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Jan 25/26 Storm Threat...(Part 3)


Marion_NC_WX

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Must of been a blip @57 1028 high over NH...moisture exploding across LA...not sure but this thing might start making a more inland track

I think that is the second HP that has been there the whole time, but no one ever took it into account. I know Brad Panovich said something about it re-enforcing the first one..

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Lastly, I do not think that KCLT will fair much, if any better than KRDU. Why? The CAD wedge is not very well established by the time precip arrives, and with the amount of WAA associated with this low, the wedge should be eroded fairly quickly out to KCLT. Let's pretend the wedge holds, well 950 temps are forecasted to be at 6.0C+ on both the NAM and GFS by the time precip really starts coming in...which would still yield rain! The argument that both models are way too warm at this level doesn't hold much water in my view, as there isn't much colder temps to the north or west. Honestly, there is no way both of these models are going to blow temps across the entire eastern seaboard by that much. Now, by the end of the event I suppose a near isothermal layer could setup somewhere under the deformation band, and this area might have the potential for some very wet snow, with ratios of 5:1 at best, but I just don't see much support for it in the model soundings I have seen. I don't have access to the euro, so that is the one model that could be colder. Even so, I stand by everything I have said.

Looks like the 00z NAM is about to back you up.

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Repeat- this is all bout dynamic cooling. Most folks will not get all snow based on the trends, but if the upper low can deepen enough then some may still get heavy wet snow once the upper vort max/low comes overhead. A classic dynamic cooling storm perhaps like March 24 1983- heavy rain to heavy snow.

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Repeat- this is all bout dynamic cooling. Most folks will not get all snow based on the trends, but if the upper low can deepen enough then some may still get heavy wet snow once the upper vort max/low comes overhead. A classic dynamic cooling storm perhaps like March 24 1983- heavy rain to heavy snow.

There's actually some pretty large dewpoint depressions in those warmer layers around 800-900MB...large enough the wetbulbs are down around 0C at hour 60.

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Using this logic we should be able to get snow anytime of year. I'm sorry, but without some cold air in place at all levels, I don't care how cold it is at 500mb, you are not going to get snow - deformation band or not. If it's warm enough aloft, it could actually warm up more with the heavy precip rates!

This is true as the precip could drag down some of that warmer air aloft. As for your earlier post I think it is pretty much spot on.

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