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idj20
Friday, April 22, 2016 7:43:03 AM

Just had that "nothing to see" feeling when I cast my eyes over the various models - unless you're Quantum.   


Folkestone Harbour. 
GIBBY
Friday, April 22, 2016 7:43:50 AM
HERE IS MY LATEST ANALYSIS USING DATA SUPPLIED BY THE NWP OUTPUT COVERING 5 OF THE WORLDS MOST POWERFUL WEATHER COMPUTERS ISSUED AT 09:00 ON FRIDAY APR 22ND 2016

 


THE CURRENT GENERAL SITUATION High pressure is receding away to the West of the UK over the next day or so with an occluded front close to Southern Britain moving away South too tomorrow leaving the UK in a protracted cool Northerly airflow across the UK for some considerable time thereafter.


http://www.wetterzentrale.de/pics/Rtavn001.gif


CURRENT SNOW FORECAST AND FREEZING LEVEL OVER THE UK Colder uppers are spreading down from the North across the UK over the next few days with the freezing level falling to as low as 2000-3000ft across all parts of the UK by the end of the weekend. Any showers will fall as snow above 1000ft at times especially across the North and East.


http://www.snow-forecast.com/maps/dynamic/uk


http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif 


MODELS-2 WEEK HEADLINE Becoming colder at the weekend with cool nights and sunshine and showers looking likely with a continuing night frost risk thereafter. Perhaps becoming less cold as we enter May.


THE GFS JET STREAM FORECAST The Jet Stream is in the process of change as the flow becomes directed South across the UK over the next few days. It then remains in situ for the next week under the influence of Low pressure to the East of the UK. Then through the second week the theme is for the flow to back to a West to East flow and later a cyclonic flow as Low pressure transfers to the west of the UK.


http://www.netweather.tv/index.cgi?action=jetstream 


GFS OPERATIONAL The GFS Operational Run today shows a sustained cold and showery Northerly flow developing through the coming days and lasting for much if not all of next week. Then the pattern slowly changes passing through a transitional change of shallow and still showery Low pressure close to the UK before ending up with a deep Low developing just to the NW of the UK with wet and windy but less chilly conditions finally arriving towards the end of the second week.


GFS CONTROL RUN The theme of the Control Run is very similar to the Operational in relation to the colder phase of the run with next week and next weekend maintaining a cool and showery feel. However, the run couldn't be different in it's latter stages as on this run High pressure replaces Low pressure crossing the UK and ending to the North with a warmer and continental feed of winds across the UK with a lot of dry and fine condition to end the period.


http://www.wetterzentrale.de/pics/Rtavn1441.gif 


http://www.wetterzentrale.de/pics/Rtavn3841.gif


http://www.meteociel.fr/modeles/gefs_cartes.php?code=0&ech=144&mode=0&carte=0


http://www.meteociel.fr/modeles/gefs_cartes.php?code=0&ech=384&mode=0&carte=0 


GFS ENSEMBLE DAY 14 DATA Still very mixed messages from the Clusters today  which show a bias of 60/40 in favour of High pressure ruling the roost over the UK in 2 weeks time. There is still a sizeable group though who still prefer a much more cyclonic pattern with rain at times across the UK at the same time point.


http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=gefs&MODELLTYP=2&BASE=-&VAR=cpre&HH=372&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD= 


UKMO The UKMO model this morning still shows a cold and showery pattern developing across the UK in the coming days as Low pressure to the east and later NE dominates. Winds will be blowing from between North and NW strongest in the NE where the most frequent showers wintry on hills are expected with the risk of frost at night under any clear skies.


http://www.wetterzentrale.de/pics/Rukm1441.gif 


THE FAX CHARTS The Fax Charts today show a Northerly flow becoming established across the UK and far from straightforward as troughs are shown to be pulled South in the flow with cloudier skies and some rain being replaced by the coldest phase of the spell early next week under a more direct cold and showery Northerly by then.


http://www.weathercharts.org/ukmomslp.htm#t120 


GEM GEM this morning shows a sustained and cold run this morning with Low pressure to the Northeast or East and then over us for a time later maintaining cool and showery weather under Northerly sourced air throughout the 10 day period with a continued risk of frost at night for many and some snow over the hills at times for some.


