December 2025 OBS and Discussion

[NorthShoreWx]

1 hour ago, donsutherland1 said:

Thank you. It seems that the formula dropped "T" rather than counting it as 0 on the spreadsheet. Mean: 3.5"; median: 2.0"

I have that problem with the excel files I maintain for my climate records.  For my monthly snowfall summary ( https://www.northshorewx.com/ClimateData/SmithtownDailySnowfall.pdf ) I have a 0 for months where there were traces so that the averages don't get messed up (excluding October and May where the average is 0). 

I keep sheets with the daily data including traces, but I can't calculate an average value for a given date (e.g., December 3) because of all the years that have a trace on that date.  As a result, the difference between the actual average seasonal snowfall and the sum of the daily averages for the season in excel is significant; 36.2" vs 41.0"

 

[coastalplainsnowman]

3 hours ago, Neblizzard said:

We may have to toss December 

Definitely.  January and the first three weeks of February as well.  Best chance right now is looking like February 22nd.  Not the morning, but the afternoon.  After that, with the sun angle there's no chance anyway.

[MANDA]

Do with it as you wish but WPC not enthused for much precip in any form over the next 7 days.

I.E. cold and dry.

That said any subtle change in the flow could allow for a northward drift in the precip shield to our south but seems a long shot attm.

[NJwx85]

What did the 12z Euro show for Friday?

[snowman19]

2 minutes ago, NJwx85 said:

What did the 12z Euro show for Friday?

Zip zero

[NJwx85]

6 minutes ago, snowman19 said:

Zip zero

What about for SE PA?

[bluewave]

23 minutes ago, snowman19 said:

Zip zero

Continuation of the Great Lakes cutter, I 78 to I-84 hugger rain-snow line, and suppressed Southern Stream storm tracks since 2018-2019. Very persistent over-amped Northern Stream of the Pacific Jet. Makes you wonder what it’s going to take to shift this pattern?

[anthonymm]

6 hours ago, forkyfork said:

too much pacific energy keeping the pna ridge flattened and ruining an otherwise great pattern 

Where have we seen the pacific ruining I95 snow chances before ? Oh wait.

[anthonymm]

6 hours ago, BxEngine said:

Hes one of the kids that posts pessimistic shit this way when it inevitably happens, he can claim victory and also be mentally prepared for the sadness that people feel when they dont get what they actually want. And if we happen to get snow they wont acknowledge the incorrect posts, just move on and enjoy their snow they wanted while being doubly excited because they were pessimistic. Freud would have a field day in this forum.   

You can claim to examine my psychology as much as you want but I'm sure you'd agree the smartest forecast one can do these days is aim low on I95 snow

[jm1220]

38 minutes ago, bluewave said:

Continuation of the Great Lakes cutter, I 78 to I-84 hugger rain-snow line, and suppressed Southern Stream storm tracks since 2018-2019. Very persistent over-amped Northern Stream of the Pacific Jet. Makes you wonder what it’s going to take to shift this pattern?

This past one at the surface had a good track but the high was booted out like no one’s business and the surface winds turned SE ahead of it at the coast. Also it was on the move so fast that the mid levels could not develop a CCB and wrap cold air in after the surface to mid levels were torched. Maybe in Feb with the coldest waters of the season and preexisting deep cold air mass this could’ve worked. 

[anthonymm]

40 minutes ago, bluewave said:

Continuation of the Great Lakes cutter, I 78 to I-84 hugger rain-snow line, and suppressed Southern Stream storm tracks since 2018-2019. Very persistent over-amped Northern Stream of the Pacific Jet. Makes you wonder what it’s going to take to shift this pattern?

Monster +PDO in a warm neutral/moderate nino. NYC's not seeing a KU till the pac jet is utterly defeated.

[Brian5671]

2 minutes ago, jm1220 said:

This past one at the surface had a good track but the high was booted out like no one’s business and the surface winds turned SE ahead of it at the coast. Also it was on the move so fast that the mid levels could not develop a CCB and wrap cold air in after the surface to mid levels were torched. Maybe in Feb with the coldest waters of the season and preexisting deep cold air mass this could’ve worked. 

A little blocking could work too to keep that high anchored in...

[Krs4Lfe]

12 minutes ago, anthonymm said:

Monster +PDO in a warm neutral/moderate nino. NYC's not seeing a KU till the pac jet is utterly defeated.

Unfortunately, that’s not going to happen until we see some sort of big-time retraction of the Pacific jet, but that would require this summer temperatures over the north Pacific to not be super warm like they have been for the past seven years which leads to this faster pacific jet along the boundary with a colder Eurasia. 

[Krs4Lfe]

2 hours ago, MANDA said:

Do with it as you wish but WPC not enthused for much precip in any form over the next 7 days.

I.E. cold and dry.

That said any subtle change in the flow could allow for a northward drift in the precip shield to our south but seems a long shot attm.

Like I’ve said in the past, it’s always good to see storms around the country in December but it seems like aside from the stormy start that just occurred. We will have the next 7 to 10 days of pretty much cold and dry over eastern and central US with nothing to show for it. Pre 2020 era, we would have ample snowstorms moving across the northern tier when you had such a cold weather pattern. But now everything ends up being suppressed and then when a storm amps up it ends up cutting or the southeast Ridge pushes it too far west for any of us to see the benefit. Welcome to the new normal.

[bluewave]

11 minutes ago, jm1220 said:

This past one at the surface had a good track but the high was booted out like no one’s business and the surface winds turned SE ahead of it at the coast. Also it was on the move so fast that the mid levels could not develop a CCB and wrap cold air in after the surface to mid levels were torched. Maybe in Feb with the coldest waters of the season and preexisting deep cold air mass this could’ve worked. 

The fast Pacific flow and lack of blocking didn’t allow the cold high to stay anchored over New England. The WAR flexed just enough so the thermal gradient got pushed north of NYC. So these features negated the usual colder influence we see with lows tracking south of Long Island. Plus the low was strung out on a N-S axis without enough deepening near the benchmark to allow the cold air to wrap in behind the storm.