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January Banter Thread #2


WxUSAF

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Plenty of mets say it. More data is good in general I think but tons of obs plus tons more satellite data etc. may be cases where a shortwave being fully sampled changed something major but seems limited if so. Plus disaggregating from simply getting better forecasts in closing...

This times a billion.  People always equate consensus building in numerical guidance as the event nears to "better sampling" while ignoring the fact that the lead time is shorter.

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Every event is the same old circle on these boards. Not sure why dtk cares, but that's cool. 

Eh, I don't care that much if people want to throw around random anecdotes and remain ignorant.  I just figure that most weather hobbyists/enthusiasts actually want to learn how these things work.

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Eh, I don't care that much if people want to throw around random anecdotes and remain ignorant.  I just figure that most weather hobbyists/enthusiasts actually want to learn how these things work.

 

That's cool...but I've noticed teaching topics of uncertainty, guidance, and model error generally seem to be forgotten in favor of explicit model snowfall maps and deterministic qpf responses, etc.  

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Every event is the same old circle on these boards. Not sure why dtk cares, but that's cool.

Someone has to battle our urban myths.

 

 

Eh, I don't care that much if people want to throw around random anecdotes and remain ignorant.  I just figure that most weather hobbyists/enthusiasts actually want to learn how these things work.

I used to believe in the Goat Man, so I'm glad that you try to keep us straight.

Now, Cry Baby Bridge is some real sheeet.

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was looking forward to a nice day off, model watching, and weenie-ing out.  Then I remembered I have a toddler.  Finally went down for a nap.  What'd I miss?

The Parallel Euro gave us a really big scare but the operational held serve.  The admins are using the distribution terms at the pay sites to force DT to stop posting the euro snow maps and piss him off... 

 

Once he gets pissed off and leaves, Ian will be allowed to post them again.

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Kind of a disconnect between our weenie world and the CWG. They give DCA an 80% chance of <8" of snow during this event. I suspect their caution is due to the event being 96 hours away, our climatology, and the fact that the public only hears the upper range of any forecast.

Seems bearish but I'm not in the loop. :P
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It'll be interesting to see if these high precipitation amounts verify.  In 2009/2010 the NAM spit out huge amounts of snow (50" for our area).  The resolution of today's global models may be approaching the resolution the NAM had in 2009/2010.  Could that contribute to a high bias or is the NAM's high bias primarily due to its convective parameterization? 

 

or maybe we have a HECS! 

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From Mt. Holly discussion.  I don't agree with their analysis concerning consistency and model agreement. They also seem to feel that the short wave needs to be sampled better. Thought dtk might like to comment.

 

 

 

"FRIDAY THROUGH SUNDAY...THROUGH THIS PERIOD, A SURFACE LOW AND
UPPER LEVEL TROUGH WILL LIFT OUT OF THE SOUTHEASTERN U.S. TOWARDS
OUR REGION. A FEW THINGS TO NOTE WITH THIS EVENT HOWEVER, RUN TO
RUN CONSISTENCY AND MODEL AGREEMENT IS NOT VERY GOOD. THE UPPER
LEVEL TROUGH THAT WILL BE ASSOCIATED WITH THIS SYSTEM IS STILL
WELL OFF THE WEST COAST AND THUS HASN`T BEEN WELL SAMPLED BY THE
UPPER AIR NETWORK (HOPEFULLY WHEN THIS HAPPENS TUESDAY
NIGHT/WEDNESDAY WE`LL START TO SEE A BIT BETTER MODEL AGREEMENT).
ALSO COMPLICATING THE ISSUE IS THAT THERE LOOKS TO BE A SPLIT FLOW
PATTERN AHEAD OF THIS SYSTEM, WHICH CAN BE A CHALLENGING PATTERN
FOR MODELS TO RESOLVE."

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From Mt. Holly discussion.  I don't agree with their analysis concerning consistency and model agreement. They also seem to feel that the short wave needs to be sampled better. Thought dtk might like to comment.

 

 

 

"FRIDAY THROUGH SUNDAY...THROUGH THIS PERIOD, A SURFACE LOW AND

UPPER LEVEL TROUGH WILL LIFT OUT OF THE SOUTHEASTERN U.S. TOWARDS

OUR REGION. A FEW THINGS TO NOTE WITH THIS EVENT HOWEVER, RUN TO

RUN CONSISTENCY AND MODEL AGREEMENT IS NOT VERY GOOD. THE UPPER

LEVEL TROUGH THAT WILL BE ASSOCIATED WITH THIS SYSTEM IS STILL

WELL OFF THE WEST COAST AND THUS HASN`T BEEN WELL SAMPLED BY THE

UPPER AIR NETWORK (HOPEFULLY WHEN THIS HAPPENS TUESDAY

NIGHT/WEDNESDAY WE`LL START TO SEE A BIT BETTER MODEL AGREEMENT).

ALSO COMPLICATING THE ISSUE IS THAT THERE LOOKS TO BE A SPLIT FLOW

PATTERN AHEAD OF THIS SYSTEM, WHICH CAN BE A CHALLENGING PATTERN

FOR MODELS TO RESOLVE."

Thats old- from this morning. Update soon..

