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Second Half of December Weather Banter and Obs


TheTrials

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250mb jet is gorgeous at 165..but it looks a bit too far west for my liking. The baroclinic zone is desparately trying to push east, but it's not making much progress.

The H5 trough is also pretty disorganized. The ridge over the west coast is collapsing east rapidly.

Perhaps a "rolling" eastward ridge can "cancel out" an initially too far west jet. Plus the baroclinic zone will certainly be shifted eastward because of the prior wave.

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yup, we get some snow this run.

The picture painted at 162 is actually pretty good. Moisture building over TX with the gradient setting up due to the trough dip. Nice ridge out west, and enough of a convoluted setup in SE canada and cold air to allow us to get snow.

however, it can phase and allow the trough to go negative earlier and give us rain. The trough actually stays positive this run so who knows where we will be 7 days from now, lol

something to track atleast

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Basically there will be three storm threats that could give us rain/snow. The first will be before even xmas eve although that one clearly looks to be all rain, temps cool off at the end in the NW burbs and higher elevations for a little bit of snow. The xmas eve/day shortwave could be more of an event. The presence of very strong high pressure in New England may be enough to keep us cold enough to see some snowfall, especially just inland and N and W of the city.

The lack of blocking issue really shows up with the second storm, as even some blocking would not allow the shortwave to cut inland and kick that strong of a high out. The third has the most potential, it will be packed with gulf moisture and the ridging out west looks decent. It's cold enough for now, but without blocking,

it could easily become a rainstorm for us if it amplifies too much or the ridge is misplaced. Timing is everything when you don't have a safety net (blocking, -NAO) and your more likely to lose than win, but at least the potential is there this week and that's the best we could hope for in a still unfavorable pattern.

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Man really close call...temps marginal but potential

Def. marginal at best. Models are struggling with the shortwaves in this pattern too. We are seeing fairly dramatic changes from run to run. The shortwaves are embedded in a very active flow...with the PV over Central Canada and a cutoff low over the SW US.

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