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tallyho_83
19 January 2021 14:34:29


 


 


Pfff....There’s too much involving winds sourced from the Sahara with that! 


Originally Posted by: JRobinson 


With the snow that southern Europe has had - yes i include Spain and southern Italy, Greece and of course north Africa including Sahara desert then maybe that's where we would want the wind direction coming from. 


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


UncleAlbert
19 January 2021 14:36:09

[quote=CField;1303846]


Talking of Feb 1978, there was a situation earlier during that January that produced a blizzard in Scotland.  It was synoptically not a million miles  away from that presented by this week's storm.  That particular storm moved slowly into the North Sea producing similar conditions on its northwest flank to those forecasted for late Wednesday into Thursday. Some may remember a story about a chap that was trapped by this storm in his car under a deep drift in the Highlands.  He survived suffocation because he was lucky enough to have tube in the car that he was able to push through the window and up through the snow.


fhttps://www.wetterzentrale.de/reanalysis.php?map=1&model=noaa&var=1&jaar=1978&maand=01&dag=28&uur=1200&h=0&tr=360&nmaps=24#mapref 

tallyho_83
19 January 2021 14:41:15


The latest ECM ensemble run for 10hPa suggests the chance of another wind reversal at the end of the month:



Originally Posted by: Gandalf The White 


Yes, however we are already in a -AO/NAO and a had a SSW as well minor SW as two reversal of zonal winds which have all failed to provide us and proper sustained cold and snow - how many reversal of zonal winds to we need? We already had HLB prior to this SSW anyway - i just feel since the SSW we have seen anything but cold and more wetter and the SSW has (if anything) ruined things as we already had blocking over Greenland. I was speaking to to Aidan McGivern on Twitter re the last SSW on 5th January asking him why since the SSW we are seeing milder weather and a reduction in HLB: - Here is what he had to say:









Aidan McGivern
 


@aidanweather



22h





Replying to
@SeanMoo88403784



Hi - there was a study last year that looked at past SSWs. In the past, when there was a Greenland high during onset of an SSW, there is often SW'ly winds a couple of weeks later. Very small sample size though, so caution needed, it just goes to show...
 
Every situation is different and you don't always get freezing easterlies. There has been a response in our weather from the SSW, it's just not been a 'beast from the east' style response. More of a southward-displaced jet stream.


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


Jiries
19 January 2021 14:52:53


CFS monthly anomaly charts going for a roughly average Feb but a rather cold March, with heights over Greenland dominant.


Meteociel - Modèle Numérique américain CFS (par mois)


 


The long range CFS model has plenty of eye candy from mid Feb onwards though. Only 654 hours out so probably just about nailed on I would say. 


 



Originally Posted by: Rob K 


I am sure Madrid will again goes round 2 snow storms while UK either sunny/cloudy cold and dry or cold rain.

Robertski
19 January 2021 15:02:45


 


Yes, however we are already in a -AO/NAO and a had a SSW as well minor SW as two reversal of zonal winds which have all failed to provide us and proper sustained cold and snow - how many reversal of zonal winds to we need? We already had HLB prior to this SSW anyway - i just feel since the SSW we have seen anything but cold and more wetter and the SSW has (if anything) ruined things as we already had blocking over Greenland. I was speaking to to Aidan McGivern on Twitter re the last SSW on 5th January asking him why since the SSW we are seeing milder weather and a reduction in HLB: - Here is what he had to say:









Aidan McGivern
 


@aidanweather



22h





Replying to
@SeanMoo88403784



Hi - there was a study last year that looked at past SSWs. In the past, when there was a Greenland high during onset of an SSW, there is often SW'ly winds a couple of weeks later. Very small sample size though, so caution needed, it just goes to show...
 
Every situation is different and you don't always get freezing easterlies. There has been a response in our weather from the SSW, it's just not been a 'beast from the east' style response. More of a southward-displaced jet stream.


Originally Posted by: tallyho_83 


 


My understanding is that we have not yet experienced any effects from SSW, this will show its hand around the end of the month.

