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Possible Record Breaking Cold + Snow Sunday 1/25 - Tuesday 1/27


TriPol
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1 hour ago, Winterweatherlover said:

I wonder if they expect a south tick given the highest amounts are in the southern zones?  NVM I realize this is only through 7 PM Sunday.

They generally don't like to make big changes shift to shift to avoid a windshield wiper effect. Heavier snow to the south reflects the model consensus from a day or two ago. If the further north solutions persist, future maps will gradually reflect that.

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One possible difference of note is that NWS Upton referred to NBM v.5.0 (this is the parallel version that is being tested and will be implemented during the spring) while NWS Mount Holly referenced DESI. DESI uses v4.2. The experimental version has more conservative snow-liquid ratios. 

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14 minutes ago, CPcantmeasuresnow said:

Uptons map is only through 7 PM Sunday. I'm not really sure why they would put out a map to that point in time when there may be several hours of accumulating snow still to go in many areas.

Its before the good stuff hits even.

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As strong high pressure retreats to the NE late Sat night into
Sunday, an expansive winter storm will impact the area from then
into Mon. Primary low pressure moving into the TN valley on Sunday
should dissipate while a secondary low forms near Cape Hatteras and
the VA capes, and then moves to a position just inside the 40N/70W
benchmark. Snow should begin in the NYC metro area after midnight
Sat night and spread NE to the rest of the CWA by daybreak, with
some accumulation of 1-2 inches possible by daybreak for the NYC
metro area. Heavy snow is then likely daytime Sunday into Sunday
evening via strong front-end H7-8 frontogenetic and thermal forcing
aided by an anticyclonic upper jet to the north. Given the cold air
mass in place, snow ratios look to be on the high side (15:1) at the
onset, and then settle down a little closer to 12:1 as heavier
precip arrives and the low to mid levels slowly warm.

Depending on the ultimate track of the system, it remains possible
enough warm air could intrude aloft to force a brief mix with sleet
and/or freezing rain Sunday night, especially for NYC and Long
Island. Have only mentioned a slight chance of this occurring, and
at any rate the damage will have been done well before then as far
as meeting 6+ inch snowfall amounts.

Total QPF for the event should be roughly between 1.0-1.5 inches.
Watch mentions a boilerplate 6-12 inches likely with localized
accumulations over 12 inches, but the above QPF with higher snow
ratios could yield widespread potential accumulations of over a
foot.
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18 minutes ago, kat5hurricane said:

That's very bullish. It seems like the Mt. Holly and Upton are going more aggressive in the past decade or so compared to their usual conservative nature. It's possible I suppose but 13-14+ areawide seems like a longshot IMO

 

Yeah, not buying some of the highest totals along the Jersey shore. I'm about 15 mins north of Toms River, I'm counting on mostly sleet if not pure rain after 5-7 inches. They're now casting this. Guarentee each succeeding update will show less along the shore. 

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I wonder how well sampled the northern energy is as well, that’s another important part of this equation

between the ULL off the coast of CA, the ULL over southeastern Canada, energy south of Alaska and energy currently over Russia that dives into the trough, there are a lot of players on the field

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13 minutes ago, MANDA said:

Wouldn't you think they would want it the other way?  I don't know, I would think they would lose the public's confidence by going down more so than going up.  I won't beat it to death.  

The masses are now expecting the big hyped 12-16 inch event if that fails to happen they will just shake their head at the forecasters

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 From EPAWA text alert:   SE Sussex: Winter storm Saturday night thru early Monday. Snow of at least 12 inches, then mixing with sleet; more defined amounts/timing follow Friday.NW Sussex:  Winter storm Sat night thru early Monday. Snow at least 16 inches and best chance to remain all snow; more defined amounts/timing follow Friday

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13 minutes ago, winterwarlock said:

The masses are now expecting the big hyped 12-16 inch event if that fails to happen they will just shake their head at the forecasters

Most people think 2 feet is coming because social media and Facebook weather people have been hyping it nonstop. Official forecasts don't mean much anymore

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