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Discussion-OBS slippery plowable moderate to high impact snowstorm with many delays near I95 and inland btwn 10AM Sun 1/19-4AM Mon Jan 20. R/S line uncertain near and east of I95 - parts of LI may be limited snowfall of around 1"?


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Amazing consensus at 0Z for the meso/hi-res models I've seen for at least the Philly-NJ-NYC region...NWS is likely going to raise accumulations SE of 95 based on these unless we see something odd with the globals...

The NAM shows a general 4-6" event for literally everyone except 2-4" for Cape May and 6-8" for NYC and NE-ward
The NAM 3km (high res) shows a general 3-6" even everywhere except for SENJ south of Toms River, which get 1-3".
The HRRR shows a 4-6" event for almost everyone, except 2-4" for SENJ south of Toms River
The RAP shows a 4-7" event for everyone, except 2-4" for AC to Cape May.
The HRW-FV3 (will be the new NAM someday) shows a 4-7" event for everyone, except 0-4" for SENJ south of Toms River

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12 minutes ago, RU848789 said:

Amazing consensus at 0Z for the meso/hi-res models I've seen for at least the Philly-NJ-NYC region...NWS is likely going to raise accumulations SE of 95 based on these unless we see something odd with the globals...

The NAM shows a general 4-6" event for literally everyone except 2-4" for Cape May and 6-8" for NYC and NE-ward
The NAM 3km (high res) shows a general 3-6" even everywhere except for SENJ south of Toms River, which get 1-3".
The HRRR shows a 4-6" event for almost everyone, except 2-4" for SENJ south of Toms River
The RAP shows a 4-7" event for everyone, except 2-4" for AC to Cape May.
The HRW-FV3 (will be the new NAM someday) shows a 4-7" event for everyone, except 0-4" for SENJ south of Toms River

Thanks, nice write up.  These models are the ones to be focusing on at this timeframe.

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3 minutes ago, BoulderWX said:

That’s what I’m going off of. Seeing a lot of .35 - .40 QPF so I guess I’m going 10:1 but even at 12:1 that’s 5” so not far off from what I’m saying. 

Where you are the snow will stick right away and probably be powdery-although that doesn’t guarantee good ratios because you need good snow growth. There will likely be 1-2 good bands that get set up inland. The QPF IMBY might be higher but my snow will initially be paste and tougher to stack up. I’m still thinking the immediate south shore/east end might have issues getting the snow to accumulate for a while until the N wind drives the cold air down. 

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Just now, jm1220 said:

Where you are the snow will stick right away and probably be powdery-although that doesn’t guarantee good ratios because you need good snow growth. There will likely be 1-2 good bands that get set up inland. The QPF IMBY might be higher but my snow will initially be paste and tougher to stack up. I’m still thinking the immediate south shore/east end might have issues getting the snow to accumulate for a while until the N wind drives the cold air down. 

I hear ya - hoping for the best for all. Will be nice to be watching football with snow coming down. 

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51 minutes ago, RU848789 said:

Amazing consensus at 0Z for the meso/hi-res models I've seen for at least the Philly-NJ-NYC region...NWS is likely going to raise accumulations SE of 95 based on these unless we see something odd with the globals...

The NAM shows a general 4-6" event for literally everyone except 2-4" for Cape May and 6-8" for NYC and NE-ward
The NAM 3km (high res) shows a general 3-6" even everywhere except for SENJ south of Toms River, which get 1-3".
The HRRR shows a 4-6" event for almost everyone, except 2-4" for SENJ south of Toms River
The RAP shows a 4-7" event for everyone, except 2-4" for AC to Cape May.
The HRW-FV3 (will be the new NAM someday) shows a 4-7" event for everyone, except 0-4" for SENJ south of Toms River

Wow, the NWS has already bumped snowfall amounts up a bit along 95 and about 1" cross the board SE of 95 to the coast in NJ and they explain below how this is due to the early 0Z models, as discussed above.

Area Forecast Discussion
National Weather Service Mount Holly NJ
901 PM EST Sat Jan 18 2025

-- Changed Discussion --

Meanwhile near the I-95 corridor, this is where the forecast will be
the trickiest in terms of Ptype. With temperatures right around if
not just above freezing here as the precip begins, it may actually
start as rain before turning over to snow as dynamic and
evaporational cooling effects take hold. Then, as the low tracks up
the coast through the day, a mix with or change back to rain or
sleet may occur in the afternoon for a time before any mixing flips
back to snow before ending Sunday evening. A Winter Weather Advisory
was issued for this area. However, the early signals from the
00Z guidance suite tonight suggests that the amplification will
be less than previously anticipated so this would result in a
potentially weaker system, leading to more snow further south
and east. With this being said, have subtly upped forecast
numbers by about an inch or so across the coastal plain early
this evening. Considering this, may have to further expand
Winter Weather Advisories/Winter Storm Warnings further south
and east, but we`ll leave that for the mid-shift to handle in
the coming hours.

dRxCFnv.png

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15 minutes ago, Snowlover11 said:

3-6” those 8-10” amounts for western areas aren’t gunna pan out, this thing is booking and every 0z model has cut totals and is sagging SE.

Yeah having to rely on ratios isn’t gonna cut it up here. 3-5” looks to be the consensus up here now. LI up into ENE look to potentially cash in on those 6”+ amounts. If it snows in central/eastern Suffolk can almost guarantee we will be on the outside looking in. Seen this movie a few times before 

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Forgot to post this (from my FB this afternoon): Time for my guesstimate for our house in Metuchen: going with 5.1", which is a bit above the model consensus (and my NWS point-and-click forecast is 4.3"), as I'm riding the Euro AIFS. I don't do storm forecasts, since I'm not a pro and I have no mapping skills. I just comment on other people's forecasts, lol.

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18 minutes ago, MJO812 said:

Gfs now showing strong banding. Interesting to see where they set up.

Increased amounts on this run and ended up southeast of 18z.

image.thumb.png.601f55cf45e1558af09ca63876ea5a99.png

Yep, I think we get two distinctive bands with this. One situated on either side of I-95, the other just NW of US-202 and I-287. Bit of a subsidence screw zone in between the two. 

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