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February Medium/Long Range Disco


WinterWxLuvr

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In late December 1990, there was a decent thump snow and I believe (not near my source right now), it had a setup kind of similar to what's being modeled for late next week. How do you all feel about that comparison?

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In late December 1990, there was a decent thump snow and I believe (not near my source right now), it had a setup kind of similar to what's being modeled for late next week. How do you all feel about that comparison?

i remember that storm....i think Dec 27. We got about 3-4 inches. It was a nice event. I dont remember the setup though

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i remember that storm....i think Dec 27. We got about 3-4 inches. It was a nice event. I dont remember the setup though

Here are the EWALL links. The idea of the CONUS 500mb map being so unconventional for a snowstorm interested me, and I remember feeling the same way about 1990.

http://www.meteo.psu.edu/~fxg1/NARR/1990/us1227.php

http://www.meteo.psu.edu/~fxg1/NARR/1990/us1228.php

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I try not to post wxbell stuff so delete if necessary. I just think this is an important point. 

 

@ hr 186 on both the euro and gfs, height patterns over the ne us and labrador are remarkably similar. It's near perfect placement of strong confluence. I'm not sure I remember these 2 models looking so similar at long leads like this. That feature is make or break for us (along with timing issues of course). 

 

Euro has sped up the vort progressing in the SW. This combined with the feature I just pointed out is most of the reason why it was such a nice run. Usually the euro is slower with vorts in the SW because of its bias so I consider the faster timing of the recent run a big + in the overall scheme. 

 

If the storm slows down we can easily end up with a miller B or straight up runner/cutter. However, the area of confluence is pretty strong and stable for a couple days. 

 

post-2035-0-85354300-1391113660_thumb.jp

 

 

post-2035-0-14009200-1391113678_thumb.jp

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Euro ensembles look excellent. 6hr precip panels say there is quite a bit of support for the op. I don't think there are many n-w tracks on the members. Lowest slp on the means is along the coast. Maybe someone else can chime in with SV data. From what I'm seeing, an oh valley track is in the minority by quite a bit. 

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Here are the EWALL links. The idea of the CONUS 500mb map being so unconventional for a snowstorm interested me, and I remember feeling the same way about 1990.

http://www.meteo.psu.edu/~fxg1/NARR/1990/us1227.php

http://www.meteo.psu.edu/~fxg1/NARR/1990/us1228.php

 

yeah..it was a decent WAA event here...3-5" though well NW of town got 8-12"...flipped to ZR at the end...

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Euro ensembles look excellent. 6hr precip panels say there is quite a bit of support for the op. I don't think there are many n-w tracks on the members. Lowest slp on the means is along the coast. Maybe someone else can chime in with SV data. From what I'm seeing, an oh valley track is in the minority by quite a bit. 

 

the mean is slightly warmer and further west than the OP but for a mean that far out it is a liquid bomb

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Finally, 1994 made the 6-10 day CPC analog list. As for 8-14 day, it has come waaay up from yesterday...
http://www.cpc.ncep.noaa.gov/products/predictions/610day/610analog.off.gif
http://www.cpc.ncep.noaa.gov/products/predictions/814day/814analog.off.gif

As for 1990, yeah late next week could have a colder air mass to work with than 12/90. The point of the analog, I guess, is to show at least some precedent here.

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Finally, 1994 made the 6-10 day CPC analog list. As for 8-14 day, it has come waaay up from yesterday...

http://www.cpc.ncep.noaa.gov/products/predictions/610day/610analog.off.gif

http://www.cpc.ncep.noaa.gov/products/predictions/814day/814analog.off.gif

As for 1990, yeah late next week could have a colder air mass to work with than 12/90. The point of the analog, I guess, is to show at least some precedent here.

 

2 of my euro analogs are 2/2/96 and PD1...lol...though they aren't near the top of the list

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2 of my euro analogs are 2/2/96 and PD1...lol...though they aren't near the top of the list

 

If the PV were to stick around and become intimately involved, 2/2 wouldn't be so bad...but yeah...lol.

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If the PV were to stick around and become intimately involved, 2/2 wouldn't be so bad...but yeah...lol.

 

Interestingly, this year is in between these two extreme storm dates. PD1 had extreme separation so that confluence could linger in Canada and underneath that the s/w could go negatively tilted. It was almost a spring-like s/w because of this separation. In 1996, the PV was very much involved in the dynamic.

 

On the modeling today, the southern wave comes out and partially interacts with the PV but stays separated enough out ahead, ending up between 2 PVs. Hmmm...

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