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Pattern December Doldrums 2025 🎄 ❄️

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18z GFS was the best op run I’ve seen in days for the Christmas period. Had been consistently showing mid to upper 70s for Christmas.

Not so fast on the Torchmas
 
It’s not the GFS it’s the newly rolled out AI-GFS, and never said I believed it. But the AI-EC has the same exact thing with rain and a wedge in the 40s so I guess it’s not impossible
CAD usually shows up in the shorter range on the trad models so it's possible AI is learning?
 
Some light at the end of the tunnel?
Nice to finally see some slightly positive trends at the end of the model runs now anyways.
Maybe we will have a window around the first week of January.

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Based on the instability of the models much earlier (like as early as 6 days out), I’m not so sure there isn’t at least a faint light well inside the tunnel. Something to monitor.
 
Bad news is despite the -NAO, I don’t know when or how we’re going to get rid of this Aleutian ridge.

The reason it’s so persistent is we’re seeing a tug-of-war here between some competing forces.

One of those being the tropical +AAMa that developed during the last MJO event which is trying to kick it east (red first image over the west pacific) vs persistent negative E Asia Mtn Torque (2nd image) & planetary vorticity advection trying to kick it west. These forces are largely offsetting each other, so we end up with a stationary wave pattern.

Our best chance to dislodge it might be to reignite the tropical west pac convection and advect it a bit further east into the Gulf of Alaska. Still many weeks off from that

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Based on the instability of the models much earlier (like as early as 6 days out), I’m not so sure there isn’t at least a faint light well inside the tunnel. Something to monitor.
Yea the 00z Euro ext. ensemble control from yesterday cooked up something big at hr 360. It's a long shot, but can't rule it out yet.
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Ben Crosby kind of a.m. as another caked on mega frost has made an appearance.
Short term, will the winds be calm sunday night? If its a clear, calm ,max radiational cooling night. Some of the country folk could get a 9 degree reading.
I had trouble with pivital, but euro looked like it sent a gusty line of heavy storms from west to east next Friday. We could use something that can generate more than a tenth of an inch qpf. Thats one thing a 50/50 low would do. Is finally slow up this fast flow an perhaps allow one of the ns vorts to dig an amplify for a change. But thats still 10 days out. But good news, signal is consistently shiwing on all models. Golf course is closed christmas eve an day anyway. So bring a cad storm on
 
Ben Crosby kind of a.m. as another caked on mega frost has made an appearance.
Short term, will the winds be calm sunday night? If its a clear, calm ,max radiational cooling night. Some of the country folk could get a 9 degree reading.
I had trouble with pivital, but euro looked like it sent a gusty line of heavy storms from west to east next Friday. We could use something that can generate more than a tenth of an inch qpf. Thats one thing a 50/50 low would do. Is finally slow up this fast flow a perhaps allow one of the ns vorts to dig an amplify for a change. But thats still 10 days out. But good news, signal is consistently shiwing on all models. Golf course is closed christmas eve a day anyway. So bring a cad storm on
If EC is to be believed it should be pretty darn calm in the foothills. I am always a skeptic of the big cold nights and think further east country spots won’t be able to get below maybe 13-15Fat best. Up in Dobson or the likes I could see a 9-12F
 
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