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2015-16 Winter Pattern Discussion


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It's actually encouraging for me because the pattern we are in has been following some of the top analogs quite nicely. They indicated an average to above average November, a torch for December (especially Canada and northern US areas) and then a dramatic flip to cold by early January as blocking begins to amplify. Also I've seen some preliminary research on the PV which indicates a strong one for October-December has historically reversed itself by weakening quickly late December into early January. If true and if that does indeed happen it would further corroborate the forecast of cold January/February. With such a strong Nino and active STJ it could be a fun winter and well worth the wait imo.

 

Hmmm, now how do I feel about analogs, especially after last year? Let me think...oh here comes one now... :lightning:

Yeah I'm certainly in the wait and see mode right now.  I can see a lightswitch to a better pattern like the analogs portend, but I can also see us being slow to transition and missing the boat untill March.  I'm hoping of course for the former but preparing for the later. 

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Not too encouraging from one with all the data ...

 

 

Ryan Maue ‏@RyanMaue 4h4 hours ago

2nd week of December not too encouraging for winter reindeer games. old-GEFS temp anomaly:

 

CVKEFw5W4AALDxy.png

 

 

Doesn't that fit the pcbjr cold winter analog though?  i.e. Warm Oct through mid Dec, then flip?  Or are my dates off?

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Doesn't that fit the pcbjr cold winter analog though?  i.e. Warm Oct through mid Dec, then flip?  Or are my dates off?

 

 

You are spot on.

 

It's the lawyer in me - state your facts, reverse course to emphasize the facts even though they may seem improbable when looked at in a momentary context, state your facts again with a little more detail  - and make your point subtly and with humor; this post was the reverse course portion of my case just to emphasize  -- before more to come .....

 

Flip coming and buy a snow shovel with 2016 painted on it ...  :santa:

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Hmmm, now how do I feel about analogs, especially after last year? Let me think...oh here comes one now... :lightning:

Yeah I'm certainly in the wait and see mode right now.  I can see a lightswitch to a better pattern like the analogs portend, but I can also see us being slow to transition and missing the boat untill March.  I'm hoping of course for the former but preparing for the later.

Analogs have a bad rap because many times people use them incorrectly, that is they pick one similarity then find years to match that one variable. A good analog forecaster looks at many different things and uses the years with the closest similarities. This may include looking at the summer pattern, current fall setup, El Niño/La Nina state, STJ setup, blocking, etc and then finding the analog years that are the top results. While it's not 100% accurate since each year is unique I find the accuracy is quite good, usually 70-80% of the time you'll get the monthly pattern right. The good news is things are progressing quite nicely with the December torch, that's one of the most encouraging things for me to see right now. January and February should be fun!

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You know we're in bad shape when the AO and NAO must do an inordinate amount of work just to get back in the vicinity of 0.

 

We snow by mid-Jan 20...until then lots of squirming going on, especially by me  :bag:

 

Go this gif saved for mid-Jan if we still are looking at -PNA/+EPO/+AO/+NAO pattern.  Although when you really think about it, isn't it better to have all indexes wrong then having three things right and one wrong that messes it all up....

post-2311-0-89442500-1449070935_thumb.pn

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We snow by mid-Jan 20...until then lots of squirming going on, especially by me  :bag:

 

Go this gif saved for mid-Jan if we still are looking at -PNA/+EPO/+AO/+NAO pattern.  Although when you really think about it, isn't it better to have all indexes wrong then having three things right and one wrong that messes it all up....

 

I'd rather have most indexes in our favor....much easier to change one than all 4.  But I get what you're saying. :)

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You know we're in bad shape when the AO and NAO must do an inordinate amount of work just to get back in the vicinity of 0.

Sir, if we can get a split flow regime to set up we'll get rain every few days!  And if in Jan it gets into the 30's and 40's some, we'll see cold rain every few days.  What's not to like?  I do not understand your questionable attitude!  Please elucidate.  Most precipitiously yours, T

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Sir, if we can get a split flow regime to set up we'll get rain every few days!  And if in Jan it gets into the 30's and 40's some, we'll see cold rain every few days.  What's not to like?  I do not understand your questionable attitude!  Please elucidate.  Most precipitiously yours, T

 

Good word!  Even though it is an onomatopoeia, I still had to look it up. :)  We are far, far away from a good pattern, my friend.  Fortunately, we have a long road to go before it matters too much.

