2017-18 Winter Discussion thread

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Re: 2017-18 Winter Discussion thread

Post by algae888 on Sat Oct 14, 2017 6:53 pm

all major models continue to flip to a +pna and -nao to end October. whether it last or is transient remains to be seen however gefs has a strong signal.



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Re: 2017-18 Winter Discussion thread

Post by amugs on Sat Oct 14, 2017 7:34 pm

Pig eye AL LP finally going to retrograde west and allow the pan spike with a rwcurvibg typhoon.
Solar is muted now too after a fury for a good 4 weeks. No flares or coronal holes ejected it's solar stream towards us.
Okay anyone checking out we have had 3 volcanoes erupt and 3 eq in the last two weeks?? Agnung stillmpercolating along with Campo in Italia.

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Re: 2017-18 Winter Discussion thread

Post by Frank_Wx on Mon Oct 16, 2017 7:54 am

Jesus....La Nina really coming on strong last 7 days. Lots of cooling in the central and eastern ENSO regions.



This is probably the most classic La Nina look I've seen in awhile with regards to mean zonal winds.


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Re: 2017-18 Winter Discussion thread

Post by amugs on Mon Oct 16, 2017 8:53 am

East based Nina - good - just have to keep 3.4 and 4 warmer than 1.2 so we dont pump the SE ridge.
PDO is going N by that SST map

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Re: 2017-18 Winter Discussion thread

Post by amugs on Mon Oct 16, 2017 8:59 pm

KEEP BUILDING BABY North American SNOW COVER COLD AIR SOURCE - temps have hard time modifying if we build a glacier above us in CANADA


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Re: 2017-18 Winter Discussion thread

Post by jmanley32 on Mon Oct 16, 2017 9:23 pm

calling a blizzard watch a winter storm watch instead does not convey proper info imo. big changes.

https://www.weather.gov/crh/hazsimplification
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Re: 2017-18 Winter Discussion thread

Post by sroc4 on Wed Oct 18, 2017 6:42 am

With a recurving Typhoon over the next 5-7days a decent shot of cold is coming into the east.  It should only last about 5-7days overall beginning around the 24th-25th and lasting through about the 31st with a brief moderation in the middle of that time.






Beyond that we will have to see.  Some hints at a piece of the mean trough near the Aleutians will break off and dropping south towards the west coast which would bring us back to higher heights overall in the east (La Nina like base state).  As of now that is our main driver(neutral to La Nina like pattern, "base state"= when other pattern enhancers are not at play, but the MJO is strongly pulsing and forecasted to propagate strongly through phases 5-7 before possibly crashing back into the COD.  We will see how the MJO forecasts play out as well as the MJO wave is def something that will affect the big picture in likely a transient way if it goes back into the COD.  




You can see for yourself what the MJO temp composites look like for phases 5, 6, and 7.  You can also see they are a little different depending on if your looking at the avg composite for Sept/Oct/Nov vs  Oct/Nov/Dec



By the weekend, out ahead of the cold shot mentioned above into the east this will be the look, very Nina like, trough west ridge east.  


All Nina regions cont the trend towards weak La Nina, now even Nina region 4 is taking the nose dive.  The SOI index conts to blow with strong easterly's across the trop Pac.  Franks 850mb wind anomaly map he posted a day or so ago shows the results of the persistent SOI in the mod-strong positive nicely.  And as stated prev the overall temp changes in the trop Pac should cont to slowly trend colder with potential for transient temp increases, but over all trends towards cooler anomalies.   Exactly how long and how strong the cooler anomaly's will trend we shall see.  





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Re: 2017-18 Winter Discussion thread

Post by sroc4 on Wed Oct 18, 2017 7:33 am

I would like to make one additional comment on this image.  



I keep referring to the "base state".  Like I mentioned above without any other big picture pattern driver/enhancer the Tropical Pacific is one of the most influential pieces to the puzzle of how the N Hemisphere's overall pattern plays out, esp N America as it is the first landmass down stream.  This time of year climatology is such that the cold air masses are still not that cold relatively speaking.  Relative to say late Jan where when a piece of polar or arctic air breaks off and descends into the lower latitudes over N Amer, its over all effects/affects on the pattern would be different then the effects/affects this time of year.  What I mean by that is this.  If you look below at the global SST anomalies you will see that the weak La Nina to neutral trop Pac combined with the warm SST Anomalies in the western Atlantic support a mean trough in the west and Ridge in the east.  BUT if we took this exact SST configuration into late Jan the intensity of the eastern ridge will likely be muted by the much colder air in Canada, relative to now, because remember cold air is much more dense than warm air and would not be pushed back so easily.  So when the ridge goes back up in Jan, all things being equal, the higher heights would likely not extend quite as far N as we see them on this image.  

