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December Medium/Long Range Discussion


yoda
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36 minutes ago, WxUSAF said:

Yeah, but it's a lot closer than 0z.  Takes the 850 low right overhead.  Definitely less OH valley signature this run.  I'd actually wager it would have stayed all snow at DC this run except the surface low track is just onshore in VA.

It’s a noise level (at that range) adjustment either way from being all snow or a lot of tears in DC. That’s how we roll. 

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28 minutes ago, Paleocene said:

This looks really pretty to my meteorologically uneducated eyes.  Pretty cool to see that 50/50 and the block.


I remember past discussion of neutral or negative tilt being desirable for the area of low pressure in the southern US, this is relatively neutral right?

ecmwf_z500a_namer_6.png

Still slightly positive I thin. But that is as About as good as a setup gets. -NAO. 50/50 HP over the top. That is a classic crush job map. 

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1 minute ago, psuhoffman said:

It’s a noise level (at that range) adjustment either way from being all snow or a lot of tears in DC. That’s how we roll. 

For sure. All guidance, pending EPS, went that same way today and a good direction for us. Better than the alternative. 

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2 minutes ago, WxUSAF said:

@psuhoffman I know you said yesterday the outcomes for Monday and Wednesday seemed unrelated. But seeing guidance move in lockstep for both storms today has me wondering... 

I only analyzes one gefs run. On that one run 24 hours ago there did not seem to be any discernible correlation between the amplitude of the Monday wave and the Wed wave. But things can change. If they become less spaced the odds they impact each other increases. Also of Monday crosses a critical threshold and is amplified “enough” it would have to impact the next wave. Ill take a look at the 12z guidance to see if there is a more obvious correlation now. 

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4 minutes ago, WxUSAF said:

@psuhoffman I know you said yesterday the outcomes for Monday and Wednesday seemed unrelated. But seeing guidance move in lockstep for both storms today has me wondering... 

If there is any relation, I would maybe think a weaker, flatter system Monday would allow for a stronger Atlantic ridge to build ahead of wave 2. Would need to take a closer look and see if there's an impact. 

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