http://www.wetterzentrale.de/pics/Rgem2401.gif 


NAVGEM NAVGEM N/A at time of issue. 


http://www.wetterzentrale.de/pics/Rnvg1681.gif 


ECM ECM also shows the cold Northerly intensifying early next week with showers and very cold winds blowing down from the North before the pattern eases later as pressure rises to the South leading to lighter Westerly winds warming things up later and killing off the showers from all but the far North and hopefully limiting the risk of frost much more by the end of the period as rain moves across the North and West under more traditional SW winds.


http://www.wetterzentrale.de/pics/Recm2401.gif 


ECM 10 DAY MEAN (12z) The 240hr mean Chart from last night is continuing the theme of the UK gradually lifting out of the cold spell as Low pressure gradually establishes closer to the NW of the UK with winds gradually settling West or SW with rain at times and higher temperatures together with some rain at times especially across the North and West.


http://www.wetterzentrale.de/pics/Reem2401.gif 


NOTABLE TRENDS & CHANGES FROM PREVIOUS RUNS Changes in the models remains slow but there is a continuing if by some models a tantalising shift away from the coldest conditions lasting too long this morning as the theme of milder Westerly winds arriving towards the latter part of the period continues to be shown.


31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKMO & ECM The verification Statistics of GFS, UKMO and ECM show at 24 hours ECM ahead at 99.6 pts with UKMO at 99.4 pts and GFS at 99.3 pts.  At 3 days ECM is leading with 97.2 pts to UKMO's 96.5 pts while GFS lags behind at 95.4 pts. At 5 days ECM leads with 88.4 pts to UKMO at 86.2 pts and GFS at 83.0 pts. Then at 8 Days ECM has the leading spot from GFS with 61.9 pts to 56.0 pts. Finally at Day 10 ECM has the lead from GFS with a score of 43.2 pts to 35.9 pts.


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day1_PMSL_MSL_G2NHX.png


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day3_PMSL_MSL_G2NHX.png


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day5_PMSL_MSL_G2NHX.png


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day8_PMSL_MSL_G2NHX.png


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day10_PMSL_MSL_G2NHX.png


MY THOUGHTS  Today's output shows more of the same in terms of the UK moving into a cold spell of Northerly winds and how we eventually find our way out of the rut late next week or beyond. What we have today is an occluded front across the far South and SW of the Uk today making for it's own injection of cool and rather gloomy weather with some rain while the rest of the UK have another bright and dry day. The rain in the South is then chased away by tomorrow as cold Northerly winds begin to embrace the UK between Low pressure to the East and High to the West. The gradient between these systems then steepens next week with a stronger and unusually chilly spell for late April with a mix of sunshine and showers, falling as snow on hills and where showers don't occur frosts at night are likely widely. It's not until late next week when the cracks begin to appear in this set-up as winds look like backing towards the West or even SW with milder conditions albeit with rain at times developing. However, models like GEM this morning enhance the length of the cold spell throughout the 10 days and it is just one of many options on the table beyond next week. What can be said with some certainty there is no heatwave on the cards any-time soon although with bright sunshine between the showers and the additional hours of daylight we have now it' certainly not all doom and gloom and it maybe that it's just patience that is required before the current synoptic pattern realigns to offer us something rather warmer. Time of course will tell. No report tomorrow or Sunday. Will hopefully be back next Monday with some better news for warm seekers.  


Next Update Monday April 25th 2016 from 09:00


Martin G
Kilmersdon Radstock Bath Somerset



Look up my New Facebook Weather Page  for all the latest up to the minute weather stories as they happen
Chunky Pea
Friday, April 22, 2016 9:36:50 AM


 


I am expecting nothing more than the odd shower, which may be convective. 


Originally Posted by: Essan 


As opposed to non-convective showers?


Current Conditions
https://t.ly/MEYqg 


"You don't have to know anything to have an opinion"
--Roger P, 12/Oct/2022
doctormog
Friday, April 22, 2016 3:53:19 PM
Looking at that link it seems that the zonal winds have remained reversed following the SSW? Does anyone have any factual data to back up whether that is usual? (As I would have thought that they would have resumed, albeit to a possibly lesser extent, within a week or two of the SSW event).

