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January Medium/Long Range: A snowy January ahead?


mappy
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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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Just now, Heisy said:

Liking the GEFS at 129 hours, good separation and the main wave looks stronger


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Which wave would that be? If it's a stronger first wave then perhaps that's not the one we want? I mean 2-4" is nice, but it would come at the expense of a stronger 2nd wave. Hmm...

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Which wave would that be? If it's a stronger first wave then perhaps that's not the one we want? I mean 2-4" is nice, but it would come at the expense of a stronger 2nd wave. Hmm...

It’s the same one the OP GFS had that gave us the modest event on 20th. Looks decent


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