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Winter 2011-2012 Kickoff Thread | December 2011


earthlight

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this is a progessive pattern with basically no opportunity for amplification.

There is room only because of the ridge out west around 60-72 hours. This feature deamplifies eventually but the shortwave is also related to the Polar Vortex. This feature has been trending more amplified for four model cycles now. It swings southeast and on the OP GFS does absolutely nothing.

http://www.meteo.psu.edu/~gadomski/AVN_12z/f60.gif

There is a window of opportunity that the GEFS at 06z were picking up on. With the new 12z GEFS more amplified, you'd think another member or two has the storm now as well.

http://www.meteo.psu.edu/~gadomski/ENSPRSNE_6z/f108.gif

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There is room only because of the ridge out west around 60-72 hours. This feature deamplifies eventually but the shortwave is also related to the Polar Vortex. This feature has been trending more amplified for four model cycles now. It swings southeast and on the OP GFS does absolutely nothing.

http://www.meteo.psu...AVN_12z/f60.gif

There is a window of opportunity that the GEFS at 06z were picking up on. With the new 12z GEFS more amplified, you'd think another member or two has the storm now as well.

http://www.meteo.psu...SNE_6z/f108.gif

problem is as soon as the ridge goes up, it gets beat back down. Need that ridge to stay amplified, and right now, not seeing it. Also, look behind that wave, ugly for a while.

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yes, that is how atwon, abc, and metfan do their calculations.

Not the people you want to cheat off of.

First of all it is spelled Atown...

Second of all.. I believe i was the one who was saying that this was going to come further west from the start...and I also said that it was going to be an interior rain changing to snow with light to moderate accumulations possible with the potential for it to change to snow in the back end of the system in the bigger cities..And pretty much that seems to be the case....

Or are you continuing to look at something else?

So before you go talking about a person i suggest you know what the person has been saying since day one about this system which is now the same thing CONSISTENTLY said for the last 7-10 days...

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Heads up

I wouldn't be surprised if the other models begin to pick up on it tonight or tomorrow...GFS tries to form something but way offshore...something to watch...but playing the odds...Saturday morning has a considerably better shot at being white than Thursday out east...

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I wouldn't be surprised if the other models begin to pick up on it tonight or tomorrow...GFS tries to form something but way offshore...something to watch...but playing the odds...Saturday morning has a considerably better shot at being white than Thursday out east...

We need one of the models to discover a shortwave in the fast flow over the Northwest Territories around 24hrs out, send it south through Saskatchewan at 48hrs, through the Dakotas at 60hr and into southern Missouri by day 3. Even a modest s/w should amplify the flow significantly in the temperature gradient that will exist across the South and Southeast. Then amplify it like crazy, just like with Thursday's wave... but not so much that it sends the 564dm line up into Maine. Because that's getting kind of old.

Then longwave pattern would support it, and I've been squinting my eyes to find any sign of a squiggle up in NW Canada on the 500mb charts. But I just can't see one.

I suspect it's a very data sparse region. Shortwaves can sometimes materialize out of thin air up there. The sparse data weenieism is one that I can still trick myself into believing sometimes.

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For the Day 4 threat I think we need to see the 300mb jet penetrate further south into the central US. Otherwise we will likely end up with a Great Lakes primary low and/or a late developing coastal into the Canadian Maritimes.

As it is right now (modeled on the OP run) it is pretty crappy...with the NAM being better than the GFS. That being said, some of the GFS Ensembles still are developing significant low pressure systems (a few of them earlier today wrapped them up big time over the Northeast US)...so I wouldn't say the threat is anywhere near dead yet.

In such a bad pattern..it's something to watch. These things can often go under the radar for a while up till the last minute. It's def. a very long shot though.

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As it is right now (modeled on the OP run) it is pretty crappy...with the NAM being better than the GFS. That being said, some of the GFS Ensembles still are developing significant low pressure systems (a few of them earlier today wrapped them up big time over the Northeast US)...so I wouldn't say the threat is anywhere near dead yet.

In such a bad pattern..it's something to watch. These things can often go under the radar for a while up till the last minute. It's def. a very long shot though.

The D4 "threat" is a horrendous setup...it might clip SNE with 33F wet snow...but overall that pattern sucks. Maybe someone gets lucky in the interior with 0.5" of qpf and snow which might mean 3-5" of paste. But overall its looks awful....mostly interior sne threat...maybe interior SE NY and NNJ if it trends west...but you'd want to be at >700 feet probably.

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