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December Medium/Long Range Discussion


yoda
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Looking thru a few of the maps and saw the 18z NAM. Obviously it's the 84hr NAM (lol), but what it shows is what we need to happen. That HP is stronger and more south than what other models have such that if it were to be extrapolated I would guess that at the very, very least DC and points north would stay frozen the whole event. 

Screenshot 2025-12-22 at 5.06.55 PM.png

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17 minutes ago, bncho said:

Looking thru a few of the maps and saw the 18z NAM. Obviously it's the 84hr NAM (lol), but what it shows is what we need to happen. That HP is stronger and more south than what other models have such that if it were to be extrapolated I would guess that at the very, very least DC and points north would stay frozen the whole event. 

Screenshot 2025-12-22 at 5.06.55 PM.png

18z Gfs has the 546 height line through northern Baltimore City while the Nam has it just south of DCA. IF the Nam is closer to correct with the cold air draining further south, that's enough to make a difference for some.

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3 minutes ago, mitchnick said:

18z Gfs has the 546 height line through northern Baltimore City while the Nam has it just south of DCA. IF the Nam is closer to correct with the cold air draining further south, that's enough to make a difference for some.

It's 100% a colder look. There's also more confluence. That 546 line shifting 50 miles south could be the difference between sleet/zr/rain and sleet/snow in DC.

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GFS would at least give the ski resorts opportunities next week to make snow with favorable upslope conditions too (blah blah OP run, I know).  Good timing given Christmas and New Year crowds.  

Given where some thought we were heading for end of the month, it doesn't seem like we're going to be staring at days and days of warm temps.

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1 minute ago, bncho said:

It's 100% a colder look. There's also more confluence. That 546 line shifting 50 miles south could be the difference between sleet/zr/rain and sleet/snow in DC.

Gfs 850's on top and Nam below. Notice wind direction too.

850th.us_ma (3).png

850th.us_ma (4).png

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3 minutes ago, Ji said:


We’re is it going lol. Don’t we have a 50 50 low?

I think the problem is the storm itself is mainly just slower so the high isn’t as ideally placed by the time it arrives. You can see the progression of the storm slowing down run to run on the GEFS member MSLP graphic

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4 minutes ago, stormy said:

Remember this.............. Persistence can be a very good thing.

How many times has a threat looked good on one run and been gone the next run??

It looks good for @mitchnickand points north, and has been like that for the past 3 model runs (not just the GFS) IMO.

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