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Posts posted by Ben Sainsbury
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Yes the snow flakes are so huge, literally feathers like someone said.
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Now just starting snowing in Reading with big flakes!
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Currently in Reading and waiting for this wave of showers to pass over, temps/dewpoints seem a degree or two too high unfortunately.
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Not sure if anyone's posted these, but EURO4 looked quite impressive for coverage of snow showers through Tuesday and the Met Office fax charts show this well.
The following are for midday tuesday and tuesday night/wed, both show various troughs moving across the country showing increased precipitation and few small accumulations likely from these in places. Favoured areas look to be western areas.
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I'm not quite sure if EURO4 gives tomorrow's possible snow event justice. It looks underwhelming for most and feel like we should see more snow on the back-edge of the front. Thickness look in and around the 528 dam mark. Dew-points marginal at around 0 or 1'c. 850hpa temperatures look between -5 and -6'c; -7'c across parts of East Midlands. 2m Temps look around 2'c I just cannot see how these parameters represent no snow potential along the back-edge of the front, I mean EURO4 shows no snow potential whatsoever for North England southwards.
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ICON 6z is coming out at the moment and so far trough dropping more of a SSE direction compared to a ESE direction.
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As many have said already it is a knife-edge scenario! The low coming out of the US is EXTREMELY hard to model, and the likeliness of any models nailing its track and intensity down at this time is still unlikely. Until we know how it acts in the next 48 hours is crucial to what we see. If the low takes an unexpected track we could still see large changes at such a small range.
I hardly see people comment about the GFS P when it does verify better than the standard GFS. Don’t forget GFS P also follows the ICON & ECM solution.
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GFS P 12z by T222 showing a SIGNIFICANT snow event for the majority North England southwards as we see the low undercut.
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GFS P 12z, following a similar route to its 6z run just a slightly slower evolution, very good nevertheless!
By T138, the Azores and Arctic highs have linked and we looked primed for a very cold E/NE'ly.
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What even is happening to the GFS 12z by T300, I've not seen anything like this ever. Oh my the easterlies!
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7 minutes ago, Rocheydub said:
Seriously? On every run pre 96 you comment upgrade/downgrade all the time. Will you let it run it’s course until at least 120? The early nuances rarely have big impacts on the overall picture.
sorry if this sounds cranky, I’m tired and emotional!
Conversely, the pattern is extremely volatile within the 4/5 day time frame and will lead to differences thereafter and it is model discussion so why not comment pre 96? No malice intended I just don't see a problem!
Safe to say I think GFS 6z will get there, just appears to be a slower evolution. Less amplified as others have noted too!
Also the GFS is painting an extremely snowy 24 hours from T90 onwards.
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GFS P 18z, by T102 it is clear that much more energy is being sent southwards in comparison to 12z.
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According to the GFS 18z, much of the UK spends between T162 to T384 under -8 uppers! That corresponds to 8/9 days in a row with temperatures not getting above freezing... almost!
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1 minute ago, kold weather said:
Here comes the trigger low that will hopefully set us into a long term stabe Greenland high type pattern swinging off the US coast. Will probably push the Scandi high towards our shores and make for a VERY cold set-up for the 26-28th Jan.
What trigger low are you on about? The one moving off into Eastern Europe?
ALERT: -14 uppers along the East Coast of UK!
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Anyone for -16'c uppers?; that cold pool over Scandinavia tho...
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Look at the Arctic High spreading towards Greenland, I'm confident that we'll see an easterly here. Hope we can see the heights out in the Atlantic link up.
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Nothing too much to note on GFS 18z at the moment by T66... The low coming off the US East Coast is a tad further west along with the rest of the pattern to the west of the UK. Fingers crossed for an improvement going forward now.
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3 minutes ago, P-M said:
Why? would you be able to explain for those (me included) as it helps to learn.
From what I know the trough drops into Europe too far east and not enough energy drops into Europe with it. This allows the high to move eastwards across us bringing westerlies.
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GFS 18z could well and truly lead on to a long lasting easterly for sure. The snow event at +132 for comparison, the uppers are slightly more marginal, M4 northwards most favourable.
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A widespread heavy snow event for all at +138 on the GFS!
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A warmer continental easterly here now by the GFS P. The synoptic pattern is there again but you just need that cold pool to feed on!
And then as if by magic we go on to form our own cold pool!
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2 minutes ago, ICE COLD said:
The icon 12z run goes to T180 mate .
My mistake I totally forgot!
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South West and Central Southern England Regional Weather Discussion 01/12/2018 Onwards
in Regional
Posted
I do have slight random coverings here but obviously am much further east compared to you.