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December 2025 OBS and Discussion


wdrag
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5 hours ago, North and West said:

I’ll be the hater here: Why would we have such a big snowstorm down to the shore in an early part of the season (first week of December) when we usually don’t? (I’m aware that it’s snowed during this time in the past, et. al.) The universe usually aligns against it.

Ok, I’d enjoy being wrong, but interested in knowing why it would occur. Thank you and safe travels today!


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GFS already corrected north and it's likely not done. Cimo favors the interior heavily. Catskills and Poconos should get a really nice event.

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the 12Z Ukmet lost the storm altogether far out too sea now - nothing is set in stone yet still have 2 systems to deal with previous to this one - Ukmet shoving the cold air farther south could be a signal for a  a colder scenario here next week

prateptype_ukmo-imp.conus.png

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4 minutes ago, NEG NAO said:

the 12Z Ukmet lost the storm altogether far out too sea now - nothing is set in stone yet still have 2 systems to deal with previous to this one - Ukmet shoving the cold air farther south could be a signal for a  a colder scenario here next week

prateptype_ukmo-imp.conus.png

If we have an endless stream of kicker shortwaves like last winter, suppression/OTS a definite possibility. Still way too early to nail anything down obviously. 

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3 minutes ago, jm1220 said:

If we have an endless stream of kicker shortwaves like last winter, suppression/OTS a definite possibility. Still way too early to nail anything down obviously. 

Euro is also weak and suppressed. 

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12 minutes ago, jm1220 said:

If we have an endless stream of kicker shortwaves like last winter, suppression/OTS a definite possibility. Still way too early to nail anything down obviously. 

this and the cold could overwhelm the pattern which leads to cold/dry

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20 minutes ago, NEG NAO said:

the 12Z Ukmet lost the storm altogether far out too sea now - nothing is set in stone yet still have 2 systems to deal with previous to this one - Ukmet shoving the cold air farther south could be a signal for a  a colder scenario here next week

prateptype_ukmo-imp.conus.png

ukmet is probably the worst model next to Icon?

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15 minutes ago, WeatherGeek2025 said:

ukmet is probably the worst model next to Icon?

So the Euro is worse too ? - similar solution as Ukmet - Euro Ai and Canadian - GFS basically alone as of now

prateptype_cat_ecmwf-imp.conus.png

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1 minute ago, NEG NAO said:

So the Euro is worse too ? - similar solution as Ukmet - Euro Ai and Canadian 

prateptype_cat_ecmwf-imp.conus.png

Euro AI ensembles are west of the op. I expect the ridge on the east coast to pump more due to the negative PNA.  I expect shifts west but the question becomes how much far west?

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1 minute ago, MJO812 said:

Euro AI ensembles are west of the op. I expect the ridge on the east coast to pump more due to the negative PNA.  I expect shifts west but the question becomes how much far west?

Good point

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2 minutes ago, NEG NAO said:

Good point

If we want to see snow on the coast we have to hope for the trough to pass the coast before the precip comes up so it can ride the boundary. We also have to hope that the flow slows down.

We haven't had a big phase in a long time . Can we finally have one ?

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The models continue to look cold in the long range all the way out to December 10th. At least we're looking at a cold weather pattern for the 1st half of December. That gives us a chance at seeing some early season accumulating snow at some point in early-mid December, even if it's a light event. Certainly beats a warm weather pattern. 

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4 minutes ago, winterwx21 said:

The models continue to look cold in the long range all the way out to December 10th. At least we're looking at a cold weather pattern for the 1st half of December. That gives us a chance at seeing some early season accumulating snow at some point in early-mid December, even if it's a light event. Certainly beats a warm weather pattern. 

Would rather warm if it won’t snow. Can play sports outside and not freeze, lower heating bills

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2 minutes ago, psv88 said:

Would rather warm if it won’t snow. Can play sports outside and not freeze, lower heating bills

But you need the cold air in place to have a chance at snow. I like warm weather in October and most of November, but now it's time to start rooting for colder weather for snow lovers. 

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The GFS lost the big western trof and sharpened a different shortwave in the central US in just a few cycles. This happened in the mid-range, not fantasy range. It just goes to show how variable model output can be in this range.

917529741_GFSshortwaves.thumb.gif.354e1c5d327567f8d7bf980a3a005abf.gif

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11 minutes ago, MJO812 said:

If we want to see snow on the coast we have to hope for the trough to pass the coast before the precip comes up so it can ride the boundary. We also have to hope that the flow slows down.

We haven't had a big phase in a long time . Can we finally have one ?

I would rather have the models where they are now this far out and after todays 12Z runs I think this will be snow/ice or nothing north of Philly at least - GFS is usually over amped to begin with..........

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4 minutes ago, NEG NAO said:

I would rather have the models where they are now this far out and after todays 12Z runs I think this will be snow/ice or nothing north of Philly at least - GFS is usually over amped to begin with..........

I thought the Euro is usually overamped and the gfs is too progressive.

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