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Mid to long range discussion- 2025


wncsnow
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1 hour ago, NorthHillsWx said:

Euro is over 24 hours straight of nonstop freezing rain and temps in the 20s for here… that would be catastrophic being our trees haven’t been tested by ice in 20 years

Feb 2014 had back-to-back storms that I'd argue gave moderate tree damage in the CAD favored areas b/t Triad and Triangle. I know in Burlington - we had a 4-day power outage with the first storm if memory serves me. Noted - Wake and immediate areas avoided these.

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Looking at the HP placement on the Euro, man it’s close. We can historically make a strong HP over Iowa work, at least in the CAD region but any nudge east would do us some huge favors. You can see it scooting east a bit just in time to save the day but timing timing timing.

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The Euro AI has not been good overall this winter imo as I just posted. It especially blew the most recent storm’s snowfall, way overdoing it with 850 0C line way too far south and thus having historic snow amounts way far south of the actual snow line (though Stormvista snow maps likely overdid the amounts somewhat). So, I’m taking this very SE suppressed 12Z Euro AI with a gigantic grain at this point:

IMG_2952.thumb.gif.478ce378310c87bdfd053510bf5bf13f.gif

 

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3 minutes ago, GaWx said:

The Euro AI has not been good overall this winter imo as I just posted. It especially blew the most recent storm’s snowfall, way overdoing it with 850 0C line way too far south and thus having historic snow amounts way far south of the actual snow line. So, I’m taking this very suppressed 12Z Euro AI with a gigantic grain at this point:

IMG_2952.thumb.gif.478ce378310c87bdfd053510bf5bf13f.gif

 

I thought it had good verification scores.  This would be range dependent though. 3-5days?

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18 minutes ago, CaryWx said:

I thought it had good verification scores.  This would be range dependent though. 3-5days?

 1) As just mentioned it had very heavy (historic in some cases) snow on several runs in a row very far to the south (as far S as NE GA, upstate SC) for earlier this week, for example. However, to be fair, those runs were further out than 5 days.

2) For the Jan 10-11 storm, it had warming S winds ahead of the N Gulf low on the backside of the high moving offshore and ahead of a Clipper. That hardly ever happens. It ended up dead wrong at the surface.

3) I’m not disputing what you’re saying, but I don’t know exactly what you’re referring to and what exactly the verification measures. It could have been an H5 verification for all I know. The main problems may lie underneath 500 mb. Do you have a link or can you post the graphics?

4) I’m not saying it couldn’t end up right with the very suppressed track. With the preceding -5 AO, it could occur despite La Niña. What I’m saying is I’m taking it with a huge grain while it is on its own.

5) Are you favoring this very suppressed track?

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4 minutes ago, GaWx said:

 1) As just mentioned it had very heavy (historic in some cases) snow on several runs in a row very far to the south (as far S as NE GA, upstate SC) for earlier this week, for example. 

2) For the Jan 10-11 storm, it had warming S winds ahead of the N Gulf low on the backside of the high moving offshore and ahead of a Clipper. That hardly ever happens. It ended up dead wrong at the surface.

3) I’m not disputing what you’re saying, but I don’t know exactly what you’re referring to and what exactly the verification measures. It could have been an H5 verification for all I know. The main problems may lie underneath 500 mb. Do you have a link or can you post the graphics?

4) I’m not saying it couldn’t end up right with the very suppressed track. With the preceding -5 AO, it could occur. What I’m saying is I’m taking it with a huge grain while it is on its own.

5) Are you favoring this very suppressed track?

I don't have specifics but I've seen charts posted where it is rated pretty well. You are correct in 'what are the specifics it scores well in?' and at what range (which I mentioned here)

No, I do not see a suppressed track verifying.  I do suspect a further north (Va) centralized placement with this storm.  Just been the case this season.  All anecdotal thinking for sure, but wouldn't surprise me in the end. 

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56 minutes ago, CaryWx said:

I don't have specifics but I've seen charts posted where it is rated pretty well. You are correct in 'what are the specifics it scores well in?' and at what range (which I mentioned here)

No, I do not see a suppressed track verifying.  I do suspect a further north (Va) centralized placement with this storm.  Just been the case this season.  All anecdotal thinking for sure, but wouldn't surprise me in the end. 

 Yes, to be fair, those historic Euro AI snow maps were for when this week’s activity was 8-9 days out. Now we’re within 6 days. So, perhaps those too cold misses (including way too cold 850s) aren’t as relevant now. Also, I now realize that the S portion of StormVista snow maps have to be added to the non trusted snowfall map list. So, a portion (not all and probably not even most) of the overdoing of snow on the insane SV Euro AI maps may have been due to SV algos. But regardless, the 0C 850/snow line verified way too far S.

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0Z GEFS (see below) and other models remain insistent on a rare sub -5 AO tomorrow. Today’s preliminary is already down to -4.8. There have been only 12 such periods since 1950 (average of once every 6 years). In Feb, itself, there’s only been 4 periods of sub -5 (one every 15 Febs on average):

 

-2/10-11/2021 (only La Niña Feb instance): major GSO icestorm 2 days later

-2/6-7, 14/2010 (El Nino): 2 SE US winter storms (2/5, 2/12-13)

-2/5-6/1978 (El Nino): several SE light snows 2/2-9

-2/13-16/1969 (El Nino): major winter storm 2/15-17 Charlotte to Asheville to GSP

Today’s 0Z GEFS based AO forecast:

IMG_2941.thumb.png.391be8de7fc61ffdec4572e663e78848.png

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8 minutes ago, GaWx said:

0Z GEFS (see below) and other models remain insistent on a rare sub -5 AO tomorrow. Today’s preliminary is already down to -4.8. There have been only 12 such periods since 1950 (average of once every 6 years). In Feb, itself, there’s only been 4 periods of sub -5 (one every 15 Febs on average):

 

-2/10-11/2021 (only La Niña Feb instance): major GSO icestorm 2 days later

-2/6-7, 14/2010 (El Nino): 2 SE US winter storms (2/5, 2/12-13)

-2/5-6/1978 (El Nino): several SE light snows 2/2-9

-2/13-16/1969 (El Nino): major winter storm 2/15-17 Charlotte to Asheville to GSP

Today’s 0Z GEFS based AO forecast:

IMG_2941.thumb.png.391be8de7fc61ffdec4572e663e78848.png

It's going to shoot up quick that's for sure! 

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12Z Euro AI way colder/further SE 850 0C line than other models (hour 126, which is as of 18Z on Feb 19th):

Fayetteville to Gainesville:

IMG_2955.thumb.png.4309f7631827e68f1da9624b2e1d0c82.png


12Z Euro op: N of RDU to TN

IMG_2957.thumb.png.77fc11df47649131207cd12d112cce79.png

 

12Z GFS: S VA to TN

IMG_2958.thumb.png.88ee41ed3dee49903894aa4daf568f7a.png
 

12Z CMC: S VA to TN

IMG_2959.thumb.png.3c1e52d43378e389dc45647ee09c22cf.png

12Z Icon: S VA to TNIMG_2956.thumb.png.72471754314de4786db57d9e6abfccdd.png

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