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Late December Discussion and Christmas um Event


Cold Rain

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Still an interesting system, and even though things are slowly locking in, there's still lots of details that'll be ironed out over the next few days. Foothills and mountains of NC on north especially have something to keep an eye on (talking about the areas east of the mountains).

Interesting prelim HPC plot. They are not going as far north as the Euro and actually look closest to the GEM in terms of SLP track. Also, interesting to note that the GEM ENS is a little south of the operational. All charts are for 12z Wed AM.

Keep in mind, we really aren't talking about HUGE differences here, but as always, small details make the big differences for individual spots around here.

HPC prelim plot:

post-390-0-22818000-1356183007_thumb.gif

Models at 12z Wed:

post-390-0-97251100-1356183023_thumb.png

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With the 0Z CMC having gone a good bit NW, which would easily be enough to take the snow away from the bulk of N GA, with no CAD related wintry precip., with no model now giving sig. wintry precip. to the bulk of N GA, and with run after run if both the gfs and Euro doing the same, I'm reducing the chance from 5% to 3% for that area and from 10% to 5% for far north GA (nonmtn areas) for sig. wintry precip. The one to follow for these areas is the one near 1/1. Right now, I'm giving that storm a 25% chance of producing sig. wintry precip. for the bulk of N GA ATL-AHN north .

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With the 0Z CMC having gone a good bit NW, which would easily be enough to take the snow away from the bulk of N GA, with no CAD related wintry precip., with no model now giving sig. wintry precip. to the bulk of N GA, and with run after run if both the gfs and Euro doing the same, I'm reducing the chance from 5% to 3% for that area and from 10% to 5% for far north GA (nonmtn areas) for sig. wintry precip. The one to follow for these areas is the one near 1/1. Right now, I'm giving that storm a 25% chance of producing sig. wintry precip. for the bulk of N GA ATL-AHN north .

There's a rule in poker... no matter who the player is, there's always a 10% chance it's a bluff. I'd say the same for any given storm.... I'd give you 10% on the Christmas storm.

I try to keep that in mind right now and when I'm on the outside looking in.

BTW, I believe if we get nailed by storm 1, it helps you guys with storm 2 because it changes the orientation of the baroclinic zone. My dad lives in Winston and is a snow nut himself, so I'm watching from both perspectives.

Sent from my Milestone X 2

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There's a rule in poker... no matter who the player is, there's always a 10% chance it's a bluff. I'd say the same for any given storm.... I'd give you 10% on the Christmas storm.

I try to keep that in mind right now and when I'm on the outside looking in.

BTW, I believe if we get nailed by storm 1, it helps you guys with storm 2 because it changes the orientation of the baroclinic zone. My dad lives in Winston and is a snow nut himself, so I'm watching from both perspectives.

Sent from my Milestone X 2

Based on the climo infrequency (typically only one or two at most per winter for Atl-Ahn) in combo with the now total lack of model support for a winter storm now within only four days, I think 10% is being way too generous. I think 3% is more like it.

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Probably goes without saying but 12z runs will be interesting. Got to see if ukmet and Canadian and Nogaps will stay east of the apps. Looks like everyone else including NAM are heading north. Need to check if some gfs ensemble members are still showing an east/south solution . . .

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06z gfs is in lock step with the 00 euro. Heaviest snow is in NW TN near Dyersburg headed NE across KY. The rest of TN outside of the Smokys and maybe the Cumberland Plateau gets only flurries with little or no accumulation. Verbatim, only Boone and places around there get snow in NC.

The new years storm is non existent for the entire southeast, and even though there's a quick push of cold air it's not vodka cold due to a lack of snowpack.

The 00z ensemble members looked better for TN, but with the Euro locking in with the op GFS, there's a good chance they both are right.

I think it has more to with the position of the PV not snowpack. The pv dumped into the us on the 00z run last night and didnt on the 06z

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DT on 12z GFS....

Wxrisk.com The TECHNICAL or meteorological reason for this is that the GFS takes energy over Great Lakes and tries to PHASE or merge it with the big Low coming out of the Delta. I reject this solution totally AT THIS TIME....

I suppose something like this had to happen given the strong Model agreement of the past 36 hrs or so

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Looking out past Day 7...the feature for Jan 2nd is being held back a bit longer, but you can plainly see moisture is building over Texas at 252...

I know several people have mentioned that the 30th is the one we should watch out for...we'll have to see if the models ramp up the moisture in the coming days. I think we got a possible storm threat for those along I-40 in that timeframe.

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I wouldn't quite call that a Miller-B on Day 7...that more or less a quick moving s/w in the flow. 850's would support some frozen precip over Tennessee and into WNC...good advisory criteria event.

Well, there's a primary low initially over the TN valley then a transfer/redevelopment/coalescence into one LP off the coast. Thus the phrase "Miller Bish" :)

12zgfs500mbHGHTNA174.gif

In any event...it's probably a moot point until we get past the evolution of the Boxing day event.

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