Anyway that aside it still looks cool on the model output with sunshine and showers in the coming days, some of those showers could well be wintry, especially in the first few days of the new working week.
Polar Low
Friday, April 22, 2016 4:10:50 PM

Going to feel bitter in the strong northerly wind that's for sure


Modele GFS - Carte prévisions


 


 


 

Polar Low
Friday, April 22, 2016 4:32:48 PM

Yes I can confirm it looks all very normal for April in any sunshine of course


Modele GFS - Carte prévisions

Quantum
Friday, April 22, 2016 4:34:20 PM

UKMO for monday midday. I've added the fronts and approximate location of the 850hpa -5C isotherm.


ukmonon


To me it looks like a back edge snow event, with snow showers moving into NW scotland on monday. The occluded front curling back round offeres the possibility of wintry weather to NE scotland also.


 


2024/2025 Snow days (approx 850hpa temp):
18/11 (-6)

2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
idj20
Friday, April 22, 2016 5:25:05 PM

Looks like low pressure will be sticking close by over the next week or so keeping it cool and showery with late night frosts, but some sunny breaks can be expected - and looking further ahead still, it seems that confidence of a dry and settled May Day Bank Holiday not looking that particularly high as things stand. However, the one crumb of comfort we could derive out of this is how the rest of Europe, particularly the Low Countries, looks like being in the same boat as us. Usually we find ourselves gnashing our teeth in envy and trying our hardest not to fettle about with the thermostat while the likes of Germany and Holland are basking in summer-like warmth - but it doesn't seem to be the case this time round. 


Folkestone Harbour. 
Whether Idle
Friday, April 22, 2016 7:04:07 PM


Note the gradual warming trend and the big FI outlier.


Dover, 5m asl. Half a mile from the south coast.
doctormog
Friday, April 22, 2016 7:38:31 PM
http://wxmaps.org/pix/temp4.html 

(I'm guessing I no longer need to add the "feeling pleasant in any April sun in the shelter in the south" caveat to each post)
Polar Low
Friday, April 22, 2016 7:47:36 PM

On a southerly facing beach  M


With a 1000 feet cliff behind you


 


 


http://wxmaps.org/pix/temp4.html 

(I'm guessing I no longer need to add the "feeling pleasant in any April sun in the shelter in the south" caveat to each post)

mildmildwest
Friday, April 22, 2016 10:22:07 PM

I could be seeing only my second snowfall of the 'season' if this materialises 


 


http://www.theweatheroutlook.com/twodata/chart.aspx?chart=/charts/gfs/18_153_mslp850.png?cb=655


 


 

Quantum
Saturday, April 23, 2016 12:48:13 AM

Wow if this comes off.


Netweather GFS Image


Its like the 1981 low that developed in situ. If that happens it would probably be the latest ice day ever recorded with heavy snow falling in scotland.


Modele GFS - Carte prévisions


2024/2025 Snow days (approx 850hpa temp):
18/11 (-6)

2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Gusty
Saturday, April 23, 2016 5:44:58 AM

The cold and showery theme continues for the best part of a week with only a slow recovery of 850Hpa temperatures to average by the start of May.


I remain confident that this meridonal pattern will produce some welcome noteworthy warmth as we move into early May.


In the mid term I see the April 1981 esq low pressure developing in the cold unstable flow is still being modelled for Thursday and Friday. Northern Britain need to keep an eye on this little fella.


Modele GFS - Carte prévisions


Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



Andy Woodcock
Saturday, April 23, 2016 7:43:28 AM

No sign of a warm up on either GFS or ECM with a cool, showery Bank Holiday under a slack northerly flow after the Arctic blast mid week.


GFS is cool and unsettled right out into FI again so the drier warmer start to May is looking dodgy this morning.


It's another sunny morning here to end what has been an exceptionally sunny week, Spring has been OK in Cumbria but the continuously cold nights has stunted plant growth somewhat and we have had far more frosts in March and April than December and January!