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My updated point and click forecast (Mount Holly) is pretty darn nice even for here, but if even if I get a foot with a period of mixed in the middle, if I can travel and get to ground zero, I think I might do it. I want to be in the middle of a historic blizzard. I am off Friday, so as long as I can make it back by Sunday night (lol), I may go for ground zero. Has to be a cool place though, with pubs I can walk to. Harpers Ferry maybe..

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Ok, tell me if you think I'm being unreasonable or a weenie.

 

I see this tweet saying "major snow is possible. All rain is possible as well" 

 

IMO, that conveys a sense that the model solutions have shown a snowy solution for DC just as often as a rainy one - which is certainly inaccurate. 

Anyone can tweet anything...why do you give a sh*t?

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Updated AFD from Mount Holly on the potential-

 

FRIDAY INTO SATURDAY...A MAJOR WINTER STORM IS LIKELY, BUT NOT YET
CERTAIN.

DETERMINISTIC DETAILS ARE IN THE FORECAST, BUT TIMING HEAVIEST PCPN,
AXIS OF HEAVIEST PCPN AND THE AMOUNTS, AS WELL AS THE RAIN SNOW
LINE AND STRONGEST WIND GUSTS ALONG THE COASTS STILL REMAIN WITH
A VARIETY OF POSSIBILITIES. THIS MESSAGE ONLY SERVES NOTICE THAT A
POTENT EVENT CONTINUES TO LOOM AND THOUGHT SHOULD BE GIVEN AS TO
MITIGATING ACTIONS SHOULD OUR FORECAST REMAIN SIMILARLY ADVERSE
WHEN ISSUED TUESDAY AND WEDNESDAY.

THE UPPER LEVEL ENERGY THAT WILL FORM THIS SYSTEM IS STILL IN THE
EASTERN PACIFIC AND THUS HASN`T BEEN WELL SAMPLED BY THE NORTH
AMERICAN UPPER AIR NETWORK (HOPEFULLY WHEN THIS HAPPENS TUESDAY
NIGHT/WEDNESDAY WE`LL START TO SEE MORE SOLID MODEL INTENSITY AND
TRACKING AGREEMENT).

THERE IS POTENTIAL FOR HEAVY PRECIPITATION, BOTH SNOW AND RAIN.
WE DONT WANT TO PLACE TOO MUCH CONFIDENCE IN AMOUNTS AND SNOW RAIN
LINES AT THIS TIME BUT WE THINK THE HIGH (70 TO 90 PCT) CONFIDENCE
WPC PROBABILITY FOR FROZEN QPF GREATER THAN 1/4 INCH IS A VERY
GOOD STARTING POINT AND ITS CONSISTENTLY EXPANDED AND INCREASED
FROM 24 HOURS AGO. THAT MEANS THE SNOW/RAIN LINE PROBABLY MIGRATING
NORTHWARD FROM THE DELMARVA SOMETIME FRIDAY NIGHT OR SATURDAY MORNING,
POSSIBLY EVEN FURTHER NORTH THAN I-95, BEFORE EVENTUALLY COLLAPSING
BACK TO THE COASTS.

NORTHEAST TO NORTH WIND GUSTS 25 TO 40 MPH...STRONGEST ALONG THE
COAST WHERE THERE IS A CHANCE FOR EVEN HIGHER GUSTS.

12Z/18 GEFS HAS -5 TO -6 850 MB ENE INFLOW SATURDAY MORNING WITH
250 WINDS -2SD AS THE FLOW 700 MB-200MB WEAKENS WITHIN THE
MODELED DEVELOPING UPPER LOW. A LARGE 200M 12 HR HFC DEVELOPS NEAR
THE CAROLINAS BY 12Z SATURDAY THEN SHIFTS EASTWARD. BY THE WAY,
IF THIS CLOSED LOW DOES NOT DEVELOP AT 500MB, A WEAKER FURTHER
SOUTH SYSTEM WOULD RESULT.

SNOW AMOUNT GRAPHICS FOR THIS STORM INCLUDING PROBABILITIES OF VARIOUS
AMOUNTS WILL NOT POST UNTIL BETWEEN 330 AND 5 AM WEDNESDAY (INCLUSIVE
THROUGH A SMALL PART OF THE STORM-DAY 3, WHICH ENDS 12Z SATURDAY).
A MORE COMPLETE SNOW FALL FORECAST PACKAGE WILL POST BETWEEN 330 PM
AND 5 PM WEDNESDAY.

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My updated point and click forecast (Mount Holly) is pretty darn nice even for here, but if even if I get a foot with a period of mixed in the middle, if I can travel and get to ground zero, I think I might do it. I want to be in the middle of a historic blizzard. I am off Friday, so as long as I can make it back by Sunday night (lol), I may go for ground zero. Has to be a cool place though, with pubs I can walk to. Harpers Ferry maybe..

Eh, that's a risk. You would need to be 100% sure before you go. Last-minute shifts and dynamics could easily move the bullseye near your backyard.

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Thats old- from this morning. Update soon..

 

Yea, I saw after posting that it was around 10am.  I feel though that the models up to that time had pretty good consistency and agreement, especially at this range.  And I really like Mt. Holly a lot.  Thanks for the updated discussion from them.

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