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January Medium/Long Range: A snowy January ahead?


mappy
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2 minutes ago, Heisy said:


CMC progression is still completely different. Sometimes it does stuff like this outside day 5-6, but man that’s pretty stark difference. CMC probably leads to a much larger event if that energy comes E after the N/S races ahead

It would be a few days after the 20th though


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Yesterday this tendency (and duality of options) showed up in the EPS snow plots.  There were smaller hits around Jan 20 and larger ones around the 21-22 for the members that had a slower more amplified solution with that wave.  

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3 minutes ago, Shad said:

snowing new orleans, florida panhandle to NC at 207, lol

There have been very few permutations among all the ensembles and op runs that have a hit from both the 20th and 22nd threats...They are linked.  If more energy comes out with the wave on the 20th the 22nd is likely weaker and south.  If more energy holds back at the tail of the trough, the 22nd becomes a more amplified wave and a threat but the 20th is likely nothing.   It's likely one or the other.  There is a narrow thread the needle balance of energy that could lead to two hits but its not the most likely outcome.  

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There have been very few permutations among all the ensembles and op runs that have a hit from both the 20th and 22nd threats...They are linked.  If more energy comes out with the wave on the 20th the 22nd is likely weaker and south.  If more energy holds back at the tail of the trough, the 22nd becomes a more amplified wave and a threat but the 20th is likely nothing.   It's likely one or the other.  There is a narrow thread the needle balance of energy that could lead to two hits but its not the most likely outcome.  

This is a good post, the fantasy progression is basically the 12z GFS, but where the pattern leads to that second event coming up the coast.

My money is on the energy coming E for an event on the 20th because that’s where the euro is generally at, but we’ll see


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7 minutes ago, WxUSAF said:

TPV sitting in Ontario and Quebec is not going to let anything climb the coast. Need it either well west or east. 

GGEM has that centered back near Hudson bay with a block over the top, more of an AO block than NAO but with a TPV over Hudson that's actually a really good configuration.  And it leads to snow.  Let's just hope the GFS is wrong with parking the TPV right on top of us, but it's probably good that its only the worst model doing that right now.  

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5 minutes ago, Heisy said:


This is a good post, the fantasy progression is basically the 12z GFS, but where the pattern leads to that second event coming up the coast.

My money is on the energy coming E for an event on the 20th because that’s where the euro is generally at, but we’ll see


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It's all on the table... where the TPV sets up, where the block over the top of it is (new wrinkle) and how the energy in the flow underneath interacts and ejects.  And those are way too many moving linked parts for the guidance to get this nailed down at any kind of long leads.  This is more of an inside 72 hours kind of setup, which I know is frustrating but it is what it is.  

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