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


TriPol
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1 minute ago, eduggs said:

The RGEM has several hours of rain on the eastern half of LI overnight Sun - especially south shore. Anybody buy that?

No. Maybe Montauk and a tiny part of the twin forks. I’m more worried about it for the NJ coast where there’s a much longer fetch off the ocean on ENE wind. 

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2 minutes ago, ag3 said:


I’m in Whitestone and my entire yard is still covered in snow as are many areas.

We only have patches here, I'm near the Throgs Neck bridge and all throughout the town it's the same deal and Bayside as well, I was out and about most of the day. Where in Whitestone are you that you have almost full coverage? Not that I doubt you but it's pretty bare here.

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Just now, jm1220 said:

No. Maybe Montauk and a tiny part of the twin forks. I’m more worried about it for the NJ coast where there’s a much longer fetch off the ocean on ENE wind. 

Agreed. Our winds are ENE and sourced from Connecticut. Cold enough and sound is cold 

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3 minutes ago, ag3 said:


I’m in Whitestone and my entire yard is still covered in snow as are many areas.

Yep seems to be a LIE dividing zone as happens so many times. Most areas here are covered in at least some snow. I was in Long Beach on Thursday and nothing. 

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6 minutes ago, eduggs said:

The RGEM has several hours of rain on the eastern half of LI overnight Sun - especially south shore. Anybody buy that?

It's possible. Very often in storms like this models underforecast the low level cold initially, but later in the forecast period the opposite is actually true. 

I've seen the city be stuck in the 20s all day in SWFE events despite models having it higher, then jump to the 40s or even higher towards the tail end when the dry slot approaches and/or the primary cutting north and west of us.

 

With that said, the wind direction here argues against that. Maybe if coastal moves so far north that it actually bisects LI. 

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23 minutes ago, nycsnow said:

Pivotal don’t let any maps that show sleet impact snow accumulation I believe 

Yes. That's correct. From Pivotal Weather:

ECMWF, UKMET, and Environment Canada models keep track of precipitation type in a precise way as the model integrates, so we know how exactly much precipitation falls in the form of snow (at least, based on the model’s internal diagnostics). This eliminates any concern about including sleet, graupel, or rain when we compute snowfall for those models.

https://home.pivotalweather.com/guides/snowfall

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4 minutes ago, jm1220 said:

No. Maybe Montauk and a tiny part of the twin forks. I’m more worried about it for the NJ coast where there’s a much longer fetch off the ocean on ENE wind. 

I think a flip to plain rain on the NJ coast at least from Toms River area southward almost a given at this point but should see a good thump before that.

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With the 18Z models now out and generally (Euro/AIFS/RGEM/UK/CMC/HRDPS/HRRR) a bit snowier/less sleety than at 6Z and 12Z gnerally showing 8-12" before any sleet at 10:1 (which would be 10-15" at 13:1 ratios) I feel more confidence in an 8-12" snowfall for 95 from Philly to NYC and all of CNJ/EPA N of 276/195 and S of 78 (and more N of there). The two model exceptions were the NAM/GFS, which showed 5-6" (at 10:1) for CNJ (6-8" at 13:1 ratios) and then a lot of sleet (2"). I'll definitely take the Euro/AIFS/RGEM/UK/CMC/HRDPS/HRRR over NAM/GFS every day of the week (with the GFS the worst, going from most snowy to least snowy over the last 24 hours). We'll see soon I guess.

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5 minutes ago, Winterweatherlover said:

I think a flip to plain rain on the NJ coast at least from Toms River area southward almost a given at this point but should see a good thump before that.

Yep, they still get the thump to start maybe 4-6”, but the easterly fetch eventually gets temps over 32 especially near/east of the Garden State Parkway. Interior S NJ might have an icing event since I think this surface cold will be hard to dislodge. 

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1 minute ago, Winterweatherlover said:

It's knocking on the door of NYC which is where most of the forum lives lol.

And already at double digit snow by then, RAP has been solid. And the last few runs it stalls it in the spot where the run ended 

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i see zero reason to deviate from 6-10" for the city and about 8-12" here closer to 287... using mostly a RGEM/ECMWF blend with some consideration for the NAM

very strong 700mb FGEN will allow for rates up to 2"/hr for a time midday into the early-mid afternoon. should be a fun day tomorrow

rgem_temp_adv_fgen_700_neus_24.thumb.png.297361f1177e4e12af363be51528e183.png

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