The Weather Outlook

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Brian Gaze
17 September 2016 09:50:10

That reanalysis certainly confirms how UK winters have changed for those of us of a certain age. Do you have a source for that chart? Because I'd be interested in whether there might have been a trend in the opposite direction over the preceding 65 years. And also in whether the rate of change has altered during the current 65-year period. After all, at some point the rate of change has to slow down or stabilize, or even reverse. It can't keep going in that direction at a stable rate for ever.

Originally Posted by: some faraway beach 

It's off one of the NOAA servers but was tweeted to me last winter and I don't have a link. Good points you raise and which I don't have answers to. Nonetheless, it backs up the theory that winter patterns have changed in recent decades. 


Brian Gaze

Berkhamsted

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roger63
  • roger63
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17 September 2016 13:42:55

This is the most telling reanalysis chart I have seen:

Originally Posted by: Brian Gaze 

Indeed a very telling chart which demonstrates a deepening of low pressure over Iceland and  a rise over the Azores and thereforea strengthening circulation and more positive NAO.

In term of the NAO it is worth noting that the NAO time series  DJF 1826-2015 has roughly twice as many NAO +winters as NAO - ones,so the conditions for cold winters is not a 50.50 event- but 32:68 as we know to our cost!

Within the 1826-2015 series there are wide variations over different time periods.For the period 1950-2015 the NAO  - % is 42%>however this figure is skewed by the 1960's and 70,s where 11 out of 17  64% of winters were NAO -

The period 1870-1935 however had only 22% NAO - winters.

the 1950-2015 reanalysis shows a strengthening  circulation there is a current hypothesis  suggesting the jet is moving further south- would that lead to an even stronger zonal flow?

Steve Murr
17 September 2016 14:26:02
That shows 1950-2015

However 2000-2015 is almost the inverse....

Brian Gaze
17 September 2016 15:01:26

That shows 1950-2015

However 2000-2015 is almost the inverse....

Originally Posted by: Steve Murr 

Have you got a link to the NCEP server where that chart can be viewed or generated?


Brian Gaze

Berkhamsted

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roger63
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17 September 2016 15:38:30

That shows 1950-2015

However 2000-2015 is almost the inverse....

Originally Posted by: Steve Murr 

 2000-2015 is a short period and is probably  skewed by the  2009/10 winter which had a DJF NAO of -3.12

KevBrads1
17 September 2016 15:44:29

 

The 2000-2105 is a short period and is probably  skewed by the  2009/10 winter which had a DJF NAO of -3.12

Originally Posted by: roger63 

There were a number of -NAO summers in that period as well. Summers 2007-2012 were all -NAOs. NOAA have both last summer and this summer as -NAO


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Steve Murr
17 September 2016 19:05:22

Hi Brian

Ive done the image -
Cant upload it though from iphone -unsure on here though

i personally although 2009 does skew it

Steve Murr
17 September 2016 19:08:17
I can email it?
Rob K
19 September 2016 18:07:11
Brian in your Buzz article you say "the odds of a cold winter have got lower", surely you mean higher, i.e. less chance?
Yateley, NE Hampshire, 73m asl

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Essan
19 September 2016 18:15:15

Brian in your Buzz article you say "the odds of a cold winter have got lower", surely you mean higher, i.e. less chance?

Originally Posted by: Rob K 



Semantics.

They have gone from zero to zero


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Rob K
19 September 2016 18:26:52



Semantics.

They have gone from zero to zero

Originally Posted by: Essan 

 

It's amazing how negative fans of cold weather are these days considering we had the best winter in a couple of generations just six years ago. But people on TWO were still moaning even then.


Yateley, NE Hampshire, 73m asl

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Brian Gaze
20 September 2016 07:50:14

Brian in your Buzz article you say "the odds of a cold winter have got lower", surely you mean higher, i.e. less chance?

Originally Posted by: Rob K 

Yes that's what I mean. In any given year the chances are slightly lower than they were. 


Brian Gaze

Berkhamsted

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Andy J
20 September 2016 22:29:36

Some early thoughts from me regarding the coming Winter then.   

I wanted to see if there's a variation in October synoptic anomalies depending on whether the following Winter was mild or cold, but only during a similar stage in the solar cycle to this year.  So I established 5 Octobers that preceded Mild Winters, these are 2004, 1994, 1973, 1974 and 2006.   

And the 5 Octobers that preceded cold Winters are 2005, 1995, 1984, 1962 and 1963.   Remember all these 10 years were at a similar stage in the solar cycle to 2016.

Running a composite for each set of years gives a striking result.  The cold Winter block was preceded by Octobers that had a Low Pressure anomaly near Iceland, and High Pressure anomaly over mainland Europe, with generally milder and drier conditions for the UK.

But looking at the mild Winter block, the anomalies are completely reversed, with instead a High Pressure block to the N and NW of the UK, with Low Pressure anomalies dominating Europe, resulting in a wet October for the UK.

Interesting also, that in the cold Winter block, only one year had an El Nino ongoing, with 2 La Nina and 2 ENSO Neutral conditions.  Whereas the mild Winter block had 3 El Nino years, 2 La Nina, and 0 ENSO Neutral years.   I didn't see any effect from the QBO signal, so for me the QBO figure in October is a very poor predictor of the following Winter.

