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Dec 9th Winter Threat


ORH_wxman

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Euro is following the GFS's lead tonight...pretty paltry precip..though it is very cold. BOS prob doesn't change over until close to noontime on the Euro. But qpf is generally 0.2-ish through 18z Monday.

 

So we'll have to see if maybe the GFS scores a rare coup or if it's a one run nuance.

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It's just One Op run of the ECM.  That's not caving.  We have to see  more and blend with other guidance. Also, GFS  seems like it is having problems wrt  WAA  in the overall SWFE.  Just my HO.

 

Tonight's impact guidance at hour 72 averaging all CIPS analogs....either the models are about to score big or they are very wrong because you generally do not see this type of discrepancy this close in to the event on past impacts on similar events vs. the incoming one..not much guidance tonight showed any chance of 2-5 inches of snow across CT or MA.

 

COOPmeangfs212F072.png

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Tonight's impact guidance at hour 72 averaging all CIPS analogs....either the models are about to score big or they are very wrong because you generally do not see this type of discrepancy this close in to the event on past impacts on similar events vs. the incoming one..not much guidance tonight showed any chance of 2-5 inches of snow across CT or MA.

COOPmeangfs212F072.png

If that's a mean 72-hr snowfall does the event tonight factor into these analogs at all?

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This sounds like a weenie comment, but in my mind...the NAM depiction for Monday makes a little more sense to me. I wouldn't be shocked if the GFS and Euro improve the depiction at 12z.

Luckily that wasn't your first post ever or you'd be 5ppd for taking a longer range NAM over GFS/ECM :lol:

But yes it's hard to see that paltry QPF with the amount of iso lift that should be generated by the WAA. The dynamics are sooo far west though so maybe...

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This sounds like a weenie comment, but in my mind...the NAM depiction for Monday makes a little more sense to me. I wouldn't be shocked if the GFS and Euro improve the depiction at 12z.

 

 

Without big PVA, the models will probably at least have some trouble depicting QPF that is almost all WAA drven. 2-4" is my call right now.

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Without big PVA, the models will probably at least have some trouble depicting QPF that is almost all WAA drven. 2-4" is my call right now.

I mean maybe the lack of PVA and lousy upper level jet structure is hurting this, but there is a decent cold dome and LLJ moving north with good theta-e advection. I had the over/under at 3.5" yesterday here in Andover. Of course models were a bit juicier...but I'll stick to that for now. 2-4 seems good to me for a good part of the area.

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