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Pattern Discussion 12/15 and beyond


ORH_wxman

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The pattern is kind of a mess on the GFS leading up to the bigger storm...a lot of convoluted shortwaves up north. The longwave pattern still is definitely very favorable for some kind of storm in the eastern CONUS...whether it cuts or not is not very predictable at the moment. Guidance on the whole has trended further south that that block which is why more solutions in the past 12 hours have been redevelopers rather than pure cutters.

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GFS is interesting. It brings the low to just south of SNE, with this QPF blob almost trying to pull the low east, with the now well developed secondary low still hanging tight near the coast thanks to a strong vortmax. It also tries to pull down a PV into Lake Superior. The Canadian has a similar setup, but that second PV was further east.

The seems like the type of scenario in which we'd get a "subsume" dialogue out of Tip, complete with references to Feb, 1978.

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HPC on board in a big way on a redevelopment on the coast for the 27th. It looks like there is a pretty strong high north of Minn...does that bridge over and provide a cold high feed into the storm? I know sometimes in coastals their will be a high well to our nw that is able to build in. BTW I'm in Chicago today so I will get to experience brief near blizzard conditions this evening.

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So going forward, it's tough to always remember not to get too excited, but I think all guidance at the very least have a decent look to the whole hemispheric pattern with what appears to be colder air and storm chances thrown in. Really, that's all you can ask. The ridging into AK starts to connect over the N pole and towards the other side of the pole into Russia. This helps bring the PV on our side of the pole further south and therefore, helps with bringing colder air into the CONUS. Both the GEFS and EC also show very weak ridging into Greenland, but again, this tries to reinforce the idea of keeping colder air moving southward towards the CONUS.

What could go wrong? Well the ridging into AK is key so if that decides to go poof, then so will our colder air, but this ridging could be the start of the 50mb warming we are seeing moving east.

http://www.cpc.ncep....emp50anim.shtml

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