So, if you're looking for a cold Winter this time around, we need to see a decent amount of High Pressure to the S and SE of the UK, and with Low Pressure mainly staying to the W or NW of us.

 


Gainsborough, Lincolnshire.
tallyho_83
21 September 2016 00:21:32

So, if you're looking for a cold Winter this time around, we need to see a decent amount of High Pressure to the S and SE of the UK, and with Low Pressure mainly staying to the W or NW of us.

 

Originally Posted by: Andy J 

This is exactly what we have been seeing and will be experiencing more of from the middle of this week - LP to the W or NW and HP to the SE.


Home Location - Vixen Tor Close, Okehampton, Devon (221m ASL)


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Brendon Hills Bandit
21 September 2016 16:30:41
Think maybe we are all getting a bit hung up on the QBO, I know it does have at least some influence on our winters, but really not a huge amount of influence from what I've seen and read. If I have it right, 1968-69, 1978-79, 1984-85, 2010-11, all occured during the westerly phase of the QBO.

For me the worry is the persistently warm SSTs in the gulf of Alaska.


220m asl, edge of Brendon Hills
CreweCold
21 September 2016 23:44:48

Fergieweather (Ian) has posted on the other side quite an enlightening post as to where the thoughts of the Metoffice pros are at this point in time. Suggests there are tentative signs of an easterly sourced outbreak as early as November with some current convergence of seasonal modelling on a much different (blocked) winter to last year.


Crewe, Cheshire

55 metres above sea level

festivalking
22 September 2016 09:14:44

Fergieweather (Ian) has posted on the other side quite an enlightening post as to where the thoughts of the Metoffice pros are at this point in time. Suggests there are tentative signs of an easterly sourced outbreak as early as November with some current convergence of seasonal modelling on a much different (blocked) winter to last year.

Originally Posted by: CreweCold 

 

Have you a link for his thoughts?


Dousland, Dartmoor 206 m/asl

Its only going to snow when Gibby says so.

The Beast from the East
22 September 2016 10:11:15

The last few winters have been so awful down here (in terms of cold), anything is going to be an improvement.


Purley, Surrey, 70m ASL

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Twister
22 September 2016 12:11:31

Have you a link for his thoughts?

Originally Posted by: festivalking 

It's in their ENSO thread: https://www.netweather.tv/forum/topic/79367-enso-discussion/?page=31#comment-3452070


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Winter 2016/7: Snowfalls: 4 (Jan 12-3, Feb 10-11) | Snowcover: 2 (Jan 13, 2cm, Feb 11, 3-5mm) | Air frosts: 57 (2 in Oct, 10 in Nov, 13 in Dec, 19 in Jan, 6 in Feb, 3 in Mar, 4 in Apr)

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Rob K
22 September 2016 20:39:05

Fergieweather (Ian) has posted on the other side quite an enlightening post as to where the thoughts of the Metoffice pros are at this point in time. Suggests there are tentative signs of an easterly sourced outbreak as early as November with some current convergence of seasonal modelling on a much different (blocked) winter to last year.

Originally Posted by: CreweCold 

 

Just to clarify, he is talking about an easterly phase of the QBO (specifically 10hPa level) rather than easterly winds driving our weather.


Yateley, NE Hampshire, 73m asl

"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome

CreweCold
22 September 2016 23:23:05

 

 

Just to clarify, he is talking about an easterly phase of the QBO (specifically 10hPa level) rather than easterly winds driving our weather.

Originally Posted by: Rob K 

Yep gathered that's what he meant after a re-read, perhaps I should have made it a bit clearer :)

Still, I'm encouraged nonetheless. 


Crewe, Cheshire

55 metres above sea level

springsunshine
23 September 2016 06:56:20

My gut feeling is that we are in a run of mild/very mild winters,similar to the 1990`s early 2000`s and other than fleeting short lived outbreaks of cold the next several years will be highly zonal and would not be surprised to see winter 2016/17 similar to 2013/14 and any chance of cold will be during February/March.

Just gut feeling based on the very warm temperatures in the northern hemisphere at the moment,there is no signs of much of cool down,which by now we usually have started to see.

The winter will be what it will be and am sure there will be some suprises as there usually is in the uk.

Justin W
23 September 2016 07:06:00

My gut feeling is that we are in a run of mild/very mild winters,similar to the 1990`s early 2000`s and other than fleeting short lived outbreaks of cold the next several years will be highly zonal and would not be surprised to see winter 2016/17 similar to 2013/14 and any chance of cold will be during February/March.

Just gut feeling based on the very warm temperatures in the northern hemisphere at the moment,there is no signs of much of cool down,which by now we usually have started to see.

The winter will be what it will be and am sure there will be some suprises as there usually is in the uk.

Originally Posted by: springsunshine 

My instinct tells me something different. I think we are in for the coldest and driest winter for six or seven years.


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four
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23 September 2016 07:23:15

There will be surprises for many this winter, definitely not a wet and mild winter like last year.


Brian Gaze
23 September 2016 07:55:29

The starting parameters are looking more promising this year but I'm very cautious. Persistence shouldn't be overlooked and this year 8 out of 9 months so far have been warmer than average. Recent winters have also trended milder after the colder cluster circa 2009/10. At this stage I'd say we're starting from a position of having to roll a double 6 twice rather than three times. 


Brian Gaze

Berkhamsted

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