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Fall 2025 WX Discussion Thread


Carvers Gap
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Icon and euro both really dig the trough and give some nice NW snow to the region.  Euro breaks containment with trailing snow showers across NC too. 
 

IMG_4147.thumb.png.b901fb8034171a130a696fcdc71bc38e.png

 

this is random but does anyone remember the November 1,2014 storm? Was it a monster ULL?  Someone here showed me a Facebook memory and it looked like Erwin got smoked especially considering it was so early in the season.

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2 hours ago, fountainguy97 said:

Icon and euro both really dig the trough and give some nice NW snow to the region.  Euro breaks containment with trailing snow showers across NC too. 
 

IMG_4147.thumb.png.b901fb8034171a130a696fcdc71bc38e.png

 

this is random but does anyone remember the November 1,2014 storm? Was it a monster ULL?  Someone here showed me a Facebook memory and it looked like Erwin got smoked especially considering it was so early in the season.

https://www.washingtonpost.com/news/capital-weather-gang/wp/2014/11/01/incredible-early-season-snow-slams-the-southeast-impacts-felt-across-eastern-u-s/

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2 hours ago, fountainguy97 said:

Icon and euro both really dig the trough and give some nice NW snow to the region.  Euro breaks containment with trailing snow showers across NC too. 
 

IMG_4147.thumb.png.b901fb8034171a130a696fcdc71bc38e.png

 

this is random but does anyone remember the November 1,2014 storm? Was it a monster ULL?  Someone here showed me a Facebook memory and it looked like Erwin got smoked especially considering it was so early in the season.

Here are our threads:

 

 

Tennessee fans had trouble getting to the game in South Carolina.  This was part of a string of early season snows around that time frame.  Pretty sure we were the bullseye, and it shifts SE.  There are some good maps and discussion in our threads.  The Capitol Weather Gang has some maps as well.   Indeed, there are some photos of Erwin in our observations thread.  Crazy storm.

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Fountain, if you go to the Oct 24th or 25th(2014 thread above) post by @tnweathernut, there is some good discussion by John, 1234, and tnweathernut.  I have no idea what I was doing during that timeframe!  I didn't post until a bit closer to the event which is unusual.  Anyway, 1234 posted some maps of the event from about a week out.  That was a fun one to track.  Pretty sure there was snow in the Williams-Bryce Stadium stands in Columbia, SC, for that game.  

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Looks to me like the GFS and CMC at 12z are quicker w/ the energy over the GL.  The Euro slows it down and drops it into the backside of the trough.  That might be an error by that model as it tends to hold energy back. I'd feel better if the GFS had it.  I need to check the ensembles.  But...if that were legit, that is a lot of energy to crank to our SE.  The sigma maps on Weatherbell are impressive at 500 for the Euro operational.

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Noticeable trend southward on 12z ensembles.  Something to watch, but it is a great example of why looking at 500 maps tells the story.  IF(stress IF) that holds, somebody would likely get hammered by that.  Definitely will be watching this for a few days.  Huge grains of salt as climatology really doesn't support snow this early, but Fountain mentioned a great example above of this actually occurring.  It is uncanny how close those maps look.  I will be interested to see the trends.  Also interesting, 2014-15 turned out to be a great winter.  I bet the QBO dipped around then off the top of my head.

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MRX from this afternoon....

Ridging builds back in Thursday afternoon with warmer temperatures
and quasi-zonal flow in the mid and upper levels of the atmosphere..
A more progressive trough will approach the Mississippi Valley by
late Friday with an associated surface low pressure near the Great
Lakes. A cold front will move eastward across the forecast area
Friday night into Saturday morning with widespread showers and
thunderstorms expected.

A few rounds of shortwaves will strengthen the upper-level trough
across the region Sunday night into Monday. Deterministic and
ensemble members are in good agreement even this far out from the
weekend. The LREF indicates about a 70+ percent chances of
temperatures less than 32 degrees across the valley next Monday
night, which is a fairly strong signal this far out for a widespread
freeze. With northwest orographic flow and 850mb temperatures below
0C, some light snowfall will be possible for higher elevations above
4000 ft across the mountains. A significant return of cold air
appears likely early to mid next week bringing an early taste of
winter.
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The 18z GEFS 500 sigma has it yet again, and is now stronger.  Something to watch.  I have prob posted too much about it, but these types of systems can be potentially fun to track.  Need to get inside of four days to really get a good feel for this.  Sometimes northern stream energy will trend northward over time, and the phase is missed.  Right now, we want the trend on the GFS operational to be slower and a bit deeper.  The GFS being too fast is a bias just as much as the Euro being too slow.  

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