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Moderate Snow Potential 4/4


ORH_wxman

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We are now getting inside of 4 days for this thread and guidance has been remarkably consistent on a wave developing along the thermal boundary that is left behind the arctic cold front this weekend.

 

The dynamics are not exceptional in this in terms of mid-level centers but there is some solid ML fronto and a slight bit of inflow from the south.

 

Here is the 00z Euro plot....

 

f96.gif

 

 

 

 

Right now, this doesn't look like a really big system, but it could drop perhaps low end warning criteria snow in a stripe where the best ML forcing occurs...which at the moment looks to be somewhere near the pike region perhaps into S VT/NH....

 

 

I'll note that the GGEM and UKMET are further north than this...though they have been drifting south. If they are closer to correct then this would favor more CNE than SNE.

 

 

Guidance has also sped up the timing versus a couple days ago...now mostly a Monday/Mon night event.

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Two days ago, models were showing low-end warning criteria for the foothills.  Now it's a whiff.  awt

Yeah, It was apparent to me it was slip sliding away over the course of the last couple days, I did not make the investment in it, But good luck to the ones that are in its wake.

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firstly, lots of possibilities still in the table with this event - no one from BTV to PHL (really...) is out of the game entirely.  there is really no room here for grousing.  

 

secondly, the governing mechanics are still safely out over the open ocean of the far east Pacific, and securely NOT in the more dense empirical part of the initialization grid.  regardless of what modelers and/or proud nws employees may argue, a-priori experience has shown that systems sometimes do morph rather abruptly when that relay over land actually happens.  

 

in their favor ...not that often - no. but, it does happen sometimes enough to argue assimilation can have holes.  

 

having said that, said relay begins in earnest 24 hours from this morning's 12z initialization.  as is it probably doesn't matter much for determinism because every ensemble there is known to the technology of this science has persisted with at least a minor to perhaps low end moderate snow event. BUT, should something more robust get relayed than that could/would likely up the ante here.  

 

one thing I am also noticing though is that the season's plague of wave interference could become an issue here, as the next wave is already pressing east out of the west just 84 to 96 hours from now.  that feature is the one the models have been toying around with being a more important closed event here in the E... the flow is fast and loaded energetically and things can mutate quickly in the runs; don't be surprised if mutations occur through this weekend - they will anyway, but bigger ones too 

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