 

YES Positive PNA. Too bad the trough is in the plains and the NAO is shooting the Gulf and Atlantic into the SE. Might have to break out the shorts soon :)

Trimming the tree in the 80s is not helpful for getting into the holiday spirit! :(

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Pretty big run to run changes on the GEFS, new upgrade rolled out for 12z and some big changes came with it. Seems like a pattern change will occur Dec 18th ish, what that is remains to be seen but it looks like an active period for storms and storminess despite most likely being too warm for the frozen stuff. This possibly sets the stage for changes late Dec into Jan.

 

5 day (120hr) mean precip ending 12/18 (it's going to be wet, guys)

 

nom4fZn.png

 

Day 10: Monster ridge over NE, 540 line in hudson bay. 

 

liYUewV.png

 

Day 16: Broad trough most likely over US with ++ heights now NORTH of the hudson, 540 line in the lakes. Still a -PNA

 

7dm0o88.png

 

You can further see the ridge displacement on the comparison between 00z and 12z ensemble runs, both valid December 18th at 00z.

 

00z

Dt96OY1.png

 

12z

MlAi9nE.png

 

It's good to see in the LR and it may take time to start seeing a pattern that will produce the changes we need. Keep an eye out on where this ridge goes and what the teleconnections say for the end of Dec as it sets up the first half of Jan.

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Latest from Cohen on the AO.  As we already have surmised, it looks to stay positive through first half of December.  However, he's still looking for a possible change (albeit with caution) the 3rd week of December.  Maybe we are starting to see the LR models sniff out a pattern change.  Interesting that he keeps temps seasonal in the SE even during this "warm spell."  I suspect this is due in part to the strong subtropical jet and the increase clouds. 

 

http://www.aer.com/science-research/climate-weather/arctic-oscillation

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Good word!  Even though it is an onomatopoeia, I still had to look it up. :)  We are far, far away from a good pattern, my friend.  Fortunately, we have a long road to go before it matters too much.

 

Trimming the tree in the 80s is not helpful for getting into the holiday spirit! :(

 

We bought a flocked tree this year because we decided we needed to see some snow...

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Anyone who has access to the Euro care to comment on what it shows for Tuesday, December 8th? Don't have access to surface maps but it shows a strong vort trying to cut off near the NC border with cold 850s. Surface temps and precip I don't have access to, anyone?

A Nor'easter but looks too warm except maybe the high mountains in maybe VA and WV. and that is a Maybe.  

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Anyone who has access to the Euro care to comment on what it shows for Tuesday, December 8th? Don't have access to surface maps but it shows a strong vort trying to cut off near the NC border with cold 850s. Surface temps and precip I don't have access to, anyone?

Dealing with any frozen threat, the higher mountain elevations would be the most favored. The GFS was showing this possibility yesterday.  "Usually" this type of air mass would provide no hope for us off mountain folks. Just cold rain... 

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Anyone who has access to the Euro care to comment on what it shows for Tuesday, December 8th? Don't have access to surface maps but it shows a strong vort trying to cut off near the NC border with cold 850s. Surface temps and precip I don't have access to, anyone?

 

A Nor'easter but looks too warm except maybe the high mountains in maybe VA and WV. and that is a Maybe.  

It cuts off but the track is strange to me...only way it's cold enough is perfect timing during an early morning low and ULL energy. Verbatim it's flurries in the mountains if precip hangs back, flurries or a mix throughout NC as super best case scenario..this will change next run so who cares. haha

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Good word!  Even though it is an onomatopoeia, I still had to look it up. :)  We are far, far away from a good pattern, my friend.  Fortunately, we have a long road to go before it matters too much.

 

Trimming the tree in the 80s is not helpful for getting into the holiday spirit! :(

 We are getting the split flow which to me the most propitious of signals for winter precip.  If they keep up, in a month it will be winter, when it actually gets cold in Ga, and that spells multiple events one right after they other, and deep into Ga. then up the seaboard,  as you know a ridge will form out west eventually, and blocking will form northeast of here, eventually, as all things change, eventually, lol. It's a fine pattern, and a normal Ga Dec so far.  The mosquitoes are gone, my Xmas lights are going up.  It's cloudy, not over hot today...happy times!!  The pattern change is coming soon, no worries....and by the way I am not making animal noises when I type, lol, though to me, onomatopoeia looks like some kind of growth, or lump, just looking at the word...or perhaps a species of caterpillar, and I was ready to fight, until I looked it up :)

  I'll go out on a limb and say you could have another opportunity to predict an Xmas snow coming soon..so be of good cheer.  Seriously, a split flow starts the show!! Tony

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