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Wintry December 4-7 Winter Precip Chance

I think I’d be very encouraged if I lived in NE NC, and I wouldn’t give up either, but as of the way things are looking, chances drop off the further you get from the border.
Ordinarily I wouldn't be too excited being on the southern edge of those snow accums but if this slows just a tick, almost a given the slp will be a little more NW and can get into a few hours of decent rates as 850's crash..... well I'm cautiously optimistic
 
AKQ thought it deserved a mention.

a805d9b15ece80552041c0ff97ec0e80.jpg
 
When all is said and done I bet the low placement will almost be ideal for RDU. Will be a shame to only get rain.
 
I've probably spent too much time following what will likely be a marginal event... but I do see a path for this to trend better with colder temps and more precip if we can thread the needle with the northern stream especially.

Something stood out to me on the 00z and 06z suites. We've been referring to the northern stream as one entity, but at the moment it's really two different waves, labelled here:
two_piece_ns.png

Note that this second piece still isn't ashore- and won't be until 00z today. That means there's still room for sizable shifts in model depictions. By Sunday evening, we see these two waves diving south with the southern ULL approaching. The GFS is alone with its depiction of the interaction between these 3 players:
gfs_vs_world.gif
Most 00z global models phase the southern ULL and the first wave, which I'm seeing as unideal (leads to all those weak precip/snow in VA Monday afternoon solutions). The second wave is what's a) bringing the cold air and b) has the potential to provide favorable forcing for a coastal cyclone, if it can tilt more.

The 00z and 06z GFS, on the other hand, let the first wave pass by, so that the southern wave interacts more directly with N/S wave 2. If we can get models to trend in the direction of the GFS (and a bit beyond), the surface low will have slower timing, which would hopefully be sufficient for our boundary layer problems, and will be stronger/wetter, hopefully tucked in closer to the cold air/without too much of the warm air issues that usually brings.

GFS vs. the world is... not a great bet. But we'll see; should have a better grasp on this second wave by 00z tonight or 12z tomorrow, once the second wave is onshore.
 
I pulled this from American. Dave Tolleris has a decent write up. Mods, if not allowed, feel free to remove.

 
I pulled this from American. Dave Tolleris has a decent write up. Mods, if not allowed, feel free to remove.


I love the fact that I can go to the MA forum in American and not be disappointed. They ALWAYS have mental breakdowns that are epic and hilarious.
 
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