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Jan 25th Winter Weather Discussion Thread


Marion_NC_WX

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SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/
...AS OF 310 AM WEDNESDAY.

...A FADING POTENTIAL OF A WINTERY MIX FRIDAY INTO FRIDAY NIGHT?

VERY COLD AIR IN PLACE... SYSTEM MAY SHEAR OUT TOO MUCH TO DELIVER
SIGNIFICANT PRECIPITATION...

THE LATEST MODELS CONTINUE TO TREND COLDER AND EVEN DRIER NOW THAN
IN PREVIOUS RUNS WITH REGARDS TO THE POTENTIAL WINTER WEATHER EVENT
FRIDAY INTO FRIDAY NIGHT. AT LEAST TWO OF THE OPERATIONAL MODELS
(GFS AND NAM) ARE NOW FORECASTING LESS THAN 0.05 OF QPF. OTHER
MODELS AND ENSEMBLE MEMBERS CONTINUE TO INDICATE JUST ENOUGH QPF TO
DELIVER WINTER P-TYPE PROBLEMS FOR OUR REGION. THE LATEST EC STILL
FORECASTS AROUND 0.25 LIQUID FOR OUR NW ZONES... TAILING OFF TO
AROUND 0.10 IN THE SE. HOWEVER... THE DRIER TRENDS WITH THE 00Z
MODEL SUITE ARE CERTAINLY THE HEADLINER. IF THESE TRENDS
CONTINUE...THEN CENTRAL NC WOULD HAVE VERY LITTLE IMPACT FROM THIS
EVENT.

WE WILL CONTINUE TO LEAVE OUR CURRENT FORECAST OF A POTENTIAL WINTER
WEATHER ADVISORY EVENT FOR FRI AND FRI EVENING... ESPECIALLY IN THE
AREAS CURRENTLY MENTIONED IN THE HAZARDOUS WEATHER OUTLOOK.

THE ARCTIC (VERY DRY) AIR MASS IS FORECAST TO BE IN PLACE THURSDAY
NIGHT INTO EARLY FRIDAY DRIVEN BY A 1035+ MB SURFACE HIGH THAT
BUILDS DOWN THE EASTERN SEABOARD FROM PA/NY. DEW POINTS ARE FORECAST
TO BE IN THE 0-10 RANGE AT 12Z/FRIDAY WITH TEMPERATURES BETWEEN
15-20 ACROSS CENTRAL NC. THIS SETS THE STAGE FOR THE POTENTIAL LIGHT
WINTERY MIXTURE FOR FRIDAY AND FRIDAY NIGHT. HPC HAS BEEN LEANING
TOWARD A DRIER FORECAST GIVEN THE TRENDS IN THE MODELS... BUT STILL
LEANS TOWARD A BLEND OF THE GEFS MEANS AND THE OPERATION EC.
VIRTUALLY ALL MODEL SOLUTIONS SHEAR OUT THIS SYSTEM AND WEAKEN IT
CONSIDERABLY AS IT MOVES ACROSS THE APPALACHIANS TO THE EASTERN
SEABOARD FRIDAY INTO FRIDAY EVENING. GIVEN THE EXTENSIVE VERY DRY
AIR IN PLACE... IT MAY BE DIFFICULT TO OVERCOME THE NOW WEAKER LIFT
TO GENERATE QPF. THE LIGHTER QPF AND DRIER MOISTURE PROFILE ALSO
AFFECTS THE P-TYPE SOMEWHAT... AS SOME MODELS SUGGEST INADEQUATE
MOISTURE IN THE ICE NUCLEATION REGION FOR SNOW. THE LIGHTER
PRECIPITATION WOULD LIKELY BE LIGHT SLEET OR LIGHT FREEZING
RAIN/RAIN DEPENDING ON THE SURFACE TEMPS FRIDAY. IN ADDITION...
THERE IS CONSIDERABLE EVAPORATIVE COOLING POTENTIAL... BUT LACK OF
QPF WOULD MEAN LESS COOLING ALLOWING SURFACE TEMPERATURES TO
POSSIBLY GO ABOVE 32 FRIDAY. HOWEVER... COLD AIR IS NOT AN ISSUE...
BUT VERY DRY AIR AND A MORE SHEARED SYSTEM ALONG WITH LESS MOISTURE
ARE BIG ISSUES.

Can we delete the thread yet?

