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December 2017 Mid-Long Range Disco 2


WxUSAF

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Just now, BlueDXer75 said:

Thanks for all the work you do.  I work overnights and look forward to your analysis

No problem! I'm just a high school student with all the free time in the world because I'm on Winter Break. I'm not too scientific since I lack too much knowledge about that, but I try my best

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14 minutes ago, Cobalt said:

Euro/GFS latch on to idea of targeting cold dump to Midwest rather than Midwest/West. Probably means colder temps for us as well

850's looks different at Hours 216 and 240.  Is there some sort of s

 

Just now, Cobalt said:

Euro is bone cold for Wednesday morning

ecmwf_t2m_washdc_35.thumb.png.0b3115fd9b175c8c8dbd216d7cfe2687.png

850's looks different at the end of the run.  Is there something brewing in the southern states at that time?

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0z EPS still adds 1" of precip to the mean after the 25th. Doesn't look like the best pattern for big snow events, but we can still get some light-moderate events during this I'm guessing 2 or 3 week period of cold. I like the idea of nickel and diming our way to climo snowfall, and Nina winters excel at this eps_tsnow_m_washdc_61.thumb.png.33950ae976027e9e75507b59360ec5ce.png

 

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Before I go to sleep, just giving you the NAM's take on this Thursday's event

namconus_ref_frzn_neus_39.thumb.png.ae3a54d34e63ce6bb3e85892e79a9434.png

North by a bit compared to 0z. So far the model bias has been South and weak, so if this known bias is the same, we have have a chance of this going North. Not much probably, since ground and air temps aren't the best. I'd say best case scenario (maybe 3% chance, I know this is an arbitrary number but it's a guess), of 1-3" of snow for DC, and maybe SE burbs, since those areas would have the best chance of colder air while the storm departs. A long shot, but we've gone from no snow to 2-4" in the models in mere days. You never know. Anyways, I'm gonna hit the hay. Hope these posts were informative for those who wake up and see these in the morning. 

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Without nitpicking at 6 days out, GEPS has joined the GEFS (which ironically has become steadier and more consistent) in signal for a coastal low on Dec 25. EPS has more of a wave. Would like to see this slp develop a little farther South/quicker on future runs but we should take this look and run all things considered. I wouldnt be surprised to see the ops toss around a fantasy run today at some point. I havent dug any further into the ens or individual members yet.....will do later when time permits.

 

Eta: EPS mean is actually a much better slp signal just displaced West along immediate coast which is weird given the EPS had a BIG time favorable shift at h5 getting front cleared 12 hours sooner and cold air rushing in much quicker. Really good trends.

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