Gandalf The White
19 January 2021 15:07:40


 


Yes, however we are already in a -AO/NAO and a had a SSW as well minor SW as two reversal of zonal winds which have all failed to provide us and proper sustained cold and snow - how many reversal of zonal winds to we need? We already had HLB prior to this SSW anyway - i just feel since the SSW we have seen anything but cold and more wetter and the SSW has (if anything) ruined things as we already had blocking over Greenland. I was speaking to to Aidan McGivern on Twitter re the last SSW on 5th January asking him why since the SSW we are seeing milder weather and a reduction in HLB: - Here is what he had to say:









Aidan McGivern
 


@aidanweather



22h





Replying to
@SeanMoo88403784



Hi - there was a study last year that looked at past SSWs. In the past, when there was a Greenland high during onset of an SSW, there is often SW'ly winds a couple of weeks later. Very small sample size though, so caution needed, it just goes to show...
 
Every situation is different and you don't always get freezing easterlies. There has been a response in our weather from the SSW, it's just not been a 'beast from the east' style response. More of a southward-displaced jet stream.


Originally Posted by: tallyho_83 

 


If you look at in the simplest term anything that disrupts the usual winter pattern over the Polar region can only have the potential to alter the synoptic patterns below.


Nothing guarantees a severe cold spell but as that tweet says, we have got the jet on a more southerly track and that has produced some wintry weather, particularly further north. That pattern is set to repeat itself again from Friday and through the weekend, with cold conditions spreading south and more chances for snow.


Don't forget that we are also at the point in the solar cycle (sunspots) when blocked periods in winter are more likely but, just like a SSW, that doesn't guarantee it will happen.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


tallyho_83
19 January 2021 15:16:39


 


If you look at in the simplest term anything that disrupts the usual winter pattern over the Polar region can only have the potential to alter the synoptic patterns below.


Nothing guarantees a severe cold spell but as that tweet says, we have got the jet on a more southerly track and that has produced some wintry weather, particularly further north. That pattern is set to repeat itself again from Friday and through the weekend, with cold conditions spreading south and more chances for snow.


Don't forget that we are also at the point in the solar cycle (sunspots) when blocked periods in winter are more likely but, just like a SSW, that doesn't guarantee it will happen.


Originally Posted by: Gandalf The White 


Yes quite - Similar to that experienced back in January 2019 although the jet took a more southerly track back then and we did get snow come the end of month into 1st Feb. - RobK of Hampshire can remember this well but for us it was rain that turned to heavy snow and was more of a 'slushfest at first with snow only settling on cars and rooftops with all the proper' accumulating snow over Dartmoor and outside of Exeter really. Just saw this tweet from MATT Hugo:


---------------









Matt Hugo
 


@MattHugo81



·7h

 





Just a gathering of plots of which continue to highlight significant interest for the second half of winter...another warming and weakening of the strat vortex seems likely the MJO is on the move, 5-6-7 likely phases - Long story short a +AO +NAO end to winter is NOT expected IMO


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


Rob K
19 January 2021 16:27:57

GFS still going with some snow on Saturday night for the south.



850s of around -5 to -6C but it does have the advantage of arriving overnight.


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
warrenb
19 January 2021 16:37:00

BBQ's at the ready at day 10 of the GFS (Caveat: Maybe with a brolly)


Ally Pally Snowman
19 January 2021 16:38:08


GFS still going with some snow on Saturday night for the south.



850s of around -5 to -6C but it does have the advantage of arriving overnight.


Originally Posted by: Rob K 


 


Looks like UKMO has the same feature. Do we dare to dream?


https://www.wetterzentrale.de/topkarten.php?map=1&model=ukm&var=1&run=12&time=96&lid=OP&h=0&mv=1&tr=24#mapref


 


Bishop's Stortford 85m ASL.
Snow Hoper
19 January 2021 16:40:55


GFS still going with some snow on Saturday night for the south.



850s of around -5 to -6C but it does have the advantage of arriving overnight.


Originally Posted by: Rob K 


Within low pressure the 850s are not as important I believe. However my local Meto talks of cloud and rain later on Sat.


Going to war over religion is like killing each other to see who has the better imaginary friend.


Home : Thorndon, Suffolk.
ballamar
19 January 2021 16:53:24
Always thought the parallel run is bang on 😂
jhall
19 January 2021 16:59:43

Always thought the parallel run is bang on 😂

Originally Posted by: ballamar 


Yes, it's a thing of beauty at T264 and T+288.