They didn't see the 6z runs. Big difference as far as QPF. Also data from pacific recon won't be ingested until 12z, possibly 0z runs later tonight... Something to keep in mind.
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SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...AS OF 310 AM WEDNESDAY....A FADING POTENTIAL OF A WINTERY MIX FRIDAY INTO FRIDAY NIGHT?VERY COLD AIR IN PLACE... SYSTEM MAY SHEAR OUT TOO MUCH TO DELIVERSIGNIFICANT PRECIPITATION...THE LATEST MODELS CONTINUE TO TREND COLDER AND EVEN DRIER NOW THANIN PREVIOUS RUNS WITH REGARDS TO THE POTENTIAL WINTER WEATHER EVENTFRIDAY INTO FRIDAY NIGHT. AT LEAST TWO OF THE OPERATIONAL MODELS(GFS AND NAM) ARE NOW FORECASTING LESS THAN 0.05 OF QPF. OTHERMODELS AND ENSEMBLE MEMBERS CONTINUE TO INDICATE JUST ENOUGH QPF TODELIVER WINTER P-TYPE PROBLEMS FOR OUR REGION. THE LATEST EC STILLFORECASTS AROUND 0.25 LIQUID FOR OUR NW ZONES... TAILING OFF TOAROUND 0.10 IN THE SE. HOWEVER... THE DRIER TRENDS WITH THE 00ZMODEL SUITE ARE CERTAINLY THE HEADLINER. IF THESE TRENDSCONTINUE...THEN CENTRAL NC WOULD HAVE VERY LITTLE IMPACT FROM THISEVENT.

 

The story of our lives with winter here. Either wet and too warm, or cold and too dry. This is exactly why I hate when it gets really cold here, because often it is just dry. Maybe things will change today and tomorrow, though. I guess the good thing is if we get the cold now it could set the foundation for a real winter storm to come a little later down the road when it's cold enough for snow, but not so cold that there is no precip around.

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It's dubious to rely on the NAM for QPF totals, especially for this range. It's infamous for overdoing precip amounts. I would like to see the GFS come in wetter before I would feel better about this.

 

Me too, although it's wetter in ga obviously.

 

FWIW, here is HPC's totals. Surprised to see them show nearly half inch amounts in north ga. Now most are 0.25 are greater on their maps and considering I expect temps to stay below freezing for most if not the entire duration of precip over the 85 corridor from the ne burbs of atlanta , gainesville, hartwell, toccoa, and probably here too, etc...that would actually mean a rather significant amount of freezing rain above the 85 corridor (going by their maps)..with decent amounts, 0.25, in places like athens, winder, here, etc.

 

I think they might be a bit over done but those markers near a half inch are close to gainesville where i see it staying subfreezing most of the time.. Still don't see much in the way of sleet (I don't see any snow falling right now) and if the sleet is there, it shouldn't last but an hour or two as the atmosphere saturates..which means the majority of this is indeed freezing rain.

 

Unless the models come in wetter today, I don't expect them to forecast totals this high. 0.20 to 0.25 is more realistic to me but 0.40 to 0.50 is a stretch right now based on the modeling as it currently stands imo.

 

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he made three post about it yesterday as im sure he was getting nervous thst the trend was south of dc.

Shocking. Other than maybe glenn motherf'n burns out of atlanta, he's easily my least favorite forecaster. Between his hype and bias, he's just so damn annoying.

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The story of our lives with winter here. Either wet and too warm, or cold and too dry. This is exactly why I hate when it gets really cold here, because often it is just dry. Maybe things will change today and tomorrow, though. I guess the good thing is if we get the cold now it could set the foundation for a real winter storm to come a little later down the road when it's cold enough for snow, but not so cold that there is no precip around.

Dryer for you, icier for us. 

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I love you man, but you can be the worse Kill joy.. Did you not get like 4" hour rates on a trip this year :)

Now where is my .0001 of ice :)

 

 

2" per hour :) You have to understand my sarcasm (not easily conveyed through a computer screen). I was half joking there. I love winter wx obviously and nobody likes a potential letdown no matter what. You are correct though I have much less of a right to complain.

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GSP's latest disco mentions a half inch to an inch of wintry precip.  :blink: I haven't been impressed due to the dry airmass, honestly, but dang. If even half that is before the changeover then we'll be in a mess as if Friday afternoon between 13z and 18z isn't bad enough to drive in already.

**Also, I have had an issue with them lately about their discos. Never know exactly where they're talking about. CFA tells me nothing except it's somewhere between TN and the Atlantic.**

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GSP's latest disco mentions a half inch to an inch of wintry precip.  :blink: I haven't been impressed due to the dry airmass, honestly, but dang. If even half that is before the changeover then we'll be in a mess as if Friday afternoon between 13z and 18z isn't bad enough to drive in already.

