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December 14/15 winter storm threat


Typhoon Tip

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nice Scott, is there a model attribute that you can look at that will help pinpointing where the CF will park? say some convergence at bla blah ..

 

It's gut, model placement of features like LP and HP, antecedent cold..etc. Like I can look at the GFS and know the CF will not get to 495. Maybe 128 if it's lucky. Just going by my gut.

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HP pressure placement. Anywhere from branching out from the Great lakes to nrn ME is good. You want a more concise HP center in that area. 

 

Rapidly deepening low assures ageostrophic flow from HP to LP and will pin the CF right at the coast. 

 

Low track..Track near the BM normally means CF will not make it far inland, but this one may not behave as such due to parent low out west and lack of deepening. 

 

Cold antecedent air. Cold air will want to move to warmer air..aka the ocean so that creates an ageostrophic component too.

Something for the weak-sauce solution proponents to ponder...

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Yeah it's not classic, but it's good enough to keep it mostly snow. Honestly if this low deepened a bit more it would probably be even better. Just because the low comes closer does not necessarily mean the low levels warm. A bombing low near Chatham can keep BOS in the 20s...aka Boxing Day 2010.  So there is a variety that goes into how low level cold stays. SSTs clearly matter too and so does the flow just above the surface like at 950mb. Usually I like to see those winds more E and NE to help keep the layer above us just cold enough. That layer looks to warm up a bit which may cause a brief taint. I still think the GFS is too warm overall. I mean look how close the NAM came and that was colder. Mesoscale models resolve those features a bit better.

I think 12z guidance thus far has come in a little stronger but as you said, they are also still cold.  Win-win.

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I think euro will be closer in today.

 

 

I mentioned this last night when I was talking to myself on here given the vort track...I could see this coming NW a bit. Its been the most SE model thus far so I think it will make at least a little bit of a jog NW.

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Should be a fun storm. The greedy interior and NNE folks can step back away from any sharp objects and bridges.

I just like it looks to include everyone at this point. Everyone should come out of this with snow on the ground.

Still over 2 days away though. Feel like we've been watching this for a long time lol.

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Pickles if you want a good high, the Canadian is a better position. Look how it holds its ground north of ME even with that track. That would really pin the CF near the coast.

well a lot of us def do!

 

I'm gonna be lookin at the 2m temps on  BTV WRF runs as it gets into it's time frame w this one.

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Nice to see another Franklin Co. poster.   Welcome!

Hiya. Been here for awhile but mostly I observe as I trust these discussions more than any other weather forecasts. (once you remove the outliers :) ). My boss has a show with 250 kids at 7pm and we are wondering whether to cancel or not. Just trying to get a feel for when the snow will start to get bad.

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