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Christmas Storm IV


Cold Rain

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Pardon the stupid question, but I believe last year we had a storm come on a similar track that tapped into the gulf pretty well. However, the convection that fired up in the gulf killed the moisture train. Is that not a concern with this storm because the moisture will be pulled from the Atlantic? Sorry for the amateurish question, but the board is quieter now, so I thought I throw that out there.

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This may be over reading into the strength differences but I suppose it is possible depending on which mountains it crosses and terrain the vort would be impacted in the model (higher mountains and vorticity weakens more at the peaks). Someone can correct me if I am wrong on how well the NAM handles terrain with respect to this.

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This may be over reading into the strength differences but I suppose it is possible depending on which mountains it crosses and terrain the vort would be impacted in the model (higher mountains and vorticity weakens more at the peaks). Someone can correct me if I am wrong on how well the NAM handles terrain with respect to this.

NAM is run at 12km grid spacing and should have a much better terrain in it. For those who are unaware, vorticity in the column shrinks as it goes over the mountain peaks and strethches as it comes out on the leeward side. This is why we see a low pressure or inverted pressure trough once it gets east of the mountains.

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