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Wintry The Webber/1300m/Kylo/Jon/Whatalife Storm January 12th-14th

3km NAM at the very end of the run has some light ice forming in northern GA. The NAM and RGEM are the models of choice now that we are getting in range of them and will do the best job with the CAD.
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Keep an eye on that precip moving in off the Atlantic, DP's still in low 20's at that time....
 
NAM is still complete trash at this range. Remember when it was giving Oklahoma 10” of snow in early December only for it to vanish completely?
 
NAM is still complete trash at this range. Remember when it was giving Oklahoma 10” of snow in early December only for it to vanish completely?

It's prone to amping things a bit too much in the long range at times which is likely what happened in that system. The 3km inside 48 hours is usually pretty good and it's qpf agrees fairly well now with the globals. It's thermal profiles in CAD events are usually better handled than most globals as well. Something to watch with this system is a "precip hole" as the low transfers to the coast. The ICON is hinting at this and some other models have, could help reduce ice totals in CAD regions if that area ends up over them.
 
I heard that the 6z Euro was weak and suppressed.
Moisture over VA went poof
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Models often struggle with qpf when there is plenty of dry air around and a weak overrunning setup ahead of the main system like we have. Sometimes these overrunning bands can be much stronger than modeled. The RGEM vs 3km NAM illustrates that pretty clearly with significant qpf disagreement in the initial overrunning precip.
 
Overrunning precip is almost always undermodeled, that’s are best chance for snow in west nc
 
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People make fun of the CMC but it and the RGEM are nearly identical at hour 48 and the RGEM is a very good short range model.
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RGEM
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Here's the snow depth and ice maps from the Canadian. I "think" the snow depth map is showing snow and sleet that has accumulated since it's higher than the snow maps. The ice is definitely less on the north side compared to the last run because more sleet is involved.
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Fwiw the 12z FV3 actually shows some nice bursts of snow across parts of NC now, this aligns with what the RGEM was hinting at. RDU jackpot! It's also a good bit colder this go around. Interesting.
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Here's the snow depth and ice maps from the Canadian. I "think" the snow depth map is showing snow and sleet that has accumulated since it's higher than the snow maps. The ice is definitely less on the north side compared to the last run because more sleet is involved.
View attachment 10551
View attachment 10552
That ice map won't happen lol.

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