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Late February 2013 Mid-Long Range Discussion


TUweathermanDD

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I was living in western PA, where we ended up with 2 feet. I don't think I would consider it a number 1 or even 2 storm for me.  The main reasion is it seemed to go by very fast. It literally started snowing (lightly) around  dawn on a Saturday, and was pretty much over by 8 p.m. that night. It ripped snow, 2-3 inches an hour, from about noon to 8 p.m., but then shut off pretty abruptly, at least back that way. I much prefer PII in 03,  Dec. 09, or Feb 5/6 2010 where it snowed more than 24 hours. 

I am the opposite, I would much rather get 24 inches in 12 hours then 24 inches in 36 hours. 

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looks like this is a do or die storm. Both models end winter after the storm

I think things moderate for a time following this storm, but I do think there is one more major amplification of the trough into the east towards March 15-20th or so.  Of course we would need something really perfect at that point. 

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The difference in track between the GFS and Euro is a function of how they are handling the h5 setup.  Looking for a trend north on the GFS is not the idea, its all about how it handles the interaction between the h5 low diving out of Manitoba and the old H5 low over the northern Lakes.  The op euro has for 3 runs now been phasing them, pinwheeling the low to our north west then phasing it into the system, thus allowing the flow to back along the coast and get the ridging needed for this to develop further.  The GFS is keeping those systems seperate.  If they do not phase, the GFS track, or at least the idea that this wont develop in time for us, is probably right because with that low right there to our north the flow is suppressive.  I have no idea which idea is correct, but our odds for a big snow are small because even the last 3 op euro runs that did phase, only one of them did so in a way to bomb the low out in time for us.  LIke mitch pointed out, a moderate storm will not work.  The trough is great but all the cold is on the other side of the globe.  We have no arctic air to work with.  Boundary layer temps will suck.  From here on out its go big or go home, we are not likely to get a 1-3" or marginal event, we need something to bomb and give us hours of heavy precip to convectively cool the boundary layer.  The last run of the euro is pretty to look at but would be 38 and moderate rain for most of the event.  We need a solution like the euro from 2 nights ago, or yesterdays euro but shifted 200 miles west. 


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After second look I do think the 0z euro is very close... and a better run for us then the 12z.  If it was just say 50 miles north and 4 mb deeper it would be the perfect solution for us.  That is a minor adjustment for 6-7 days away.   Maybe this is just my perception, but I would much rather need a "north" trend then a "west" trend leading up to a storm.  Models are rarely correct with exact track this far out, so needing a north trend is no big deal IMHO, but a west trend means we need a faster amplification solution and that rarely works out. 

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After second look I do think the 0z euro is very close... and a better run for us then the 12z.  If it was just say 50 miles north and 4 mb deeper it would be the perfect solution for us.  That is a minor adjustment for 6-7 days away.   Maybe this is just my perception, but I would much rather need a "north" trend then a "west" trend leading up to a storm.  Models are rarely correct with exact track this far out, so needing a north trend is no big deal IMHO, but a west trend means we need a faster amplification solution and that rarely works out

 

I was thinking how ironic it was in the last two plains blizzards that we needed the 500 lows to come further east, but they ran to about Missouri and hit a brick wall.  When we need one to slow a bit, it's a steam roller.  I've come to agree with you about north vs west trends.

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After second look I do think the 0z euro is very close... and a better run for us then the 12z.  If it was just say 50 miles north and 4 mb deeper it would be the perfect solution for us.  That is a minor adjustment for 6-7 days away.   Maybe this is just my perception, but I would much rather need a "north" trend then a "west" trend leading up to a storm.  Models are rarely correct with exact track this far out, so needing a north trend is no big deal IMHO, but a west trend means we need a faster amplification solution and that rarely works out. 

euro is bouncing around it seems mainly. not sure there are any trends there.

 

0z night before last was a NW of 95 event into WV, 12z yday was a Cape May paster, 0z last night crushed ROA.

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that wxsouth map is total lol

 

social media is making forecasting a joke

 

Social Media Feedback Loop:

 

1) Find 8-day forecast of east coast storm

2) Post snowfall map

 

3) 8 days later (verification time)

  if snowstorm verifies then

   "Post on facebook noting your heroic forecast with an 8-day lead time" ....collect more followers

  endif

  if snowstorm doesn't verify then

   "Post on facebook that is was just one model solution---tell followers it was never your actual forecast"

  endif

 

4) Rinse and repeat

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On the GFS, if that ne upper low is a little further east/north, I'd say we'd be in business for the real deal.

 

The whole setup through the weekend has been wreaking havoc on the evolution of the ull diving down. 

 

The real freakout comes when when a model shows the closed low to the ne becoming a block and pushes the se cutoff low into stall  mode off of OC or thereabouts. 

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Not a single person on earth is skilled enough to know the minutia of how this storm will evolve...

 

Absolutely. The ul setup this weekend over the east has been moving all over the place on the models. Zero chance the sw can be properly resolved until we get through saturday if not sunday and even then..

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Social Media Feedback Loop:

 

1) Find 8-day forecast of east coast storm

2) Post snowfall map

 

3) 8 days later (verification time)

  if snowstorm verifies then

   "Post on facebook noting your heroic forecast with an 8-day lead time" ....collect more followers

  endif

  if snowstorm doesn't verify then

   "Post on facebook that is was just one model solution---tell followers it was never your actual forecast"

  endif

 

4) Rinse and repeat

hah, pretty much..

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yes

 

I am going with the GFS on this one...the euro bias is showing here in overamplifying...it makes perfect sense that the ULL will get out ahead....we can just hope that it trends north

 

Because it's in the realm of possibility....getting a closed ull to crawl the coast can happen here. This is exactly the type of setup that can make it happen. hl blocking stopping a 50/50ish in its tracks with a cutoff over the se. I know it's a reach and a prayer but if we are going to get a coastal crawler/staller....there are some necessary pieces already on the table. 

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