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Second Half of December Weather Banter and Obs


TheTrials

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Lots of clippers on the 18z GFS (some have BL issues) - better than nothing. And the Euro trended better for the storm it's showing.

GFS depicts a nice pattern post D7 as it has been the last few runs. Pops several PNA ridges and gets the northern stream going. Could be a good pattern for 40N. Let's hope it has a clue.

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OT.

GFS holding firm in warming the pole and changing things up.

18z run plus ensembles look very encouraging. Operational run loses the +AO by day 10 with height rises, then tries to connect the PNA, NAO, AO heights across the top by day 16. Most members going towards the PNA ridge / eastern trough / declining AO post 240hr.

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18z run plus ensembles look very encouraging. Operational run loses the +AO by day 10 with height rises, then tries to connect the PNA, NAO, AO heights across the top by day 16. Most members going towards the PNA ridge / eastern trough / declining AO post 240hr.

Way out there but it shows the potential in this pattern:

http://www.meteo.psu.edu/~gadomski/ENSHGTNH_18z/ensloopmref.html

Note the top left member - operationa run - out at 384hrs. Blocking connects yielding cross polar flow and -20c 850s pouring into the US by that time frame.

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Behind Tuesday night's soaking rainstorm (which also appears to bring gusty winds for Wednesday), the models are going really cold at least compared to what we've seen under this pattern for Wednesday night, with the GFS and ECM showing mid 20s in NYC and 10s in NW NJ. The 850 mb temperatures aren't as cold as the last time temperatures got down this low, but at the same time there's also supposed to be mostly clear skies with possible north winds. Perhaps the models could be a bit too cold, but the potential is there for the 2nd or 3rd coldest night of the winter so far on Wednesday night.

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Interesting

0z GEFS is on the benchmark.

23mwv3s.gif

The OP GFS made a big correction south, but not enough for anything major. I think we see light snow at the end because there are 2 frames of precip and 0c or below 850s. Ensembles might be under-doing the SE ridge again, but interesting to see it so different 4 days out.

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