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Winter 2013-14 Pattern Discussion II


buckeyefan1

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 Folks,

 Fwiw, per 6Z GFS per MeteoStar: major, very long lasting, and widespread winter storm for much of SE US (even down to Charleston as major ZR and a little wintry precip. Savannah) 1/26-early 1/29. Snow is mainly in NC but also far N GA/SC. Below that is a major IP and ZR in much of NC/SC/N and C GA. KATL gets nearly 48 hours (1/27-8) of mainly ZR, probably some IP, and some S at the end. Neutral negative ENSO climo means enhanced probabilities for major ZR N GA late January as has been mentioned several times. KATL gets ~1" of mainly ZR (probably with some IP) and then a little snow at the end. Lows back into single digits following this big mess!

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I like where the models are going with the configuration of the E Pac ridge by Day 10 and beyond.  GFS forms a strong omega block which will start up a split flow pattern with a parade of low pressure systems moving across with cold pressing overhead.  Perfect overrunning pattern.

 

No "big" single system.. no -NAO to slow down everything but it would be epic nonetheless with multiple systems moving through over days.

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I like where the models are going with the configuration of the E Pac ridge by Day 10 and beyond.  GFS forms a strong omega block which will start up a split flow pattern with a parade of low pressure systems moving across with cold pressing overhead.  Perfect overrunning pattern.

 

No "big" single system.. no -NAO to slow down everything but it would be epic nonetheless with multiple systems moving through over days.

 

The last week of January sounds like it could be a lot of fun. I think most folks would gladly take a bunch of smaller systems back to back if we can't get one big system. I just wish it wasn't so far away!

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I like where the models are going with the configuration of the E Pac ridge by Day 10 and beyond.  GFS forms a strong omega block which will start up a split flow pattern with a parade of low pressure systems moving across with cold pressing overhead.  Perfect overrunning pattern.

 

No "big" single system.. no -NAO to slow down everything but it would be epic nonetheless with multiple systems moving through over days.

 

Whatever it is, it seems the cold locks in and energy just keeps coming.  Snow's not necessarily modeled over and over, but it's in close proximity to the SE each time.  It looks like we're in the ballgame, rather than having it warm up each time precip approaches.  Nice change from what we've seen. 

 

I'd like to see this split flow pattern modeled about a week closer and I'll start to feel better about it. 

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 Folks,

 Fwiw, per 6Z GFS per MeteoStar: major, very long lasting, and widespread winter storm for much of SE US (even down to Charleston as major ZR and a little wintry precip. Savannah) 1/26-early 1/29. Snow is mainly in NC but also far N GA/SC. Below that is a major IP and ZR in much of NC/SC/N and C GA. KATL gets nearly 48 hours (1/27-8) of mainly ZR, probably some IP, and some S at the end. Neutral negative ENSO climo means enhanced probabilities for major ZR N GA late January as has been mentioned several times. KATL gets ~1" of mainly ZR (probably with some IP) and then a little snow at the end. Lows back into single digits following this big mess!

This could rival or even surpass the 1973 ice storm, thoughts??

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 Folks,

 Fwiw, per 6Z GFS per MeteoStar: major, very long lasting, and widespread winter storm for much of SE US (even down to Charleston as major ZR and a little wintry precip. Savannah) 1/26-early 1/29. Snow is mainly in NC but also far N GA/SC. Below that is a major IP and ZR in much of NC/SC/N and C GA. KATL gets nearly 48 hours (1/27-8) of mainly ZR, probably some IP, and some S at the end. Neutral negative ENSO climo means enhanced probabilities for major ZR N GA late January as has been mentioned several times. KATL gets ~1" of mainly ZR (probably with some IP) and then a little snow at the end. Lows back into single digits following this big mess!

 

This is the first 192+ hour truncated GFS fantasy solid snow storm modeled in North Carolina so far this winter.

 

Let's hope it comes to fruition!

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I like where the models are going with the configuration of the E Pac ridge by Day 10 and beyond.  GFS forms a strong omega block which will start up a split flow pattern with a parade of low pressure systems moving across with cold pressing overhead.  Perfect overrunning pattern.

