December 2025 OBS and Discussion

[MJO812]

[SnoSki14]

1 hour ago, MJO812 said:

Probably more likely than normal that we see some snow. Very volatile weather pattern though 

[MJO812]

7 minutes ago, SnoSki14 said:

Probably more likely than normal that we see some snow. Very volatile weather pattern though 

Hopefully 

[MJO812]

5 hours ago, eduggs said:

This is the kind of storm that I can imagine looking borderline for snow right down to the Bronx until the NAM sends the vortmax to Buffalo and torches 900mb to 8C... signaling the rest of guidance to rain to Albany.

That said, synoptically, right now as modeled, it's pretty close for snow even in the City itself. The ICON and GFS have shifted slightly colder/south at 12z and 6z respectively, and ensembles (if you believe they are useful at this range) are south of their parent operational runs. The antecedent cold is marginally supportive. It wouldn't take a huge change in the shortwave structure aloft to lead to a snowier outcome further south.

It's not what I would bet on, but there is still some reasonable chance... especially outside of concrete jungles.

Icon getting interesting for the coast

[ag3]

36 minutes ago, MJO812 said:

Icon getting interesting for the coast

It’s a raging rainstorm well north and west of NYC and into New England.

 

 

[sussexcountyobs]

14 minutes ago, ag3 said:

It’s a raging rainstorm well north and west of NYC and into New England.

 

 

That's funny. All my local forecasts for amounts, which, granted, is WAY to early to put out amounts. Is over 6". My point is. Where do you get this amazing info? Seeing a raging rainstorm well N&W of  NYC, and into New England? Please elaborate your brilliance in weather forecasting.

[qg_omega]

1 hour ago, MJO812 said:

Icon getting interesting for the coast

What?

[Stormlover74]

43 minutes ago, sussexcountyobs said:

That's funny. All my local forecasts for amounts, which, granted, is WAY to early to put out amounts. Is over 6". My point is. Where do you get this amazing info? Seeing a raging rainstorm well N&W of  NYC, and into New England? Please elaborate your brilliance in weather forecasting.

Not sure because his response was to the 18z icon which doesn't show that at all. Now the gfs is another story

[MJO812]

December is still looking good with possible multiple threats.

[Snowlover11]

12 minutes ago, MJO812 said:

December is still looking good with possible multiple threats.

10 day always looks good

[MJO812]

1 minute ago, Snowlover11 said:

10 day always looks good

Pattern is looking good in December. Should be a good month. 

Threats are already showing up 

[bluewave]

Looks like a split decision showing up for the first week of December. Long range models shifted colder with the trough into the East instead of the ridge from previous runs. But the large storm on the 2nd and 3rd shifted warmer with a further north track.

Main issue with the storm is the very fast flow and lack of blocking allowed the high over New England to move off the coast. So the further north storm and slightly stronger WAR on the day of the storm pushed the rain to snow gradient just to the north and west of NYC.

Since the colder start to December is a new pattern not showing up until day 6-10, it’s uncertain how the current day 11-15 will actually play out. If you look back on our recent Decembers, they have a tendency to start out cold from the 1st through 15th. Then we get the warm up every year since 2011 between the 17th and 25th.

So it will be interesting to see how things actually play out vs what the models are currently showing. We would want to eventually see a colder storm for our area while we still have the cold. This is very important during La Nina’s since we need to get over 4” of snow in December to match the above vs below seasonal snowfall that I outlined a few days back in this thread. 

So hopefully we can connect with at least one storm next few weeks while the colder start is still nearby.

New early December pattern colder than old runs

Old run too warm for early December

 

New run warmer storm further north on the 2nd and 3rd

 

Old run storm track colder to the south and more suppressed