Andy


Andy Woodcock
Penrith
Cumbria

Altitude 535 feet

"Why are the British so worried about climate change? Any change to their climate can only be an improvement" John Daley 2001
Charmhills
Saturday, April 23, 2016 10:20:11 AM

Very convective looking outlook for this coming week ahead and chilly to despite the strength of the sun.


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.
exweatherex
Saturday, April 23, 2016 11:00:25 AM

I think you are going to miss a big chance for some serious snow because of the season... But again, it's better than nothing.


Here (in Greece), Africa hasn't stopped attacking. February scored a +5 above average temperature, becoming the hottest February of all time (since 1892 when observations started). March was a bit milder and scored "only" +1.5 above average. And then Africa returned in April, with the most extreme temperature being recorded on last Tuesday. There was +20 at 850 which is about +14 degrees above average, and 30 - 34 degrees at sea level. Locations near the sea were cooler thanks to the low sea temperature.


You see, some people are being grilled so you can have some snow

idj20
Saturday, April 23, 2016 11:19:51 AM


I think you are going to miss a big chance for some serious snow because of the season... But again, it's better than nothing.


Here (in Greece), Africa hasn't stopped attacking. February scored a +5 above average temperature, becoming the hottest February of all time (since 1892 when observations started). March was a bit milder and scored "only" +1.5 above average. And then Africa returned in April, with the most extreme temperature being recorded on last Tuesday. There was +20 at 850 which is about +14 degrees above average, and 30 - 34 degrees at sea level. Locations near the sea were cooler thanks to the low sea temperature.


You see, some people are being grilled so you can have some snow


Originally Posted by: exweatherex 



And yet most often then not in the winter season, the UK holds onto the mild and changeable stuff while Greece goes into the freezer.


Folkestone Harbour. 
Sevendust
Saturday, April 23, 2016 11:33:28 AM


And yet most often then not in the winter season, the UK holds onto the mild and changeable stuff while Greece goes into the freezer.


Originally Posted by: idj20 


It comes back to what I said yesterday. It's interesting that we are cold whilst there is a general record warming going on. All about synoptics obviously and it has still been relatively mild this year down here regardless of this week

briggsy6
Saturday, April 23, 2016 2:16:20 PM

On a slightly different tack, does anyone else think it would be a good idea if MetO forecasts gave a percentage chance of catching an April shower in any one location? I'm sure they used to do this but seem to have stopped for some reason.


Location: Uxbridge
Quantum
Saturday, April 23, 2016 2:38:45 PM

Tantilizing close to that 510 thickness line on Wednesday night.



The inner ring is 512dm


2024/2025 Snow days (approx 850hpa temp):
18/11 (-6)

2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
The Beast from the East
Saturday, April 23, 2016 4:28:07 PM

http://modeles.meteociel.fr/modeles/gfs/runs/2016042312/gfs-2-138.png?12


Thursday night still looking interesting


"We have some alternative facts for you"
Kelly-Ann Conway - special adviser to the President
The Beast from the East
Saturday, April 23, 2016 4:30:06 PM

http://www.meteociel.fr/ukmo/runs/2016042312/UW120-21.GIF?23-18


UKMO


"We have some alternative facts for you"
Kelly-Ann Conway - special adviser to the President
KevBrads1
Saturday, April 23, 2016 4:48:55 PM

Incredible chart, how often do you see a developing low with very cold air wrapping around it and at the end of April


 


Modele GFS - Carte prévisions


MANCHESTER SUMMER INDEX for 2021: 238
Timelapses, old weather forecasts and natural phenomena videos can be seen on this site
http://www.youtube.com/channel/UCgrSD1BwFz2feWDTydhpEhQ/playlists
Quantum
Saturday, April 23, 2016 7:24:21 PM


Incredible chart, how often do you see a developing low with very cold air wrapping around it and at the end of April


 


 


Originally Posted by: KevBrads1 


Drawn the fronts on for the GFS.


thursdayy


Really quite an active system with well defined fronts. 


2024/2025 Snow days (approx 850hpa temp):
18/11 (-6)

2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.

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