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January 12-14, 2019 Storm Discussion STORM MODE


WxUSAF

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31 minutes ago, Bob Chill said:

Everyone should look at SW OH and the sig bump in qpf on the ukie. As this storm progresses, ops keep bumping up the qpf in the waa piece. It's continuing. Of course we have to deal with the lee side of the apps and such but there has been a universal trend in the midwest/oh valley to increase QPF as leads shorten. We're next at 18z and 0z tonight... hopefully...

There is enough of an easterly surface wind component that the App shred effect shouldn't be too extreme.   This won't be one of those times where the mountains totally eat up all the moisture when the moisture feed is weak sauce and there is a SW surface flow.  

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1 minute ago, jackb979 said:

Anyone disagree with CWG's timeline a little bit? seems like they have the onset a little too early (saurday afternoon) and ending too early (sunday morning) when some models have shown this going into 12z and 18z sunday 

Onset has always been late morning - early afternoon tomorrow.

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2 minutes ago, jackb979 said:

Anyone disagree with CWG's timeline a little bit? seems like they have the onset a little too early (saurday afternoon) and ending too early (sunday morning) when some models have shown this going into 12z and 18z sunday 

Their timing is okay, but their percentages for the boom/bust scenarios is somewhat befuddling.  Having your "official forecast" book ended by two 20% boom/bust options means your only 60% confident in your forecast.  That doesn't instill much confidence in their product.

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2 minutes ago, jackb979 said:

Anyone disagree with CWG's timeline a little bit? seems like they have the onset a little too early (saurday afternoon) and ending too early (sunday morning) when some models have shown this going into 12z and 18z sunday 

Using a blend, the overall forecast is very good on all variables. They can dial it in as minor details become more clear. Their forecast is easy to understand for the general public. 

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Mixing may not be that big a problem anywhere north or west of RIC, certainly on the edge there but when the coastal starts taking over, colder air over the Potomac region will slide south and I would envisage the mixing zone being closer to southeast VA as a result. 

Going with these amounts: 

Max for storm in axis of CHO-north of EZF to Easton MD, 6-9 inches

4 inch line parallel to that with northward jog around higher terrain, approx IAD-BWI. DCA therefore in a higher snowfall position but will they measure it? No, so amounts all 4.0" (DCA should be 5.5).

2 inch line just around PA-MD border. 

On the southern edge of snow zone, 4" from RIC to Ocean City MD, extending southwest from RIC towards n/c NC. 

LYH and ROA about 5"

 

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RGEM ensemble continues to hug the FV3.  It's similar to last night's run, but a little drier.

nUTglLu.png

Last night someone mentioned the spread among the members.  I can only plot these maps for 24-hour increments, so the below maps don't cover the entire storm.  But they cover most of it.  The first is the percent of members with at least 5 mm (about 0.2") qpf as snow.

EIejtDp.png

This one is for 15 mm (about 0.6").

K2GRAMq.png

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2 hours ago, Eskimo Joe said:

Wouldn't surprise me to see LWX nudge the watch up into Calvert and Charles County in MD and Faquier, Stafford and Prince William Counties in VA.  There's been a consistent bump in the 06/12z guidance for near warning level snow in that area.

Definitely think LWX nudges the watch further north now.

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3 minutes ago, NorthArlington101 said:

its gonna be 5"+ at DCA... not sure if it meets the criteria of "x" inches in "y" amount of time.

Last I looked they had 4 inches as the expected snowfall for the national mall so this is in line. 

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