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Wintry Machine Learning Mauler 1/30-2/1

Actually...that's a good point. 3km is the clear outlier, can't argue that. The FV3 is kind of the middle of the road. Let's see what the RGEM shows.
most now-casty storm i've ever seen. can't help but sit back and laugh. in order to stay sane it is imperative you maintain the same exasperated "what next" attitude clark griswold has on national lampoon's christmas vacation. at this point we just got the "bonus"
 
I would think if it makes it this far west, you'll get in that band on the way here and on the way out. Who knows, perhaps even what it's showing is underdone. 2009 keeps dancing in my head.
I try to look at which models have been the most consistent, too. Euro has jumped around more than the others. It had some of the same big totals as the GFS, ICON, Canadian and NAM, but hasn't been as consistent as those. I know people say the Euro is the king, but sometimes it looks like it just jumps around and throws different outcomes at the wall to see if one sticks and then people say it was right.
 
NWS Tampa office really going to have to address this Gulf effect snow being modeled by the 3K NAM -- 12z run shows a strip of 2 inch Kuchera accums (gulp!) from Pasco County down into Hillsborough. Would obviously be historic.
View attachment 191772
Definitely interested in this! There is a chance Tampa could set their all-time snowfall record (0.2") if the streamer sets up right! Florida doubled their all-time snowfall record with last year's Gulf Coast Blizzard, so why not?
 
most now-casty storm i've ever seen. can't help but sit back and laugh. in order to stay sane it is imperative you maintain the same exasperated "what next" attitude clark griswold has on national lampoon's christmas vacation. at this point we just got the "bonus"
Always the case with ULL

No model does it right
 
most now-casty storm i've ever seen. can't help but sit back and laugh. in order to stay sane it is imperative you maintain the same exasperated "what next" attitude clark griswold has on national lampoon's christmas vacation. at this point we just got the "bonus"
I can't remember an event within 18 hours of start that had this big a spread...the butterfly effect.
 
If i was gonna draw a map it would look like this. I think it's a little overdone with the dry slot but a dusting to an inch in that area seems plausible. We don't have to agree or like it, but history says there will be a minimum between the 2 systems.
1769783939987.png
 
most now-casty storm i've ever seen. can't help but sit back and laugh. in order to stay sane it is imperative you maintain the same exasperated "what next" attitude clark griswold has on national lampoon's christmas vacation. at this point we just got the "bonus"
It makes you wonder what the point of these last few days was, if it's <24 hours before it starts and I might know less than ever about what's going to happen. I guess I could default to "trust the experts" and NWS RAH's 4-7" Winter Storm Warning for here, and honestly that seems like a pretty reasonable prediction at this point.
 
12z NAM just looking better and better with the ULL -- don't know how it will translate, but it's deeper and better tilted vs. 6z and 0z at 30 hours.
Yeah I noticed that. That is a trend we need to see heading toward home.
 
I noticed the low popping off the SC coast as well. Thinking the ULL drove a little further south, causing the atlantic low to pop further south. Thoughts?
Using what I saw last night in a tweet from ContentWXGuy I thought I'd take a stab and seeing where the upper air players are at currently. This is what I'm thinking it's at rn lmk if this is wrong. SW1 is lead shortwave and 2 is the main Shortwave
645595046a11e196bc2babb67c7a64a0.jpg


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It makes you wonder what the point of these last few days was, if it's <24 hours before it starts and I might know less than ever about what's going to happen. I guess I could default to "trust the experts" and NWS RAH's 4-7" Winter Storm Warning for here, and honestly that seems like a pretty reasonable prediction at this point.
I think 6 to 8 is reasonable now looking at all the data, and could end up more. Maybe the model showing the least amount ends up right and it is a lot less, but that would be ignoring all the other models and totals, and just going with the least amount for the sake of going with the least amount.
 
As several have mentioned, the tilt has everything to do with the amount of moisture. The big runs we've seen, we were able to get to neutral or slightly negative. If that tilt stays more positive, then you get the lesser amounts with a dry slot somewhere. Right now it looks like it'd be somewhere close to RDU. Could be a little west or east.
 
12z 3km Roofus versus NAM couldn’t be more different in the existence and placement of the elevated warm front -

RRFS -
View attachment 191778

NAM -

View attachment 191779
This is pseudo-wishcasting, but if we go with the assumption that warm noses will always overperform, then it kind of follows that we could expect the warm front to be on the northern side of guidance (or even further north). Of course, that doesn't always happen and may not here.
 
As several have mentioned, the tilt has everything to do with the amount of moisture. The big runs we've seen, we were able to get to neutral or slightly negative. If that tilt stays more positive, then you get the lesser amounts with a dry slot somewhere. Right now it looks like it'd be somewhere close to RDU. Could be a little west or east.
I actually completely disagree. It's all about whether the coastal low tracks along the gulf stream or not. 12z 3km NAM had better tilt at H5 and much drier outcome over central NC because it placed the coastal low further offshore.

e78c08ec-8325-4e53-9caf-5804bde946af.gif
 
I actually completely disagree. It's all about whether the coastal low tracks along the gulf stream or not. 12z 3km NAM had better tilt at H5 and much drier outcome over central NC because it placed the coastal low further offshore.

View attachment 191781
you and i have been lockstep in this detail. totally agree.
 
View attachment 191754
It will be interesting to see if the 3K is drying out the backside a little too fast. Some of the globals keep the snow going into the night even in the upstate. Either way there's a swath of 0.5"+ QPF in the upstate now
Hopefully its wrong but prob not. As it transfers or pulls out the side will get dry slotted pretty fast. But if it slows just off the coast it would likely be enhanced instead....stay tuned
 
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