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November 2025 general discussions and probable topic derailings ...


Typhoon Tip
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First inch of snow overnight, only had flurries before. Going to move up driving our field stakes for the snowmobile club by a week cause if we wait the ground is going to be frozen pretty good. First fall since 2018 we won't do it the weekend before Thanksgiving so by pure anecdotal evidence hopefully we'll have a good winter! :lol:

I'm skeptical about Sunday at lower elevation here in the valley, but up higher might do decent.

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49 minutes ago, jsw said:

Nice! I lay down to read and fell asleep before 9pm. I have seen the glowing white curtain type, but never bright colors. Thanks!

I have only ever seen Aurora twice before. Once back in the late 1980s but I was in a city and it was meh.  Then last October and it was all red but I was in a great spot   
Last night I could see the greens and reds with my naked eye pretty well. Camera brightens it a bit but still it was quite visible. 

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13 minutes ago, dendrite said:

The past 2 bigger events have been nice and visible to the naked eye here, but 2003 blows this away. It’s like comparing my 34” in 12hrs in Dec 2020 to my 34 flakes yesterday. 

Yeah 2003 was insane. I still remember the traffic jam it caused. I had no idea until I looked up from my car and was like wtf!!

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Large scale changes in the circulation mode of the Pacific are emerging in both the operational prediction methods, and experimentals. 

It is way out there in time. We won't get too crazy. That does imply standard challenges to confidence, but relative to typical predictive skill at extended leads for pattern evolution, this is above normal.  There are compelling signals nearing and post TG.   

Those go beyond just numerical indexes, too. They're related to zonal wind structural collapse at very high altitudes ( around 60 N) over Siberia, unzipping around globe toward the the Alaskan sector. That can be associated with Sudden Stratospheric Warming event.  However ... I suspect what is happening in the guidance is the other way around.  An exceptionally loud upper level ridge signal may be emerging in time. These big-time N-NE Pacific ridge blossoms can lift heights and ultimately the jet latitude S far N, forcing the mean polar vortex to 'kidney bean' around. The model zonal wind collapse is the top of ridge - think of it like a stationary cap cloud over a mountain top... it exposes how the wind bumps around the obstacle beneath quite high.   Interestingly, it can be a prelude to an SSW too - that's a longer discussion but I suspect that is worth watching for (SSW) later in December. 

Meanwhile, all three, EPS/GEFS/CEFS ensemble systems are drilling both the West Pacific and East Pacific Oscillation indexes negative on and after Thanks Giggedy.  This is also nicely painted in the spatial synoptic charts.   They are all clearly reconstructing the Pacific; there is even evidence of an HC recession, with lowering heights beneath 40 N between Japan and N of Hawaii.  That's a regression in low latitudes that would typically herald a ridge response over the NE Pacific and Alaska.  

Those latter telecons and synoptic arguments are perfectly timed.  SO, there are multiple methodology converging on a signal for Pacific changes, changes which btw are canonical preludes to continental cold loading. 

We may also have to contend ( ha, "contend" - some people want it ) with a warm up E of 100W across the continent.  The NAO probably loses the non-linear support for it's existence and starts to disappear as these aforementioned changes are emerging. 

 

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