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Possible 3/20-3/21 Coastal Storm


Zelocita Weather

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what is it showing?

Most members are split at 00z Monday between the low tracking off the Delmarva, or NC coast, however by 06z Monday most memebrs are in agreement of the low being stationed somewhere south or just south east of Long Island... It's just a timing issue between members IMO

Edit: also both the mean/control have accumulating snow, the control dropped 10+ area wide with higher amounts in extreme LHV

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OKX is stating models are coming together putting it at the 40/70 benchmark with cold air in place... 

Wife and I booked our trip back to Greece yesterday...  snow is the last thing on my mind.  Winter's last hurrah on the first day of Spring would be okay with me though.  :)  For one day.

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Although nam is still out of range, it shows a near perfect blocking signal over Ontario area, which will be an important feature to watch as to what happens west of the LP

To me the most important feature is the 50/50 low and how quickly it escapes to the NE. We need it to get out of the way in time so heights can rise on the EC to get this storm to come up the coast.

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We would also need the western ridge to stay intacted

I've learned so much from this board over the years. And I've learned that shorter wave lengths in March mean we don't really need a stout western ridge. I think Don S posted a comparison last season about a negative PNA vs a positive PNA for March snowstorms in our area if anyone wants to dig it up. With that said, in this particular case we do need the western ridge IMO.

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What kind of consistency are you expecting from an operational model at 100+ hours?

I simply stated no consistency between the model runs. I never said I was expecting a full force blizzard every model run till the 21st expecting anything from it, quit the bs..

I wasn't born yesterday I know models will flip around this far out.

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I simply stated no consistency between the model runs. I never said I was expecting a full force blizzard every model run till the 21st expecting anything from it, quit the bs..

I wasn't born yesterday I know models will flip around this far out.

 

And I wholeheartedly disagree. It was a 75-100 mile difference at the surface at 100+ hours out, and both 12z and 18z were within the spread of the 12z GEFS. Solutions don't lock in at 100 hours out.

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no one knows for sure what happened to the 18Z GFS OP - a telling sign will be if the GEFS holds on to the 12Z ideas or not - to fully analyse what might have happened a MET would have to see exactly what data was fed into it and how it differed from 12Z and if any of the same data was missing for whatever reason  - very complex.........

 

heh, what?

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read this -- http://www.onthesnow.com/news/a/584862/how-do-weather-models-work-

The weather models do not produce perfect forecasts, mainly for two reasons. The first reason is related to the old adage “garbage in, garbage out.” If the data we feed into the weather models is wrong, than the forecast will be wrong.

Which is it? Bad data or convective feedback? 2 totally different issues. It doesn't look convective feedback to me, you normally see double barreled low structures or multiple lows when it does that. And what would you consider "bad" data?
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dude, lol

 

You think that someone should go and analyze the tens of thousands of observational inputs that were used to initialize a particular run and compare them to the tens of thousands of observational inputs used to initialize the prior run, and see what the differences are, and use that to determine why the latest run moved 75 miles at day 4.5?

 

what?

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no one knows for sure unless we get official word from the folks in charge of running the models ...........the data fed into it was different then what was fed into it at 12Z

 

They do monitor the observational data for critical quantity shortages, you can see it here http://www.nco.ncep.noaa.gov/pmb/nwprod/realtime/gfs/t18z/index.shtml.

 

But as far as the data being different...of course it's different. It's new.

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