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Discussion-OBS snow event sometime between 06z Thu 2/20-12z Fri 2/21?


wdrag
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1 minute ago, nycsnow said:

My god brutal…. If this happens I hope it keeps going south 

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A chunk of E NC and S VA/Delmarva might end with more snow than NYC this year and maybe a good amount more. When was the last time that happened, 1979-80 which was a Nino? I think 12z tomorrow is the final pull the plug, right now it’s on life support getting every AED given to it in the building. 

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1 minute ago, nycsnow said:

I want a trend back Tom or it to keep going south til no one gets snow 

If you get a trend back from Icon it will probably be 6-12 hours prior to the onset of snow (if there is any). Icon is not one of the top tier models. ECMWF is still the best, GGEM very good, UKMET good. I'd look for changes in one of those three models to signal a reverse in trends if it is to be. Icon and GFS would not be first to the punch bowl.

WX/PT

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Storms will oftentimes “come back” on modeling when there’s an impetus to. Jan 2016 was one of the biggest examples of that. In that case, the confluence was just being depicted too strongly. But here, the ULL continues to be depicted too far east and running out ahead of the SW, kicking it off the shore without gaining latitude. Unless that ULL aligns with the SW, there will be minimal impacts for anyone in the Northeast, if any snow at all. Considering we are 3 days away from the “storm” we have sufficiently run out of time. 

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3 minutes ago, allgame830 said:

Well what do you possibly see as a result for this to come back? You seem from the past to be conservative  but you must see something 

My gut feeling right now is that it probably won't come back but I cannot draw that conclusion absolutely for a few more run cycles, probably 12Z tomorrow and 00Z Tuesday. At the moment all we have for hope is the NAM (which is not much) and a few outlier ensemble members. Everything else is a "not happening" and in the last 8 hours has been getting worse, not better. But in the passed we have sometimes seen an unexpected reversal  in trends within the last 72 hours. So I wait until tomorrow night or Tuesday 12Z to sound the "all clear". 

WX/PT

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1 minute ago, MJO812 said:

Rgem is well south . This is becoming a piece of shit storm. Another storm where it deamplifies at the last minute. We can't get a phased storm this winter .

It’s being destructively interfered with by confluence to the north and a kicker to the west. So actually a double whammy against this one. Maybe these pieces can move around or weaken but time’s running short. 

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4 minutes ago, Franklin0529 said:

GFS is South. It's over. Theme of the winter, suppression depression. Weak strung out piece of crap storms

That’s all the background state supported. Rule of thumb, if you don’t see a big storm by late January, you probably won’t see one all season. The two systems in early Jan that hit mid Atlantic were suppressed, and then the south cashed in, and then we have had a few slop storms. Why bet against the way this winter has gone, just because of pretty looking storm maps? I think everyone learned their lesson after this one

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