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Mid-Winter Crisis or Start of Something Big?


mitchnick

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GFS 12Z op solution really isn't a huge deal ATM. A comparison of the 0-6-12Z operational runs is far far more revealing, and each run trends more amplified with the diving trough/dynamic tropopause and an eastern budge to the western trough. The final result is a better phase at 84. http://www.atmos.alb..._trend_500.html

Compare at 84 hrs of the 12Z run. The12Z GFS is about 2 runs from going loco if the phase comes in better and the trough continues to nosedive S. The deep dynamic DT and a farther S solution would result in potentially tropospheric deep cyclogenesis. Positive feedback for the win--and the GFS solutioon would look awfully like the CMC with tiny changes in the placement of the western trough and eventual phase resulting in a GOM tap.

GFS ensembles are way more amped than the op--and this reminds me of last storm where the GFS made slow changes to its height field even while the mean was way more amped. SREF/NAM height fields wiped the floor with the operation globals--and they are very amped here--more so than the globals. All this is suddenly making this event all the more interesting. ECM is a fat outlier--but it too has made some very positive changes with amplification. It really is the biggest outlier in its western wave--and it has a weak phase. Right now still a somewhat low probability (less than 40), but the probability is increasing rapidly for a CMC like solution.

I like this explanation from over in the PHIL thread.

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I actually think the GFS has been better than the Euro so far. The Euro has struggled a bit on the last several storms, especially in this range.

Amazing to think it but you're right Phineas. GFS (in my mind) has done much better. In fact I'd be willing to get just a little bit excited just based on the GFS showing something and the Euro not.

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