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Wintry January 21-23 2025

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Tail end of the precip shield over the Gulf shifting north


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Man going into the big weekend fun times... It legit feels like at moment a 1/3 chance of any of these scenarios

-True coastal slider
-Southern Track miller A * with more expansive qpf on NW side then modeled and mixing issues south
- A legit big dog event
 
Can someone explain why the GFS is made out to be more important than the GEFS in some cases? Because I would think an ensemble blend would give the most accurate forecast.
 
Saw the 850mb trend first before the QPF and saw much more WAA this run, thought it would translate to more QPF but it didn’t. Weird
Because the strongest FGEN continues to remain along the coastal Plain with a strip developing in Eastern Half of NC.

The ZR depiction in the Carolinas Coastal Plain argues more sleet than ZR based on soundings before clicking back to snow.

gfs_temp_adv_fgen_850_us_fh102-114.gif

Also the N/S Has been trending slower the last 3 cycles...
gfs_z500_mslp_us_fh108_trend.gif
 
Can someone explain why the GFS is made out to be more important than the GEFS in some cases? Because I would think an ensemble blend would give the most accurate forecast.
You still want to be paying more attention to ensemble products at this range. One deterministic model output at this range is a very long dart throw.
 
This gets even more vexing assuming the euro/AI don’t make any moves toward this gfs/cmc sort of solution. We could be actually going further from a consensus 4 days out if they hold fast
 
Would we be more short range though at this point?

Edit: Someone answered above
You’re going to start getting more into their wheel house by tomorrow evening into Sunday. Right now it’s good to look at theM at 500mb to see which side of the operational camp they’re likely too lean into and give those a bit more credence potentially
 
Would we be more short range though at this point?

Edit: Someone answered above
To put it simple and maybe this helps but when I’m watching ensembles at this range I start to pay attention to the gradient. When you have the broad color gradient over your house it’s usually a pretty good sign but when they begin to sharpen up and fall off I find I’m on the wrong side of the fun more times than not
 
Without looking at anything else One would think the northwest portion of this precip shield should produce quite well with a radar presentation like that.
GFS has taken the sleet line all the way to I-20 today
Not sure if there is a connection but the gfs is also noticeably warmer with surface temps from Monday afternoon on. It's a good 5 or 6 degrees warmer than even the usually warmer euro. Only the uk is similar. With thickening cloud cover it has my local getting to 38 tue...which is 8 degrees warmer than the euro. This seems unlikely.
 
I kind of thought that would have been a bigger run...🤷‍♂️

View attachment 164726
Upstream kicker coming in hot.

When the trough finally decides to pick up that southern wave, she's gonna blow.

Either way, it's still too low on QPF. Man, I ❤️ the GFS.
 
To put it simple and maybe this helps but when I’m watching ensembles at this range I start to pay attention to the gradient. When you have the broad color gradient over your house it’s usually a pretty good sign but when they begin to sharpen up and fall off I find I’m on the wrong side of the fun more times than not
Screenshot 2025-01-17 at 5.24.46 PM.png
Thats kinda what I figured, so I was feeling pretty great at the 12z GEFS at least. Thanks for the insight!
 
Without looking at anything else One would think the northwest portion of this precip shield should produce quite well with a radar presentation like that.

Not sure if there is a connection but the gfs is also noticeably warmer with surface temps from Monday afternoon on. It's a good 5 or 6 degrees warmer than even the usually warmer euro. Only the uk is similar. With thickening cloud cover it has my local getting to 38 tue...which is 8 degrees warmer than the euro. This seems unlikely.
Just to precipice on this, the GFS busted horribly on last Friday's event by a good 6 to 8 degrees for daytime Temps. It did well early Sat AM with the swinging gate warm front in Charleston shooting the Temps into the mid 50s... but during the event even with in-situ cold air, the GFS whiffed by a good margin. I suspect with many areas with dewpoints in the single digits and even below zero, it'll do the same in many locations garnering widespread precipitation.
 
Wouldn’t be sweating QPF too much either way at this stage. Just get the players on the field, then QPF will adjust in the last couple days. With the last storm it seemed to uptick in the run up to verification, so we’ll be hoping to see that again with any potential storm.

I personally feel good about a storm, but it wouldn’t shock me if it’s more of a coastal plain type storm that literally leaves a lot of high and dry. But I think there’s a good shot it comes N/W or at least the precip field is more expansive in that direction.
 
Upstream kicker coming in hot.

When the trough finally decides to pick up that southern wave, she's gonna blow.

Either way, it's still too low on QPF. Man, I ❤️ the GFS.

Agree the models almost always understate the NW precip shield in these setups in this range and always trend more expansive down the stretch. The best part is keeping the low placement and track the same locking in the cold...slowing it down wouldnt hurt my feelings either.

gfs_mslp_pcpn_frzn_seus_fh108_trend.gif
 
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