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November 2013 pattern and discussion


WxJordan

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Looking closer at Bufkit, the OP GFS is like "loltoowarm" even if snow wanted to fall with such shallow moisture..  it would melt or evaporate before it hit the ground off the 12z OP run.

 

Hopefully you guys in NC might can see a little something though!

 

KCAE:

lol.jpg

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WxSouth had this to say:

 

 I wouldn't get my hopes up on a big snow event in the east based on the trends and the fact that Euro sometimes is a little rough in its 7 to 10 day progs lately, but sometimes what's originally modeled gets brought back later on, and the fact both major globals have had a major cutoff in the East before means there's a lot of conflict with how they're handling the Western Ridge at times.
 

 

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This is really why I brought up this past January as an example - there aren't many differences between now and then, in this scenario. 

 

Both were modeled in progressive flows.  Both saw the Euro throw out a snow map that seemed dialed in for a few days.  Both also featured the GFS backing off on each or every other run, eventually proving it's solutions to be closer to the actual conclusion.

 

The only real difference is that January had climo on it's side.  Seems like there's a learning opportunity in here somewhere.

 

The looming cold is a different story, and one I hope continues to show up in game shape this winter.

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 The 12Z FRI Doc clown has record high November snows from Atlanta down to Tony's place and over to Athens and also Lookout's abode. Fun to look at but there's no way I'm buying that the greatest November snowstorm in 135+ years will occur! Also, I suspect the clown is just playing with us. ;) I'd have a lot of doubt that nearly that much would actually accumulate. 

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 The 12Z FRI Doc has record high November snows from Atlanta down to Tony's place. Fun to look at but there's no way I'm buying that the greatest November snowstorm in 135+ years will occur!

 

You're probably right. It will probably trend north 3 days out or just not happen at all even to the north.

 

Specific EURO totals:

 

1.2 Winston Salem

1.0 Boone

1.8 Charlotte

Large swath of 2-3" in SC/GA.

Swath of 2-4.8" in Wilmington, NC north-east,

0.3" northern Waycross, GA

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NWS Greenville

One thing we are more certain of is that it will be a chilly middle-
to-late week...as Arctic high pressure builds into the region in
association with the trough. In fact...p-type concerns (rain vs
snow) remain with any precipitation that does manage to develop Tuesday
night/Wednesday morning...as intense cold advection overtakes the area.
European model (ecmwf) forecast soundings for Wednesday morning would support snow as far
south as the I-85 corridor. Similar to yesterday...we will advertise
a largely climatology-based p-type forecast...snow over most of the
mountains...ra/sn mix across the far northern Piedmont/foothills
areas...and -ra elsewhere.
 However...it must be stressed that
confidence remains atypically low. 

 

NWS Blacksburg

Tuesday night into Wednesday...a wave of energy rides north along
the departing front...stalls it over eastern VA/NC...and the low
then deepens as it then progresses north along the Delaware-Maryland-Virginia
peninsula. This developing feature will build back moisture into the
cold air that will be continuing to arrive into the region in the
wake of the cold front. The eastern extent of the forecast area
would receive the greatest amount of precipiation...with the western
parts of the area...the least. Snow would be most probable Tuesday
night across the mountains...and along and north of the Roanoke
River basin...with rain elsewhere. On Wednesday...as temperatures
moderate...the snow would transition back to rain at most locations
east of the Blue Ridge with isolated rain or snow showers in the
mountains. Wednesday night...precipitation would end from west to
east in ever decreasing coverage as the coastal low continues on its
northerly track. However...heading into the overnight...temperatures
will again fall back to under or around freezing...and a transition
back to rain/snow would take place in areas that experienced only
rain during the day Wednesday.
 Quantitative precipitation forecast values have trended significantly
lower than past few model runs during the 48 hours ending Thursday
morning. 

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November snowstorm in Atlanta. This is totally happening per latest modeling.

In the end I think Atlanta gets clobbered and most of nc will get shafted save the mountains. SC is a toss up but the NC lowlands are screwed

Ha. I'm going to stick with climo and say cold rain for everyone on the SE forum  :bag: (except the mountain folk in NC)

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18z GFS not great, but better.  Looks a lot like the 12z Canadian.  It does show lee side troughing / enhancement SE of the mountains that Moto mentioned.  This really reminds me a lot of the event this past Feb with crashing heights just west of the apps...but this one looks a bit more positive tilt, so not quite as good...we'll see where it goes from here.  GFS is good with how it handles the lee side enhancement look.

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18z GFS not great, but better.  Looks a lot like the 12z Canadian.  It does show lee side troughing / enhancement SE of the mountains that Moto mentioned.  This really reminds me a lot of the event this past Feb with crashing heights just west of the apps...but this one looks a bit more positive tilt, so not quite as good...we'll see where it goes from here.  GFS is good with how it handles the lee side enhancement look.

 

This thought has crossed my mind and shows very striking similarities with what happened then. That is what the GFS,GGem and clown map dgex has really been simulating imo.

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So, both the Euro and GFS are giving mby a quick 2 to 3 inches of snow late Tuesday night. Can I cash out my chips now???

 

It looks to me like there isn’t even  a concern with boundary layer temps.  Lower level temps quickly wetbulb below zero on both models once precip starts.  The only question is how much qpf can we squeeze out.  

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So, both the Euro and GFS are giving mby a quick 2 to 3 inches of snow late Tuesday night. Can I cash out my chips now???

 

It looks to me like there isn’t even  a concern with boundary layer temps.  Lower level temps quickly wetbulb below zero on both models once precip starts.  The only question is how much qpf can we squeeze out.  

 

During the Lee trough snow here in Feb the temps went from low 40s to near freezing in less than an hour.

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So, both the Euro and GFS are giving mby a quick 2 to 3 inches of snow late Tuesday night. Can I cash out my chips now???

It looks to me like there isn’t even a concern with boundary layer temps. Lower level temps quickly wetbulb below zero on both models once precip starts. The only question is how much qpf can we squeeze out.

I know right. We Upstate SC residents need to take a trip to Vegas ASAP. I need to get Bloo Q Kazoo bouncing again also.

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The euro has piqued my curiosity about next weeks setup. Even though the GFS is a whiff at the moment in comparison, 18z gives some semblance of cutoff potential at H5 around 114hrs, you can see the energy trying but it did not quite get there. 

11/8 18z@114

post-382-0-77490800-1383955029_thumb.jpg

 

11/8 0z@132

post-382-0-04280700-1383955044_thumb.jpg

 

 

Allan commented about the 150kt jet streak showing up off the NC/VA coast on twitter (on the 12z GFS), mentioned it would argue for development further west than what that particular run showed.  

 

250mb from the 18z @114

post-382-0-87504600-1383955288_thumb.jpg

 
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The atmosphere isn't even marginal. We'd kill for the sounding in 95% of the events we get.

 

 

Even down here in Atlanta the soundings are perfect for a time.

 

Sample from the 18Z GFS

 

Wednesday 12Z -

2M - 28

DP - 24

925MB  -3c

850MB -4c

500MB -23c

500-1000MB Thickness - 532

North Wind at 9MPH

Light precip falling

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