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Wintry Machine Learning Mauler 1/30-2/1

Especially for Georgia, the track and tilt of the UUL as it approaches and passes through Georgia is leaps and bounds better on the AIGFS than the GFS. Small differences in this situation have an outsized impact on what happens Saturday.

Atlantans' pull for the new kid on the block, hard. Notably, throught todays runs, it has improved bit by bit to what now would be a nice event for many.



gfs_z500_vort_us_fh42-54.gifaigfs_z500_vort_us_fh42-54.gif
 
This is just a hunch but I have noticed a subtle shift West for a lot of forecasters in NC because I think they believe a slight NW trend is coming. My guess is they think the ULL is strengthening and pulling the Low off Wilmington more towards the coast. Let's see if this is just a blip at 18Z or a real thing
 
Sorry to be that guy but are there any snow total maps for the AI GFS?
Unfortunately, not on WeatherBell. I imagine you're curious about Savannah. 850s and 700s are supportive of all-snow, but it looks like BL temps up to 925mb are too warm at the start. I think it would be rain-to-snow, but it's hard to say what the breakdown between the two would be as I don't have very detailed maps.
 
Unfortunately, not on WeatherBell. I imagine you're curious about Savannah. 850s and 700s are supportive of all-snow, but it looks like BL temps up to 925mb are too warm at the start. I think it would be rain-to-snow, but it's hard to say what the breakdown between the two would be as I don't have very detailed maps.
Ah yeah that makes sense, figured that massive bump in qpf would come with a catch.
 
that is the snow growth region where flakes form.

but it's going to be so low...

like really really close to the ground compared to normal

i actually can't believe the type of airmass and precip to go with it; it's not normal ever for this south especially
 
I heard a couple of Mets mention dry air concerns in DGZ or just above. I'm too tarded to make sense of what consequences that would bring to what falls, but is this a concern for you more educated folk?
The entire atmosphere will be a dendric growth zone. It will be <-10C from the surface throughout the column. Not sure what they would be describing.
 
21z RAP is a nice jump west of last 15z extended run much improved on the F5 keep those trends up please....It was so close to really starting back in AL/GA border and filling in a slight pivot sooner and little further West

View attachment 191413
As a Columbia resident, this is the level of disappointment I’m preparing for.

Question - on one of the models earlier I saw some freezing rain or mix - do we really think that’s possible for central SC? I was expecting that temps wouldn’t be a problem for our area?
 
As a Columbia resident, this is the level of disappointment I’m preparing for.

Question - on one of the models earlier I saw some freezing rain or mix - do we really think that’s possible for central SC? I was expecting that temps wouldn’t be a problem for our area?
no

snow or rain

no inbetween

the snow growth region, when saturated to make snowflakes, will make it all snow
 
there are going to be zones of 2-4 and then zones of 8-12 all throughout

we have no way of knowing how strong the ull will be or the actual track and how far south

ull are notoriously hard to forecast and models never get it right

then you combine the coastal for eastern nc, which is a whole other set of eggs


all of the snowfall maps should just be used to see the idea of precipitation extent; not the snow amount

the GFS is still doing 25, 26:1 ratios in cae at points. that is basically stupidly unicorn type rare
 
21z RAP is a nice jump west of last 15z extended run much improved on the F5 keep those trends up please....It was so close to really starting back in AL/GA border and filling in a slight pivot sooner and little further West

View attachment 191413

Again with the snow hole right over Aiken and Augusta… what on earth is this?


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21z RAP is a nice jump west of last 15z extended run much improved on the F5 keep those trends up please....It was so close to really starting back in AL/GA border and filling in a slight pivot sooner and little further West

View attachment 191413

Does anyone have an answer to the snow hole in Aiken and Augusta on all models


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there are going to be zones of 2-4 and then zones of 8-12 all throughout

we have no way of knowing how strong the ull will be or the actual track and how far south

ull are notoriously hard to forecast and models never get it right

then you combine the coastal for eastern nc, which is a whole other set of eggs


all of the snowfall maps should just be used to see the idea of precipitation extent; not the snow amount

the GFS is still doing 25, 26:1 ratios in cae at points. that is basically stupidly unicorn type rare

The winds will also kill the ratios. Jmo 12:1 , 13:1 safe bet. Idk if I’d bet the farm on anyone knocking down 20+:1


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