hours before that change occurs...so if the NAM is wrong on that idea the changeover may be delayed

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Would you rather waste precip waiting for the column to cool enough to support snow, or to what we may be facing tomorrow evening? 
 

I most certainly rather have the snow on the ground before a possible mix, that will still be frozen. Far from ideal, but we all know that “ideal” snowstorms, especially for LI, are a rarity. 
 

We’ll all love the winter wonderland that won’t be melted away the following day, also very typical of recent winters.

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43 minutes ago, NEG NAO said:

The ice accumulation  potential and very cold temps make it  a winter storm warning

If meteorologists weren't so fixated on snow depth, but instead focused on frozen mass, 2" of sleet, alone, which is equivalent in frozen mass to 6" of 10:1 snow, would qualify for a warning.  Same impacts on transportation and shoveling/plowing, plus it melts more slowly due to the much lower surface area to volume ratio.  It doesn't have visibility issues, though, and it's not as pretty, but it's just about as impactful on the public.  

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7 minutes ago, wilton_wx said:

Thoughts on HREF?

For reference, here's the map though 1/26 0z. Typically, if one reduces the amounts by a category at this lead time, it's estimate is pretty good. As snow will continue to fall in parts of the Hudson Valley after 0z, it's current listing of 12"-15" there is reasonable. I think there will be some 18" amounts there.

image.thumb.png.f2f1f323401602906bb43b807a732471.png

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1 hour ago, wxman said:
According to Gemini (aka "ask Jeeves"):
 
In 2026, the FV3 model (specifically in its High-Resolution Window and GFS implementations) is noted for a more conservative approach to "warm noses" (elevated layers of air above freezing) compared to older models like the NAM. 
 
Warm Nose Prediction Characteristics
  • Layer Integrity: The FV3 tends to maintain colder column integrity better than the NAM. In winter weather setups, it often predicts a weaker or later-arriving warm nose, which can lead to forecasts for more persistent snow while other models might suggest an earlier transition to sleet or rain.

Thanks this is exactly what I asked about a few pages back

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1 minute ago, Rmine1 said:

Would you rather waste precip waiting for the column to cool enough to support snow, or to what we may be facing tomorrow evening? 
 

I most certainly rather have the snow on the ground before a possible mix, that will still be frozen. Far from ideal, but we all know that “ideal” snowstorms, especially for LI, are a rarity. 
 

We’ll all love the winter wonderland that won’t be melted away the following day, also very typical of recent winters.

Agree with that i'd always rather a snow to other precip scenario than the other way around near the coast.

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1 minute ago, donsutherland1 said:

For reference, here's the map though 1/26 0z. Typically, if one reduces the amounts by a category at this lead time, it's estimate is pretty good.

image.thumb.png.f2f1f323401602906bb43b807a732471.png

The NAM seems to be the only hi res model this warm (along with its replacement RRFS) so hopefully that’s a good sign. The hi res RGEM was insane at 6z. 

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