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January 2-3 winter storm 18z model discussion thread


REDMK6GLI

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All I can say is you are a hell of lot closer to an all out Blizzard here than a whiff . The 500MB map looks great where its coming thru the slot

there deepening aloft and the GFS is perfect 3.5 days out . When I  see this it reminds me of every other snowstorm  forecasted on the GFS  3 plus days out in NYC .

I love when the GFS runs the center out , it means i`m safe from Rain when it jobs back N and decides to join its own 500 map .

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We'll be lucky to have the northern stream energy onshore by 18z tomorrow. Usually once this is captured, the models either trend much stronger or much weaker with the overall storm. If we can see a consolidated version of today's 12z ECMWF, then I think most will be happy here. 

 

It's going to be an interesting 24 hours. 

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IMO the NAM will suffer for at least another 18-24 hours before it starts showing its ridiculous HECS solutions...

 

The GOA energy isn't even in it's grid yet. First rule of modeling is crap in equals crap out.

 

attachicon.gifScreenHunter_59 Dec. 30 18.03.png

 

I've been looking at tons of past snowstorms and the closest matches are 1/7/94 - 1/8/94, 1/25/00 and 2/3/95 - 2/4/95, based on the H5. :)

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We don't even need the low to be that close to the coast with enhanced convergence along the coastal trough

extending west from the double barreled low to our east. Hopefully, the trough axis snows work out as advertised

should the lows track this far east.

I like our odds for at least several inches of snow from this. We can get snow from the system a number of different ways and it doesn't look like an all or nothing as it did yesterday. That's definitely a good sign.

 

The GFS might still be spuriously developing a low too soon and shifting it out, and therefore the baroclinic zone as the main trough energy comes in. It's done this a number of times before. I guess it could somehow be right.

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The flow is still too fast for a major storm, and the best way to overcome that would be to dig the system further south. I don't recall too many major storms where the NAO was so flat either. 

We have a nice block in place as the storm comes in, which slows the pattern down just enough. It's not like late Dec 2010's block which was a monster, but it should still be enough. I'm liking more and more where we sit for this, I definitely don't think we get nothing, anyway.

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I like our odds for at least several inches of snow from this. We can get snow from the system a number of different ways and it doesn't look like an all or nothing as it did yesterday. That's definitely a good sign.

 

The GFS might still be spuriously developing a low too soon and shifting it out, and therefore the baroclinic zone as the main trough energy comes in. It's done this a number of times before. I guess it could somehow be right.

 

Yeah, I would probably go with a Euro ensemble mean idea now of a double-barrelled low with a trough enhancing 

convergence back to the coast. It will be interesting to see if the OP Euro continues as amped for the wind potential.

If the OP holds serve, the stronger low more tucked in further west and higher winds may pan out.

 

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18z GEFS members. All are hits

 

ef.gif

 

Member #7 there in the bottom left was pretty much the last hold out, it had nothing until this run, still a miss more or less but the first time its had a storm up the coast...you can see the slower members have a much more big storm...about 3 or so have it, overall though I think the real killer closed off scenario is not going to happen because the flow is still fairly progressive.

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Member #7 there in the bottom left was pretty much the last hold out, it had nothing until this run, still a miss more or less but the first time its had a storm up the coast...you can see the slower members have a much more big storm...about 3 or so have it, overall though I think the real killer closed off scenario is not going to happen because the flow is still fairly progressive.

 

if only we had the slightest west based block we'd be talking about the possibility of a closed off stacked low coming up the coast snowgoose

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if only we had the slightest west based block we'd be talking about the possibility of a closed off stacked low coming up the coast snowgoose

 

The bigger problem may actually be the system thats moving through NWRN Canada north of Montana and Washington as we get to days 3-4 which is pushing the western ridge East...the block up north is not all that bad, but that system wanting to push things along may be the major issue.

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if only we had the slightest west based block we'd be talking about the possibility of a closed off stacked low coming up the coast snowgoose

 

I think that the models keep this progressive and don't close off over us due to the kicker coming into the west right

behind this storm. You can see the heights really rebound over the weekend.

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The bigger problem may actually be the system thats moving through NWRN Canada north of Montana and Washington as we get to days 3-4 which is pushing the western ridge East...the block up north is not all that bad, but that system wanting to push things along may be the major issue.

 

with saying that the closing off would have to do more with what that system does in making the flow slow down or keep it progressive for no closing off

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The bigger problem may actually be the system thats moving through NWRN Canada north of Montana and Washington as we get to days 3-4 which is pushing the western ridge East...the block up north is not all that bad, but that system wanting to push things along may be the major issue.

We had something similar with the Boxing Day 2010 event-the kicker system was actually well into the Rockies by the time we were getting blitzed, and the ridge axis was actually into the Plains. The block was stronger then but I still think we can have a big event here if the trough is amplified enough. But we need to keep the solid trends today with the diving northern stream.

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We had something similar with the Boxing Day 2010 event-the kicker system was actually well into the Rockies by the time we were getting blitzed, and the ridge axis was actually into the Plains. The block was stronger then but I still think we can have a big event here if the trough is amplified enough. But we need to keep the solid trends today with the diving northern stream.

The block was much stronger. On the day the storm commenced, the AO was -2.886. A day earlier, it had been -3.827. A day later, it was still -2.532.

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We have a nice block in place as the storm comes in, which slows the pattern down just enough. It's not like late Dec 2010's block which was a monster, but it should still be enough. I'm liking more and more where we sit for this, I definitely don't think we get nothing, anyway.

...what about mixing or rain ?

we always seem to have those issues..(south shore)

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