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December 27/28 Storm Threat


Baroclinic Zone

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Just woke up and took a look at the 6z GFS ... very interesting the jump it made toward the ECMWF and CMC...

Remember I mentioned that vorticity lobe that was itching to subsume into the Dec27 trough? Well what ends up happening in this new situation is that instead of continuing westward around the anticyclone to the north, this vorticity lobe ends up drawing our Christmas Day snowstorm north and fujiwaras with that shortwave, ending up over Nova Scotia instead of Ontario

Beautiful case of a bifurcation of solutions. There is a fight between the easterlies south of the anticyclone over the Hudson Bay and the westerlies across the CONUS ... Take a rotating parcel of air (or lobe of vorticity) and shift it ever so slightly north or south and you'll find that parcel of air in drastically different locations later on.

The GFS possibly just admitted defeat to the Euro and CMC in this one respect

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