 

No "big" single system.. no -NAO to slow down everything but it would be epic nonetheless with multiple systems moving through over days.

 

Agree, the d8 and d11 super ensemble GEFS is peppered with analogs for smaller events, this is getting crazy, if we don't get a 1-2" event in the next two weeks than we suck.

 

500hgt_comp_sup814.gif

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The CFS continues to cool off in it's depiction of February.  It seems to be getting a little colder in the east each run.  Precip still looks similar to previous runs, showing above normal the upper west sections of the SE and below normal for other the lower east sections.

 

All four weeks look solidly below normal temp-wise, with weeks 1 and 2 below normal precip-wise.

 

Below is the 324 hr panel of the 6z GFS, showing a split flow and a big SE winter storm.  Of course, it is always unwise to take these kinds of fantasy storms too seriously, but I'm posting it to suppliment the thoughts above and to illustrate what is possible with the upcoming pattern, should it verify (it's encouraging that the GFS, Euro, GFS Ens, and Euro Ens all agree on a cold and somewhat stormy period to close out the month and open January -- and as Packbacker said, if we can't score in this pattern, we suck).

 

 

post-987-0-05559700-1389798228_thumb.gif

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Man, the pattern looks awesome coming up. The PNA does relax on the ensemble mean after about hour 312. There's still a mean trough in the east with no SE ridge to be found.

This is a little concerning. Looking at the CPC site, it has the PNA very positive but does dive negative in the LR, the NAO goes and stays positve from it's current slight negative value, and the AO looks to go positive from it's current negative vaule. This look would scream warm up around day 16 or so(1st week of February. This upcoming two weeks may be our best chance for wintery precip this winter. It would be very nice to get one of these fantasy storms to verify.

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This is a little concerning. Looking at the CPC site, it has the PNA very positive but does dive negative in the LR, the NAO goes and stays positve from it's current slight negative value, and the AO looks to go positive from it's current negative vaule. This look would scream warm up around day 16 or so(1st week of February. This upcoming two weeks may be our best chance for wintery precip this winter. It would be very nice to get one of these fantasy storms to verify.

 

From Don Sutherland this morning:

 

4. The guidance points to the development of a PNA- toward the close of January. However, some recent forecasts toward that end didn't verify. The pattern evolution might be slower than what the guidance currently shows.

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This is a little concerning. Looking at the CPC site, it has the PNA very positive but does dive negative in the LR, the NAO goes and stays positve from it's current slight negative value, and the AO looks to go positive from it's current negative vaule. This look would scream warm up around day 16 or so(1st week of February. This upcoming two weeks may be our best chance for wintery precip this winter. It would be very nice to get one of these fantasy storms to verify.

 

Yeah I noticed that too.  The indices seem to all go very unfavorable starting in February.  Next two weeks looks like our best chance. 

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This is a little concerning. Looking at the CPC site, it has the PNA very positive but does dive negative in the LR, the NAO goes and stays positve from it's current slight negative value, and the AO looks to go positive from it's current negative vaule. This look would scream warm up around day 16 or so(1st week of February. This upcoming two weeks may be our best chance for wintery precip this winter. It would be very nice to get one of these fantasy storms to verify.

 

Good news is the AO has been modeled to go positive/strongly positive a few times lately, but that has been greatly tempered as we move closer -- greatly different from earlier in the season....same with the PNA.  The NAO is just going to not work this year, outside of some transient ridging/blocking.  I've given up on that.  And the warm-ups have generally been short-lived, so I wouldn't expect a sustained warm period.

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From Don Sutherland this morning:

 

4. The guidance points to the development of a PNA- toward the close of January. However, some recent forecasts toward that end didn't verify. The pattern evolution might be slower than what the guidance currently shows.

I sure hope so. The indice LR forecast and verification has not been great. Really this is where true meterology comes in.  

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Jan 2000 had blocking, so did Feb 2004 big event, so did Jan 2002 big event.  We can get snow with the +NAO but usually just small ones, 1-2".  It's going to be hard to get blocking with the PV sitting over Hudson Bay, that's been a staple of this winter and doesn't look like that is changing, so we are going to have to hope for 1" type events this winter.  Odds of a 6" event this winter is virtually nil.

 

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