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Mid to long range discussion- 2025


wncsnow
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2 hours ago, GaWx said:

12Z CMC ZR: major icestorm with 1”+ ZR ATL, Gainesville, Athens, Augusta, Columbia

IMG_1634.thumb.png.0b37b9504b3caf829913c261374f1704.png

Sleet: @dsaurgets some

IMG_1633.thumb.png.5adba97500f84f4dc980049634f98207.png

 

And there's the devil dance that comes with sleet and zr. .8 of zr is bad, bad news.  Thanks for the news, Larry, lol.  Hope it's more sleet than zr. Still plenty of time for it to go all ip, or sn.

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6 minutes ago, BooneWX said:

The footprint has improved greatly, as have the totals for the mid south. Gotta hope the latter will happen further east soon.

12Z EPS: The 2m temps (along with H5 heights) dropped noticeably vs the 0Z (this as of 1PM Fri):

IMG_1647.thumb.png.51a8f98d93abf52c037c28c812cd8771.png

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Growing cautiously optimistic someone near or north of I-85 minimum is going to get something they can enjoy. Still some finite details to work out but this is usually the type of system the Euro struggles with the most, due to tendencies on holding back energy. Next couple of runs I’m looking for the GFS to show a little earlier phasing and create a big dog!

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17 minutes ago, dsaur said:

That front running batch Fri morning is very interesting.  Could set the table for the whole event. Mostly likely ip that early as the column moistens up.

Tony, Based on looking at decades worth of old maps of 850s at the time of SE winter storms, I’ve found that the sweet spot for significant sleet is +1 to +2C at 850 mb combined with good wedging. The models that aren’t delaying the precip have in or near that sweet spot for your area for most of the storm fwiw (yes it will change but you’ve got a decent shot). Colder than that is snow and warmer than that is often ZR, especially +3C+.

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Following up on my post, the 3 major models all have the same type of “look” to them. Now it’s just a matter of how the northern stream interacts with the stj and I don’t think anyone can accurately predict that at the current moment until the models resolve somewhat. We know there are some bad habits and tendencies involved but actually predicting the timing of phasing I think is still reserved until maybe 0z or 12z Wednesday imo. 

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