And so this is what I'm looking at for our upcoming winter.  The stronger the Nina, the stronger the "Base State" of trough west, ridge east configuration will be.  The stronger the base state the harder it will be for other pattern drivers/enhancers to overcome the base state with any real "staying power".  This does not mean that we cannot have periods of troughing in the east with colder anomalies and chances for snow of course.  We have a -QBO which statistically increases our odds at stratospheric warming events throughout our winter which will hopefully fight against the base state if favorably positioned warming events take place.  We have a Siberian snow growth that is normal to above normal which also statistically favors enhancments to strat warming events and a -AO which increases odds for cold air intrusions into the mid latitudes of NA. MJO waves will also be a wild card that may either fight the base state OR enhance the base state depending on the phase.  If we get phases 4-6 in the Dec through Feb time frame we will torch the entire winter as these phases will enhance the La nina Base state.  A fear I have is that even with a weak La Nina or technically even Neutral Trop Pac that the strength of the warm SST Anomalies in the western Atlantic right now will allow the SE ridge to flex unfavorably into the NE every time these other pattern enhancers are in flux or aren't as strong.  A scary proposition I know.  I dont even like discussing it but when looking at the big picture it has to be recognized.  


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WINTER 2012/2013 SNOW TOTALS 43.65"
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Dec 11th = coating
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Jan 5th-6th = 3"
Jan 7th = 10.4"

Jan 14th = 1.75"
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March 10th = 4.8"
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Re: 2017-18 Winter Discussion thread

Post by algae888 on Wed Oct 18, 2017 9:10 am

http://easternmassweather.blogspot.com/2017/10/autumn-chill-ensues-as-enso-begins-to.html
these guys are pretty good  forecasters. this is there latest outlook for this winter.
here is their composite for winter 2017-18...

they are only using weak nina's  for analogs as they feel that if the nina gets moderate it will be to late to affect our winter. I agree esp first half of winter. where can I sign for this!
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Re: 2017-18 Winter Discussion thread

Post by jmanley32 on Wed Oct 18, 2017 12:57 pm

Ahh that sweet word blocking ; )
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Re: 2017-18 Winter Discussion thread

Post by amugs on Wed Oct 18, 2017 4:23 pm

algae888 wrote:http://easternmassweather.blogspot.com/2017/10/autumn-chill-ensues-as-enso-begins-to.html
these guys are pretty good  forecasters. this is there latest outlook for this winter.
here is their composite for winter 2017-18...

they are only using weak nina's  for analogs as they feel that if the nina gets moderate it will be to late to affect our winter. I agree esp first half of winter. where can I sign for this!

He is very good with his predictions and I'll sign below you on this one !

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Re: 2017-18 Winter Discussion thread

Post by algae888 on Wed Oct 18, 2017 4:24 pm

looks like next weeks system is going to cut to our west as the WAR is stronger than previously modeled and what scott has been pointing out as a concern for this winter. still looks like some rain for next week then cold to follow if euro is right...




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Re: 2017-18 Winter Discussion thread

Post by algae888 on Wed Oct 18, 2017 4:31 pm

amugs wrote:
algae888 wrote:http://easternmassweather.blogspot.com/2017/10/autumn-chill-ensues-as-enso-begins-to.html
these guys are pretty good  forecasters. this is there latest outlook for this winter.
here is their composite for winter 2017-18...

they are only using weak nina's  for analogs as they feel that if the nina gets moderate it will be to late to affect our winter. I agree esp first half of winter. where can I sign for this!

He is very good with his predictions and I'll sign below you on this one !
yes mugs he is good and I feel we will need blocking this winter to offset the WAR. I like how blocking or ridges are starting to show up on guidance as we head towards November....

euro

ensembles

gfs has trended weaker and east with higher heights near Greenland. let's see which model is correct come October 28th.
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Re: 2017-18 Winter Discussion thread

Post by sroc4 on Thu Oct 19, 2017 7:14 am

algae888 wrote:http://easternmassweather.blogspot.com/2017/10/autumn-chill-ensues-as-enso-begins-to.html
these guys are pretty good  forecasters. this is there latest outlook for this winter.
here is their composite for winter 2017-18...

they are only using weak nina's  for analogs as they feel that if the nina gets moderate it will be to late to affect our winter. I agree esp first half of winter. where can I sign for this!

