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Dec 16-20 Snow/Mix events - Going over like a fart in church


HoarfrostHubb

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Wow, QPF bomb at 84 hours over the interior...mid-levels have just gone above freezing by this point though. That would be an ugly icing setup assuming the 2m temps are cold enough...of course the GFS probably shows 2m temps of like 38 or 40F.

The freezing line at 2m gets right up to northern Mass. border with VT/NH.

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i don't know if the profile will stay cold enough to support snow but with the wave on the boundary i can't see how the traditional good CAD locales warm very well at the surface sunday night into monday AM. could definitely see where this is a light snow to ice deal for those areas that typically hold in the low level cold well.

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I don't know if it is a colder solution vs just having amore stout first wave as the s/w breaks off to the east.

Its not a whole lot snowier than 06z for SNE (maybe an inch or two of front end), but the mid-levels def trended colder when I look at CNE. The more strung out front wave definitely helped some.

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Its not a whole lot snowier than 06z for SNE (maybe an inch or two of front end), but the mid-levels def trended colder when I look at CNE. The more strung out front wave definitely helped some.

Yeah I think that helps, and not having this crazy second wave moving up too. The lingering low hangs around just to the east and filters colder air back in too.

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Anyone noticed this morning the observation of the NAO values is up & there's ensemble agreement that it will continue that way even reaching nuetral/positive values during this event. That would have big ramifications for this storm.

Do you think the models at this point have been overdoing the west based -NAO?

http://www.cpc.ncep....ndex_ensm.shtml

Actually, I think the ridge axis will be pulled so far to the west that it will screw up the technical calculation... the pattern is still good for Eastern U.S. cold, despite the actual NAO values being less negative(or even neutral).

It's numerical semantics, really ... what matters is the block is there and the long range pattern is cold.

As far as its impact on the upcoming event, I really don't pay attention to the actual NAO value for any particular event. There are more important, smaller scale features that impact a storm's evolution at shorter time scales.

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the GFS will be pretty bad with that though. i'd take that and drop it to the pike and then just run the topography of that region. you can even see the GFS showing CAD in its own poor resolution way.

Yeah it has sfc temps around here of 37F while just aloft it is 42F, lol...that is the "GFS CAD". Starting with temps in the low to mid 20s on Sunday morning with a sfc low getting squeezed south of BID...yeah, that isn't going to get it done for warming up the sfc in the interior by 15 degrees.

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Yeah it has sfc temps around here of 37F while just aloft it is 42F, lol...that is the "GFS CAD". Starting with temps in the low to mid 20s on Sunday morning with a sfc low getting squeezed south of BID...yeah, that isn't going to get it done for warming up the sfc in the interior by 15 degrees.

it'll be interesting to see how much moisture gets squeezed out. that would be a decent ice storm for you for sure.

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