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Winter 2014-2015 Pattern Discussion Thread II


JoshM

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Model trends have been quite disappointing to me over the last few runs in terms of early Jan. cold potential due to the cold aiming for the SW US. Intense cold aiming that far west of the SE rarely does much good for at least GA/SC/NC. If anything, it is a bad thing on average as that tends to allow for ridging near the SE. Let's hope this awful trend reverses soon. Otherwise, Jan. is liable to not start off too well.

The latest GEFS AO forecast is looking downright ugly:

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao.sprd2.gif

Hopefully, the latest two CFSv2's don't come to pass or it would probably be a long, boring Jan and the polar opposite of what I've been expecting: (CFSv2 has shown some skill this close to the month being forecasted, unfortunately):

http://www.cpc.ncep.noaa.gov/products/people/mchen/CFSv2FCST/monthly/images/CFSv2.NaT2m.20141225.201501.gif

http://www.cpc.ncep.noaa.gov/products/people/mchen/CFSv2FCST/monthly/images/CFSv2.NaT2m.20141224.201501.gif

Edit: At KATL, Dec. has a good shot at ending up warmer than Nov.

Edit: The 12Z GFS is starting off in the crapper (through 96). Ugly!

 

Agreed, I think this will be a great wintery pattern for the OH-V into the interior NE the next 2 weeks.  We will be on the wrong side of the SLP track, but we will be wet and battling seasonal to cool.  I don't think we will be in the 60's or anything, which is unfortunate, as that would be a welcome reprieve from this really bad pattern.

post-2311-0-67356200-1419525054_thumb.pn

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PARA is really close to a big one. One thing I want to see by Sunday. Does the GFS continue to relax the SE ridge allowing colder air to spill in? Do those big highs get better placement? Where does the PV actually end up dropping? Lots of questions still need to be answered before we close the book entirely on next week. 

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Agreed, I think this will be a great wintery pattern for the OH-V into the interior NE the next 2 weeks. We will be on the wrong side of the SLP track, but we will be wet and battling seasonal to cool. I don't think we will be in the 60's or anything, which is unfortunate, as that would be a welcome reprieve from this really bad pattern.

This pattern could well for west tenn northern miss and Arkansas

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12z GfS was a huge improvement over yesterday's runs . Western ridge was a bit east and it never took a beating

Just got a chance to look at the 12z GFS, and I agree. I actually like the day 6 setup. In my opinion, this look could lead to something good.

**at this point I'm trying to only focus on day 7 and below.

 

http://mag.ncep.noaa.gov/Image.php?image=data%2Fgfs%2F12%2Fgfs_namer_144_850_temp_mslp_precip.gif&model=gfs&area=namer&storm=&cycle=12&param=850_temp_mslp_precip&fhr=144&group=Model+Guidance&imageSize=M&ps=model&use_mins=no&preselected_formatted_cycle_date=20141225+12+UTC&scrollx=0&scrolly=0

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Just got a chance to look at the 12z GFS, and I agree. I actually like the day 6 setup. In my opinion, this look could lead to something good.

**at this point I'm trying to only focus on day 7 and below.

 

http://mag.ncep.noaa.gov/Image.php?image=data%2Fgfs%2F12%2Fgfs_namer_144_850_temp_mslp_precip.gif&model=gfs&area=namer&storm=&cycle=12&param=850_temp_mslp_precip&fhr=144&group=Model+Guidance&imageSize=M&ps=model&use_mins=no&preselected_formatted_cycle_date=20141225+12+UTC&scrollx=0&scrolly=0

 

I agree...for everyone who is doom and gloom about this there are still a lot of things in the air. For instance once cold comes if it does the way the GFS has it.....in a lot of cases in the past it tends to stick around a little longer. Also with good placement of high models tend to undercut how cold it actually is. Just need a little movement and we can get something good....can also go really bad with a little movement. That's the chance you take living in the south though. 

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I finally got a chance to look at the GFS. It evolves pretty nicely, actually. The energy that cuts off in the SW is NOT a/the problem. If you look at H5 around 168 or so, you have a block over top of the cutoff and a clear split flow. The trajectories into the US are clearly out of the NW and the PV is in eastern Canada. The ridge out west remains pretty much in tact through the run and blocking develops in and around the NAO region.

There's no specific fantasy snow, but you wouldn't have to change very much to have a few legitimate shots at something. If the pattern evolves like the GFS is showing, it won't take long for people to get excited. Still a big IF though. Anyway, I'm very happy with that run!

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Big fail on the PV split, it battles the warming, but the warming fades and it re-stregthens. If this is correct it's going to be Feb before a split occurs, or I should say, if a split were to occur.

Unicorn. There's been a lot of talk about the models being waffling back and forth. I don't think that's really the case. Except for those insane runs two days ago, the models seem consistent with keeping the ridge a bit too far off the coast and dumping the cold in the southwest and central us. I think were toast till mid January at earliest. Punt. Don't hate...

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PARA is really close to a big one. One thing I want to see by Sunday. Does the GFS continue to relax the SE ridge allowing colder air to spill in? Do those big highs get better placement? Where does the PV actually end up dropping? Lots of questions still need to be answered before we close the book entirely on next week. 

The Day 7-10 pattern is not far from an Ice setup, we just need the timing of the hp's over the plains/stj cutoff ejection to be right. Time will tell.

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I agree...for everyone who is doom and gloom about this there are still a lot of things in the air. For instance once cold comes if it does the way the GFS has it.....in a lot of cases in the past it tends to stick around a little longer. Also with good placement of high models tend to undercut how cold it actually is. Just need a little movement and we can get something good....can also go really bad with a little movement. That's the chance you take living in the south though. 

 

With the last wedge for yesterdays "severe chances" in SC.  It basically waited until after the moisture was gone before it eroded.  Models didn't really pick up well on that until the night before (a few hrs before it was supposed to rise to 65-70 degrees).  

 

We've learned over the years that wedge scenarios end up colder and longer than forecast even.

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Hello....long time lurker. The key for us if a SSW event happens. If not, I'm clueless on how we can get a period of sustained cold without a -nao. Also qbo is too negative IMHO. Happy holidays!!

Hello! That's a softball. +PNA can easily lead to a cold east....very cold even. Don't count on a SSW. Don't count on a -NAO. You'll rarely see those in winter. Look for the PAC jet to slow and a PNA ridge. Plus, we can get a -AO to displace the PV south, but who knows when/if that actually happens.

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