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December 14-15 Winter Storm Part Two


earthlight

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GFS looks like a complete torch at 54 hours. 850mb low does not redevelop and the sfc low hugs the coast. 

 

Not a great run at all. Front end snow, then plain rain for many. 

That's why if anyone wants all or mostly snow, we need a weaker storm off the coast. Or one that redevelops far enough south to close off an 850mb low and stop the deluge of warm air. It would be a fun few hours on this run but eventually rain for most.

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gfs_t2m_east_19.png

This is the warmest the surface gets - as the 850`s push thru the area at 51 hours the surface WARMS TO 40  from Long Island into the city then to the NJTP and points south along the coast it rains but not before theres

accumulating snow .West of that the precip stays frozen .  fwiw   hr 54 is colder as is hr 66 as the surface s come crashing down as the low heads ENE .By that time the best dynamics are leaving  

so don't think warap around .

This is not a torch for anyone but the coast , so be specific this board covers a lot of people .

Theres  prob 2- 4 inches of snow in NYC before the change and prob 6 just west of the city and the gradient will look good as it can be 40 at NEWARK with rain but in the Teens in NWNJ with S plus  .

This is not a bad solution  and has been well modeled . ( NAM not included )  There is very good agreement that the warm air makes through the coastal plain  before the height of the precip .

If you are looking for a magic run , it may not appear for you .  its December , and for some this is the 3rd snowfall inside 7 days before Dec 15th , That doesn't happen very often

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gfs_t2m_east_19.png

This is the warmest the surface gets - as the 850`s push thru the area at 51 hours the surface WARMS TO 40  from Long Island into the city then to the NJTP and points south along the coast it rains but not before theres

accumulating snow .West of that the precip stays frozen .  fwiw   hr 54 is colder as is hr 66 as the surface s come crashing down as the low heads ENE .By that time the best dynamics are leaving  

so don't think warap around .

This is not a torch for anyone but the coast , so be specific this board covers a lot of people .

Theres  prob 2- 4 inches of snow in NYC before the change and prob 6 just west of the city and the gradient will look good as it can be 40 at NEWARK with rain but in the Teens in NWNJ with S plus  .

This is not a bad solution  and has been well modeled . ( NAM not included )  There is very good agreement that the warm air makes through the coastal plain  before the height of the precip .

If you are looking for a magic run , it may not appear for you .  its December , and for some this is the 3rd snowfall inside 7 days before Dec 15th , That doesn't happen very often

FWIW, that temperature contrast from 19 in Southern NY to the 70's a bit off shore is a cool shot!

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Nick Gregory had the immediate NYC/NE NJ area (including Middlesex County, north of the Raritan and including western Nassau in his 3-5" band, with 5-8" to the N/W of about the 78/287 intersection and to the north of 80, in general.  Lee Goldberg had a similar map with the NYC metro section in a 2-5" swath with 5-8" N/W of there - he had a steeper gradient to <1" of snow, though, along the Monmouth coast and even the south shore of LI east of Nassau, if I recall correctly.  Will be interesting to see if the Euro is somewhere between the GFS and NAM or more like one of the other - or completely different, lol.  Still a lot can change 2 days out, especially for such a borderline situation, where a track change of 25-50 miles could make a huge difference in temps and the rain/snow line.  Strap in folks.

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I like this run. Should have been colder due to the high being in a better spot on this run

What do you mean should have been? Why should have it been colder? It shouldn't have to do anything. It's weather forecasting, just because it doesn't show a blizzard doesn't mean it's wrong. Post like this have been happening all week long and it's hard, especially for new people on here to get a grasp on how weather forecasting actually works. Too many people throwing snow bias into the forum. Don't get me wrong, I love the snow, but if a run shows less snow or warmer temps half the board wants to jump off a bridge

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