Cranleigh, Surrey
Snow Hoper
19 January 2021 16:59:51

Always thought the parallel run is bang on 😂

Originally Posted by: ballamar 

 


 


If only, was just about to give the models a miss for a few days then up pops a fanciful SH🤔.


Going to war over religion is like killing each other to see who has the better imaginary friend.


Home : Thorndon, Suffolk.
ballamar
19 January 2021 17:10:23

Always thought the parallel run is bang on 😂

Originally Posted by: ballamar 


add a channel low into the mix and I think we have resolved how the models will turn out

Rob K
19 January 2021 17:13:23

Who was it ordered a 1978-style SW blizzard? The GFSP was listening.


 



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
Snow Hoper
19 January 2021 17:15:32


 


add a channel low into the mix and I think we have resolved how the models will turn out


Originally Posted by: ballamar 


 


One or two?



Going to war over religion is like killing each other to see who has the better imaginary friend.


Home : Thorndon, Suffolk.
Downpour
19 January 2021 17:15:40


GFS still going with some snow on Saturday night for the south.



850s of around -5 to -6C but it does have the advantage of arriving overnight.


Originally Posted by: Rob K 


 


Probably cold rain unfortunately, uppers undercooked again!


Chingford
London E4
147ft
Rob K
19 January 2021 17:17:00


 


 


Probably cold rain unfortunately, uppers undercooked again!


Originally Posted by: Downpour 


I mentioned in the moaning thread that the iPhone app has been forecasting snow lots this winter, and so far none has arrived. It has been showing snow for Saturday and/or Sunday for a few days now, basically ever since it appeared in the 10-day range.


Met Office currently shows completely dry here all weekend, while BBC has light snow showers turning to sleet, for Sunday morning.


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
Downpour
19 January 2021 17:25:06


 


I mentioned in the moaning thread that the iPhone app has been forecasting snow lots this winter, and so far none has arrived. It has been showing snow for Saturday and/or Sunday for a few days now, basically ever since it appeared in the 10-day range.


Met Office currently shows completely dry here all weekend, while BBC has light snow showers turning to sleet, for Sunday morning.


Originally Posted by: Rob K 


 


We actually got lying snow (in Epping Forest) last weekend from a westerly. It was transient, but excellent for tobogganing while it lasted. We seem to be forecast a mixture of sleet and bone dry this weekend, so probably worth keeping an eye on it. 


Chingford
London E4
147ft
tallyho_83
19 January 2021 17:39:47


Who was it ordered a 1978-style SW blizzard? The GFSP was listening.


 



Originally Posted by: Rob K 


Nice - i saw this both 12z control and para are on to something post +252z but a long way out to take as Gospel. However, this is the Synoptic charts for Para @270:


 


Control @ 270z:



Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


tallyho_83
19 January 2021 17:48:38
Control is a cold outlier @ +t270z:

How come I can't find the para one in the ensembles diagram!? - I want to see if the para run is a cold outlier too?

https://www.wetterzentrale.de/en/show_diagrams.php?geoid=49069&model=gfs&var=2&run=12&lid=ENS&bw=1 


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


ballamar
19 January 2021 18:04:55
For the parallel subtle changes occur at 180 - not too far to see if that can be continued in subsequent runs
jhall
19 January 2021 18:10:48

Control is a cold outlier @ +t270z:

How come I can't find the para one in the ensembles diagram!? - I want to see if the para run is a cold outlier too?

https://www.wetterzentrale.de/en/show_diagrams.php?geoid=49069&model=gfs&var=2&run=12&lid=ENS&bw=1

Originally Posted by: tallyho_83 


Because the Para isn't an ensemble member, being rather a beta variant of the Op. I think if you want to look at it there's no alternative to looking at the individual charts.


Cranleigh, Surrey
Brian Gaze
19 January 2021 18:10:50


Ok.... can someone please tell me why I can never post links in any of the forums here?


 


I couldn’t post any links myself. It gets reported as spam.


even now when I quoted another persons post in my reply it got rejected as spam.


only when I removed the link from his post did it get accepted.


many thanks in advance from a forum noob


Originally Posted by: JRobinson 


Not sure if you've resolved this.


If not the only thing I can suggest is that I log in with your credentials to see if there is a problem with the account. 


PM me if you me to help further with this.


Brian Gaze
Berkhamsted
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