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Feb 8th-9th Obs/Discussion Thread


mappy

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  On 2/8/2016 at 8:06 PM, hosj III said:

DC never gets to 32. 33-34 overnight rising to 35-36 during the day. I really don't see how that gets you 4".

 

33 and moderate to heavy snow can accumulate on I-95....temps are no issue dude...

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Yeah, 18Z NAM is just a tad wetter, one could say.  I find it amusing on TT how the R/S line runs exactly on the Potomac River at 18Z tomorrow afternoon...probably an artifact of whatever algorithm is used and it's probably not worth parsing a whole lot...but it was kind of funny.  Anyhow, temps look colder than the 12Z NAM, into the mid-30s during the afternoon.  On the whole, I'd say quite improved from earlier.

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   one caveat here:   on that page, they also offer a run total accumulated snow with variable density.   It computes a ratio based on the temps instead of blindly using 10:1, and those plots today show smaller totals.

 

 

  On 2/8/2016 at 7:50 PM, Snowman. said:

17z run of the HRRRx which runs to 24 hours

lyRCqAp.png

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Normally we are inside the usefulness of the ensembles except for verification purposes but since we are talking a fairly long duration event they may have some utility left. Looking at the Euro ensembles they have bumped up qpf slightly from the 00Z run to where we now have .5" + running through Balt. We have also seen a slight shift of the precip field north and east. There has also been a corresponding response with the snowfall max increasing from 3 1/2 " to 4 1/2 inches.

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