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Wintry January 21-23 2025

In summary...we've lost the UK, ICON, AI and the Euro is confined to extreme coastal sections...we are day 4 out. Not what we needed with Euro/AI being in it's wheelhouse at this range.
If we consistently see the AI suck for a couple of runs then we got issues, but it seems like it made a adjustment at H5 again so it’s not settled yet, same with the EC Gcast.
 
12z AI almost a complete whiff....with Euro confined to the coastal sections...and being day 4 out...I think we know what happens.

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Not to disparage the AI it did a good job last storm BUT it has been waffling this system a decent bit on upper air features and QPF details not having a solid runs to runs so who knows it's relatively new so lots to learn about it's behaviors
 
If we consistently see the AI suck for a couple of runs then we got issues, but it seems like it made a adjustment at H5 again so it’s not settled yet, same with the EC Gcast.
We are at day 4 for the Op Euro...that's tough to overcome. But like the rest...I will watch the models come in and hope the next 24-36 hours.
 
Not to disparage the AI it did a good job last storm BUT it has been waffling this system a decent bit on upper air features and QPF details not having a solid runs to runs so who knows it's relatively new so lots to learn about it's behaviors
If it showed a hit would you be saying this?
 
We are at day 4 for the Op Euro...that's tough to overcome. But like the rest...I will watch the models come in and hope the next 24-36 hours.
The Op Euro 5h evolution isn't awful though. We just need it to be under modeling the qpf on the back edge, which is something it pretty much always does at this lead time.
 
Punting a storm 4-5 days out when several major models show big storms is puzzling to me. I’m not saying things look like we’re definitely getting snow or anything but to punt is ridiculous. Of course, people can say they’re punting and then be back here in a day or two if things trend more towards the CMC/GFS/etc.
 
If it showed a hit would you be saying this?
Yes, been thru the growing pains of putting all peanuts in run to run OPs runs etc a long time ago but watching ensembles and consistency matter more so then anything during the leadup on last system AI it gets credit mainly because it was pretty stable on that setup and type of event and sorta stuck the same idea the whole time not because it verified after the fact well. It's a different setup so hard to know if it will handle it as well and especially since it has had some variations this time around. The Ensembles for the GFS/Euro still show more hits and upticks on QPF inland so I think that's just as crucial if not more then OP runs
 
From what I saw the main reason it did well was it was a lock. As ridiculous as this sounds the CMC being more of a lock and models going towards it makes me say we lean more towards that solution this time.
I don’t think it’s completely ridiculous to think that. I mentioned this earlier but the CMC has a history of performing very well in southeast winter storm when there is a well established Arctic airmass locked in place ahead of it. January 1988 and January 2011 are both good examples
 
General Model Themes:

ICON/UKMet - detaches the NStream a bit and kind of squashes the SW wave / makes it too positive tilt
GFS/Euro - keeps the NStream and SW wave mostly intact, but doesn't sharpen it at the base as it moves east
CMC - same as GFS/Euro, but sharpens the wave at the base as it moves east
AI (Euro & GFS) - it detaches the SW wave like ICON/UKMet, but keeps the wave fairly strong so it still produces a storm, but a day later

The AI bunch is what keeps us (me anyway) from forming a general forecast idea. The worst case scenario is the middle ground where the AI bunch trends toward detaching the SW wave less and falls into the ICON/UKMet group....while the GFS/Euro trend toward detaching the SW wave more, falling into the ICON/UKMet group as well.

That's what's bugging me at the moment
So right now we have the 3 camps as:

AI / UKMet / Icon
GFS / Euro
CMC / JMA

Personally, I'm OK with what the AI did. The middle ground right now is really the GFS / Euro which moreso matches what I have as a forecast idea, BUT with it trending more NW over the next few days with the NAM & RGEM kicking in with a bit more ridging / moisture / warmth coming out of the subtropics from Northern Mexico into the SE as the storm approaches.

Key going forward is for the GFS/Euro/CMC/JMA not trending flatter (though flatter may help areas to the south temperature wise)
 
idk this still looks like a foot for wilmington (30 mm)
Still showing small background improvements too. its not like this is tomm or Sunday ... I mean literally 5 days away. Plus all jokes aside, small improvement each run on H5 ect will eventually add up. Just keep getting first downs and eventually we will chip away and see what happens
 
We are at day 4 for the Op Euro...that's tough to overcome. But like the rest...I will watch the models come in and hope the next 24-36 hours.
It’ll be interesting to see which camp wins with the storm in the NE. The Rgem/GFS camp is amped while Euro is much further east, and this is less than 72 hours out.


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