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Jan 20/21 Snow Threat


snowNH

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I really like the cold thicknesses on Saturday nosing south... should produce an overperforming thump of warm advection snows. Also good dendritic growth I think with relatively cold mid levels.

Yep, and some decent deformation and weak stability it seems too. Trying to stress for people not to pay attention to the QPF, because there will e a lot of lighter snows well north.

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Yep, and some decent deformation and weak stability it seems too. Trying to stress for people not to pay attention to the QPF, because there will e a lot of lighter snows well north.

Yeah I like what I'm seeing for Saturday. It's not going to be a big storm but the signs for a good thump are there.

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I like how on the 18z runs the shortwave was a bit more defined in one piece when ejected into northern plains. The 18z NAM was healthiest looking with it which isn't a surprise given it furthest north...you can see it in south dakota at 24h and Iowa at 30 hours...compare it to some of the suppressed guidance and you can see how its different. It increases frontogensis and taps slightly into southern moisture better....but its a fine line. If you juice that s/w up too much then we introduce ptype issues into many areas....but obviously if you keep it almost undefined, then you end up with a weak band of 2-4" as the max with 1-3" of fluff north of that.

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I like how on the 18z runs the shortwave was a bit more defined in one piece when ejected into northern plains. The 18z NAM was healthiest looking with it which isn't a surprise given it furthest north...you can see it in south dakota at 24h and Iowa at 30 hours...compare it to some of the suppressed guidance and you can see how its different. It increases frontogensis and taps slightly into southern moisture better....but its a fine line. If you juice that s/w up too much then we introduce ptype issues into many areas....but obviously if you keep it almost undefined, then you end up with a weak band of 2-4" as the max with 1-3" of fluff north of that.

Hell I'll take 2" of snow and pingers and ZR at this point lol.

Something to talk about. Looks cold at the sfc. This is Ginx sneaky LL cold lol.

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SREFs looked like they may have ticked south just a bit at 21z.

There's still the NCEP page but no sref probs until tomorrow.... :(

Some SREF products are not updating due to a hardware failure on the machine that does the bulk of the SREF product processing for the e-Wall. We are working to resolve the problems and hope to have full functionality restored by sometime on Friday, January 20. Thanks for your patience.

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Nam is nice to me. I'll take that setup any day of the week. I'm expecting 3-5/6.

Yeah probably 0.30 from BOS to ORH...but as Scott said, people need to not get obsessed with the qpf fetish...there's actually a pretty decent signal for a weenie frontogenesis band coupled with a hint of lower stability in that zone...and as often is the case, we'll prob see models bump the qpf north a bit as they get closer and recognize the dynamic there....assuming other stuff doesn't trend negative.

The key is where the dynamics are focused...the weaker/more sheared shortwave focuses the dynamics in a weaker fashion further SE.

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Yeah probably 0.30 from BOS to ORH...but as Scott said, people need to not get obsessed with the qpf fetish...there's actually a pretty decent signal for a weenie frontogenesis band coupled with a hint of lower stability in that zone...and as often is the case, we'll prob see models bump the qpf north a bit as they get closer and recognize the dynamic there....assuming other stuff doesn't trend negative.

The key is where the dynamics are focused...the weaker/more sheared shortwave focuses the dynamics in a weaker fashion further SE.

Yea, as long as the SW remains decent, then I may end up in one of the better bands up here.....but if it *hits the bed, then all bets are off.

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