**Also, I have had an issue with them lately about their discos. Never know exactly where they're talking about. CFA tells me nothing except it's somewhere between TN and the Atlantic.**

 

Yeah, a lot of folks are concerned about the low amounts of qpf. If it is all snow, it might not be as bad, but if it is ice it could be a whole other story. Whatever falls is going to stick on the roads fast with the cold we have this week. It doesn't take that much ice on the roads to cause havoc.

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The meteogram shows the potential trouble for anything wintry to fall in Hickory (and most of the NW piedmont of NC, for that matter).  Of the American models, only the NAM is showing any significant precipitation, no matter the type.  A positive is that the 06Z has now trended wetter than the 00Z, but the NAM didn't do that great on precipitation amounts from last Friday's storm.  The 06Z GFS also trended wetter (by 100%!), but does it really matter when you move from 0.01 inch to 0.02 inch?

 

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2" per hour :) You have to understand my sarcasm (not easily conveyed through a computer screen). I was half joking there. I love winter wx obviously and nobody likes a potential letdown no matter what. You are correct though I have much less of a right to complain.

I knew you were being sarcastic and joking and I'm pretty sure he did too ;)

 

And we were too lol

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HPC

 

 

THE FORECAST APPROACH IS CONSISTENT WITH PRIOR ISSUANCES...WHICHIS FAVORING AN INTERMEDIATE SOLUTION INVOLVING THE STRONGER ECMWFAND WEAKER GFS...WHILE EXCLUDING THE SOLUTIONS FURTHEST FROM THECONSENSUS...I.E. THE NAM/UKMET...UNTIL THE SHORTWAVE TROUGH INQUESTION CURRENTLY OVER THE EASTERN PACIFIC MOVES INLAND AND CANBECOME MORE THOROUGHLY SAMPLED FOR IMPROVED MODEL INITIALIZATION. THEREFORE...UNTIL THIS OCCURS CONFIDENCE IN THE PARTICULAR DETAILSIS LESS THAN IDEAL.
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HPC

 

 

THE FORECAST APPROACH IS CONSISTENT WITH PRIOR ISSUANCES...WHICHIS FAVORING AN INTERMEDIATE SOLUTION INVOLVING THE STRONGER ECMWFAND WEAKER GFS...WHILE EXCLUDING THE SOLUTIONS FURTHEST FROM THECONSENSUS...I.E. THE NAM/UKMET...UNTIL THE SHORTWAVE TROUGH INQUESTION CURRENTLY OVER THE EASTERN PACIFIC MOVES INLAND AND CANBECOME MORE THOROUGHLY SAMPLED FOR IMPROVED MODEL INITIALIZATION. THEREFORE...UNTIL THIS OCCURS CONFIDENCE IN THE PARTICULAR DETAILSIS LESS THAN IDEAL.

 

Sounds like the smart approach since we really don't know what will happen yet. When will the models get to sample that shortwave?

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I expect to see some watches very soon, warnings not too far after. We're within 48 hours for some of us.

 

Hey guys, I have not posted much, just been lurking.  

 

Glad to see NE GA folks are finally having some winter wx to talk about.

 

Started a new job so can't post much.

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Sounds like the smart approach since we really don't know what will happen yet. When will the models get to sample that shortwave?

 

I just can't get into this thing.  I'm hoping, but looking at the logistics it just never works.  It's a clipper, it's coming from the west over the mountains, it's got no gulf moisture, the air in place is bone dry, the models are VERY sheepish on precip.  Hopefully Georgia will cash in on a nice slizzard, but if CLT gets a pellet or two to fall I'll consider this an overperformer. 

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Sounds like the smart approach since we really don't know what will happen yet. When will the models get to sample that shortwave?

 

I believe the energy has already been tapped - maybe well see it in the evening run...

 

I just can't get into this thing.  I'm hoping, but looking at the logistics it just never works.  It's a clipper, it's coming from the west over the mountains, it's got no gulf moisture, the air in place is bone dry, the models are VERY sheepish on precip.  Hopefully Georgia will cash in on a nice slizzard, but if CLT gets a pellet or two to fall I'll consider this an overperformer. 

 

I just don't see it either.  The only way I'll buy this system is if I slip and bust my *** on it as I leave the house Saturday morning.  Clipper type energy does not translate well on the extreme east side of the apps in the Upstate (NC is a different story).

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