There is no doubt I would sign too, but man this seems to be a bit premature on some of the discussion.  For instance:  This week, region 3.4 has actually warmed from an anomaly of -.05 Celcius to -.03. This is crucial because time was already of the essence as it relates to the ultimate peak intensity of this burgeoning la nina as winter ensues.

Well lets look now:


Then there is this comment: the warmest JAS ONI reading of any moderate la nina was -.07C, a full .6C warmer than the 2017 reading of -.01. It is with this in mind that we are effectively withdrawing all moderate la nina analogs from consideration.

I know we look for coorolations with diff things and try and relate it to something else, but I'm not sure I see any true significance to the fact that the ONI is not at -0.7 by Sept.  I mean I get what they are saying as far as trying to say that if its not here by now it will take to long for the atmosphere to respond even if the numbers cont to drop, but my response to this statement is this:

1) For every emerging La Nina, weak Mod or strong, I averaged the change in the ONI value from the last time it was in neutral territory(+0.4 to -0.4) and the first month it came in in Nina territory(less than or equal to -0.5).  For example as they point out as of Sept 2017 the ONI is -0.1(neutral).  If Oct ONI comes in at -0.5(La Nina) then I took the change of 0.4 and averaged it with the change from every emerging La Nina year as it went from neutral to La Nina.  ON avg when an emerging La Nina is coming the ONI drops about 0.37 or (0.4 rounded) when going from official neutral to the start of official Nina.  That said if Oct's numbers follows that trend then it's ONI should be right at -0.5.  Now the largest change I found was a drop of 0.7,from -0.1 to -0.8 in one month in 98-99.  What I can tell you with high confidence, but not 100% certainty is that this year Oct's ONI will come in close to that given the changes that have occurred this month putting this years ONI close to the same value as 98-99 around -0.8.  http://origin.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ONI_v5.php

2) We have to remember that even though we had a brief stint in the spring where a weak El Nino may emerge, we are actually still coming off a weak La Nina winter.  The atmosphere has been primed since last winter and late summer and now fall to behave in a La Nina fashion.  We have had neg neutral to weak La Nina conditions overall throughout this time frame.  In addition almost all strong and very strong El Nino's were followed by at least a moderate La Nina reflexively. Look at the La Nina following 82-83 as a prime example of how it just barley reached mod La Nina in 83-84; then came back toward neutral, then followed up with barely mod La Nina again in 84-85 yet these guys removed these two years from their analogues simply because they were mod La Ninas even though the were weakly mod and both of those years were also -QBO too.  

Even if officially we don't reach a Mod La Nina by the strictest of definitions if other pattern drivers and or enhancers do not play their part I fear the winter will not look anything like what these guys are currently using as their analogue package at 500mb. Again this is not to say that we wont have our cold shots and snow chances, but at least for now I am still worried that the avg 500mb map of the mean troughs and ridges from Dec through March will have more ridging in the SE and the center of that mean trough will be further west. AS OF NOW 



This is why IMO it is foolish in early Oct to try and put out a winter forecast.

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Dec 11th = coating
Dec 17th = 4.2
Jan 5th-6th = 3"
Jan 7th = 10.4"

Jan 14th = 1.75"
Jan 31st = 2.5"
Feb 9th = 12"
March 10th = 4.8"
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Re: 2017-18 Winter Discussion thread

Post by algae888 on Thu Oct 19, 2017 7:50 am

Scott they put out their official winter forecast on November 12th however they do start in August with preliminary predictions for the upcoming Winters
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Re: 2017-18 Winter Discussion thread

Post by sroc4 on Thu Oct 19, 2017 9:04 am

Yeah I know Al. They said final thoughts pending additional info. But why have to back track or whatnot. There were several concrete statements.

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"Go hug a human, not a weather model"
WINTER 2012/2013 SNOW TOTALS 43.65"
WINTER 2013/2014 SNOW TOTALS 64.85"
WINTER 2014/2015 SNOW TOTALS 71.20"
WINTER 2015/2016 SNOW TOTALS  35.00"
WINTER 2016/2017 SNOW TOTALS 42.25"
Dec 11th = coating
Dec 17th = 4.2
Jan 5th-6th = 3"
Jan 7th = 10.4"

Jan 14th = 1.75"
Jan 31st = 2.5"
Feb 9th = 12"
March 10th = 4.8"
March 14th = 3.5"
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Re: 2017-18 Winter Discussion thread

