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SEMerc
29 December 2014 09:50:46

http://www.nsf.gov/news/special_reports/autumnwinter/predicts.jsp
Cohens forecast for this winter is out.

Originally Posted by: Solar Cycles 


Tick tock. Tick tock.

Gooner
29 December 2014 09:53:26


 


Tick tock. Tick tock.


Originally Posted by: SEMerc 


I think he has since changed it


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


SEMerc
29 December 2014 10:00:50


 


I think he has since changed it


Originally Posted by: Gooner 


As did I. I predict that Winter 2013/14 will be mild and wet with substantial flooding on the Somerset Levels and in the Thames Valley.

nsrobins
29 December 2014 16:04:15


 


As did I. I predict that Winter 2013/14 will be mild and wet with substantial flooding on the Somerset Levels and in the Thames Valley.


Originally Posted by: SEMerc 



I predict January and February will be severely cold and snowy everywhere.
I will change it in due course to fit the conditions, which may be the total opposite of the above.


See, this LRF game is a doddle


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
Brian Gaze
02 March 2015 22:34:40

Verdict?


Brian Gaze
Berkhamsted
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Gavin P
02 March 2015 22:47:13


Verdict?


Originally Posted by: Brian Gaze 


At least it gave us something to talk about in the "build up"


Rural West Northants 120m asl
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Saint Snow
02 March 2015 22:50:25


Verdict?


Originally Posted by: Brian Gaze 


 


Bin it.




Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
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lanky
02 March 2015 23:03:54

Very good result for E and NE USA but didn't work out for NW Europe at all well


Martin
Richmond, Surrey
Retron
03 March 2015 04:52:57


Verdict?


Originally Posted by: Brian Gaze 


Little correlation with what happened, unfortunately:


http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao_index_ensm.shtml


One swallow doesn't a summer make, but the first real test of the OPI hasn't shown it in a good light...


Leysdown, north Kent
Russwirral
03 March 2015 09:42:20
hmm....

It certainly hasnt been a mild winter, lots of snow for some places, and I would argue a large portion of the UK has seen snow falling, with another large amount seeing it settle.

This to me in my eyes despite being fairly benign for MBY, has been a more wintry than average winter (but only slightly) I think the OPI has probably delivered a signal.. but not a concrete answer. I think people are unfairly expecting snow on the ground for weeks on end.. that kind of scenario is a 1 in 20 yr event probably. This isnt reflective of the typical UK Winter.

The winter of 2014/15 should be considered a classic - similar to how the summer of 2014 was seen.

I think the OPI should be considered as a good indicator in the winter forecasts in future.
Brian Gaze
03 March 2015 09:49:16


 


Little correlation with what happened, unfortunately:


http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao_index_ensm.shtml


One swallow doesn't a summer make, but the first real test of the OPI hasn't shown it in a good light...


Originally Posted by: Retron 


 Very good summary IMO. 


Brian Gaze
Berkhamsted
TWO Buzz - get the latest news and views 
"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan
Stormchaser
03 March 2015 10:05:53

GFS Ensemble Arctic Oscillation Outlooks


A different angle this, but how often does the AO climb all the way up to +6 as shown for a week's time...? Seems pretty extreme 


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Global Warming
08 March 2015 09:31:29

The mean AO index figure for winter 2014/15 was +0.85. This is one of the highest figures in the historic series going back to 1950. So the OPI was a very poor predictor of the AO index this year.


Highest DJF AO index mean figures


1988/89  2.69 
1992/93  1.77
1989/90  1.25
1999/00  1.13
1991/92  1.09
1972/73  1.09
2006/07  1.00
1975/76  0.99
2007/08  0.86
2014/15  0.85


So winter 2014/15 saw the 10th highest AO index in the last 65 years

Global Warming
08 March 2015 09:39:41


A different angle this, but how often does the AO climb all the way up to +6 as shown for a week's time...? Seems pretty extreme 


Originally Posted by: Stormchaser 


The AO index exceeded +5 yesterday (7 March). http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao_index.html


Prior to yesterday the AO index had only exceeded +5 on 14 days since 1950. So this is indeed very unusual. The AO index has never reached 6 so it will be interesting to see what happens over the next few days. All previous instances of a >+5 index have been in Dec, Jan or Feb.


Highest daily AO figures on record


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