WxUSAF

If there's any time to try and hold onto snow cover, it's 5 days before the solstice...

Mt. Holly hoisted watches

You just want all of us to see how you're in the 20"+ zone

Oops, you accidentally left me off the list!

He's still around some, but lives just across the PA border now.

Present from @mitchnick. 18z GGEM liquid equivalent precip that falls as snow. @mappy jackpot, but all of central and north MD is solid. http://meteocentre.com/numerical-weather-prediction/precipitation-accumulation.php?lang=en&map=qc&run=18&mod=gemglb&hi=000&hf=120&type=SN&mode=latest&yyyy=latest&mm=latest&dd=latest&capa_verif=off

84hr CIPS analogs to the 12z GFS. Some absolute classics on here: http://www.eas.slu.edu/CIPS/ANALOG/DFHR.php?reg=EC&fhr=F084&rundt=2020121312&map=thbCOOP72

I was really confused at first. But the legend at the top works out. Goes Tr-1", 1-3", 3-6", 6-12" in the blues.

This isn't bad I think. Gun to head, I'd probably say 5-10" for MBY. I'm pretty close to the boundary between his 6-12" and 3-6".

Flagged as banter

The New England piece of the airmass is definitely arctic. Dewpoints below 0F is a classic sign of that. For us, we have dews in the teens. That's a respectable polar airmass, but nothing super special.

CAD being underdone is the one weenie rule that actually works for us most of the time. But keep in mind that’s for surface temps most, not warm layers aloft.

What if, hypothetically speaking, you were like 3-5 miles from the fall line and, hypothetically, at like 375’ elevation?

I’d say this 18Z Eps is the last run I’d weight as high as the Op. I’ve been saying 0z tonight is my benchmark and we look in tentatively good shape.

Temp down to 52. 20F to go!!

Looks like I need to measure a hundred feet farther north than usual to tack on another 10"

Yeah, not time to diagnose mesoscale features yet and it's hard with the Euro since we don't have skew-t's. Those seemingly inconsistent things usually resolve themselves. Either way, seems like we're generally in a pretty good spot for the CCB to rip. Locations farther N/E most favored. You and @mappy probably get smoked. @showmethesnow and @mitchnick's new house are in absolute prime position.

Need the GGEM's thermal profiles and a slower forward speed? For DC to verify WSW, there's going to have to be some CCB snow almost certainly. GGEM would nearly get it done with the WAA snow before mixing.

1989-90 waves hello

850 looks to be the warm layer. 925 and surface stay below freezing for the duration IMBY. So snow-sleet-snow, which is what I always expected. Definite banding signature on the back end around 6z that moves through to the east after that. But still a pretty nice front end before mixing for many...3-6"?

That's banding. Descending air on either wide of the deathband creates warming. Notice the very cold (comparatively) temperatures just east of it. @CAPE and @JakkelWx are turned on by that.

Me driving home from picking up my daughter at 1-115pm Then I saw the Euro when I got home Then I saw the CCB Wednesday evening into Thursday morning

If somehow that 10:1 euro snowmap verifies, that sound you'll hear at 2am Thursday is me running naked up and down Route 108.

Euro saves Christmas

Seems fairly clear to me the OH valley low is no longer any issue. We’ve solved that riddle. What’s left is the precise surface low track. And it seems to me that all these seeming big changes are just due to subtle differences in where the surface low gets captured by the upper level energy and how offshore convection torques things. The convection is going to remain a wildcard. The upper level part may get nailed down a bit more, but these aren’t radical changes by any means for a ~72hr forecast. Of course it makes a huge difference in sensible wx outcome to most of us.