Post by frank 638 on Thu Oct 19, 2017 5:33 pm

I am hoping they all wrong I was watching Lee Goldberg and Lonnie Quinn winter Outlook forecast they both were saying we will see a weak La Nina would freaking cold shots short-lived. Lee Goldberg thinks we will have above to slightly above normal snowfall he is thinking that we should see anywhere from 30 to 35 in. And Lonnie Quinn is thinking we will see a normal to slightly below normal with 25 to 30 in. I hope they are wrong and we won't have a snowy cold or winter because we desperately needed for us snow weenies and I don't want a weak La Nina would mean a colder and snowy forecast for us that's what I thought

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Re: 2017-18 Winter Discussion thread

Post by frank 638 on Thu Oct 19, 2017 5:37 pm

My corrections I am sorry what I meant was Lee Goldberg has us for above to slightly above normal for snowfall that's anywhere from 30 to 35 in. And Lonnie Quinn thinks that we will see normal to slightly below normal for snowfall he is thinking anywhere from 25 to 30 in. I hope they are wrong we definitely need a colder and snowy winter to make us snow weenies happy

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Re: 2017-18 Winter Discussion thread

Post by nutleyblizzard on Thu Oct 19, 2017 7:19 pm

frank 638 wrote:My corrections I am sorry what I meant was Lee Goldberg has us for above to slightly above normal for snowfall that's anywhere from 30 to 35 in. And Lonnie Quinn thinks that we will see normal to slightly below normal for snowfall he is thinking anywhere from 25 to 30 in. I hope they are wrong we definitely need a colder and snowy winter to make us snow weenies happy
When a weak Nina or Nino is in place, there are other weather drivers that can dictate any given winter. Look back at the winter of 96 for example. We had a weak La Nina in place along with a +PDO and -NAO. We ended up with 78 inches that year. There are other examples where the pattern did not work out in our favor, and we ended up with below average snowfall. With a -QBO and low solar minimum on tap this winter, we should be in good shape as far as blocking is concerned. We'll see what Frank has to say in the coming weeks.
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Re: 2017-18 Winter Discussion thread

Post by frank 638 on Thu Oct 19, 2017 7:28 pm

Nutley you are absolutely right I cannot wait for Frank and everyone else's post for this upcoming winter hopefully it's a good one and a snowy one

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Re: 2017-18 Winter Discussion thread

Post by amugs on Thu Oct 19, 2017 8:57 pm

Low Solar is our blocking friend - been no flares or CME ejecting toward space ship earth for over 8 days now so blocking will show up in earnest!

2017 total: 66 days (23%)

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Re: 2017-18 Winter Discussion thread

Post by amugs on Thu Oct 19, 2017 9:11 pm

From JB - Interesting point here. IF this warm tongue keeps migrating NE then we could see the PDO go neutral to positive



There is a cooler tongue in the central Pacific and we have a more eastward centered cold enso event with the cold pool to the west of Australia. That cold pool keeps the winter MJO out of 4,5,6, the kiss of death by limiting convection. So these are some arguments cold. However overall a weaker version of the very warm stretch of SST from east of the Philippines into the Atlantic

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Re: 2017-18 Winter Discussion thread

Post by amugs on Thu Oct 19, 2017 9:23 pm

Here is an interesting graph from a met on another board computation of La Nina and NAO mean average and Snowfall amounts


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Re: 2017-18 Winter Discussion thread

Post by docstox12 on Fri Oct 20, 2017 5:21 am

amugs wrote:Here is an interesting graph from a met on another board computation of La Nina and NAO mean average and Snowfall amounts


Mugsy, the only thing I get out of that is the two extremes, '95-96 and '88-'89.Everything else is all over the place.Of course, that's in my opinion FWIW.

Seeing winter forecasts of warmer than normal with normal or a little above average snowfall.Don't mind it milder as long as there is normal or above normal snow.It would probably favor me up here in the HV with the elevation.As Doc says, "you gotta smell the rian to get the heavy snow". Can't even think of winter with this ridiculous October warm spell going on.
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Re: 2017-18 Winter Discussion thread

Post by Math23x7 on Sun Oct 22, 2017 10:53 pm

Honestly, given the cooler waters over the Pacific, including off of southern Alaska and off the west coast, I don’t think we will get the assistance of the red blob like we did in 2013-14 and 2014-15.  I think the only way we can get the cold/snowy winter we want is with the super negative AO/NAO with a bit of ridging out west.  The 1995-96 winter and the first half of the 2010-11 winter saw just that.  Without it, it will be a struggle to get the snow here.


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