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Captain Shortwave

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Captain Shortwave last won the day on September 3 2023

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    Snow and frost in the winter. Hot and sunny, thunderstorms in the summer.

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  1. The GFS even more progressive with disrupting the area of low pressure close to the UK An evolution worth watching, I think milder air will push across most of the UK at the end of the week but an easterly through the back door so to speak could be possible. Just a shame that the 850s are not conductive for snow at this point.
  2. Whilst it is the worst solution the GFS does squeeze the best out of the outcome due to the fact that the first band of snow fizzles out before it turns back to rain. The UKMO looks to have been miles off with the low tracking further south. It seems to be a case of hoping in regard to the timing of the front. There is no point having the snow overnight and it being washed away by dawn for example.
  3. Late next week looks very delicate and very small differences can determine whether the low deepens towards the UK or runs through the channel as a shallow feature. The UKMO keeps the low separated from the main troughing which allows a much more southerly track, the GFS on the 06z not only connects the low but the cold pooling from Scandinavia connects to the PV moving towards Greenland at the time which seems to slow the low even further and deepen in situ as there is a gap to pull WAA ahead of the low over the UK, hence the snow to rain event. I wouldn’t place my money on either option yet to be honest. GFS Hard to spot but you can see the embedded troughing within that low extending out of Greenland. UKMO Much less pronounced and a more elongated and complex system. You could argue that the GFS is potentially over simplifying the set up into that one low when the reality could be a series of small systems that will gradually break eastwards. Original post: https://community.netweather.tv/topic/99814-model-output-discussion-22nd-jan-2024-onwards/?do=findComment&comment=5030205
  4. Late next week looks very delicate and very small differences can determine whether the low deepens towards the UK or runs through the channel as a shallow feature. The UKMO keeps the low separated from the main troughing which allows a much more southerly track, the GFS on the 06z not only connects the low but the cold pooling from Scandinavia connects to the PV moving towards Greenland at the time which seems to slow the low even further and deepen in situ as there is a gap to pull WAA ahead of the low over the UK, hence the snow to rain event. I wouldn’t place my money on either option yet to be honest. GFS Hard to spot but you can see the embedded troughing within that low extending out of Greenland. UKMO Much less pronounced and a more elongated and complex system. You could argue that the GFS is potentially over simplifying the set up into that one low when the reality could be a series of small systems that will gradually break eastwards.
  5. Not really commented much because the situation later next week is pretty fragile but obviously if the low ends up too far north then the flooding risks will return with a vengeance given the chances of several hours of heavy rain if the milder air remains in the south. Clearly the best solution is the low remaining south enough to given frontal snow with strengthening east to north easterly winds bringing showers in off the North Sea. The UKMO looks pretty much broadly wet for next Thursday, the GFS has snow over Scotland and the far north of England. At least the UKMO does have some heights behind the low unlike the 00z that had rapidly declining heights to the north west by the end of next week.
  6. Worth mentioning that only 24 hours or so ago we were looking at a broad west to south west flow for week 2, then the models are slowly started to make the Euro ridge more amplified and now we have subtle hints that the high could amplify enough to potentially establish a blocking high to the east or potentially even north east of the UK.
  7. The best thing for tonight into tomorrow is to expect nothing and be pleasantly surprised amid anyone has a dusting of snow. At the moment the front to the south is likely to stay off the coast and the snow to north is likely to die out before reaching the likes of Cambridgeshire/Norfolk etc. However in real time things may not pan out this way.
  8. The trend is there for the Euro ridge to amplify somewhat during week 2, which should bring drier and more settled conditions to the south. At the moment there is the potential for mild or very mild conditions, however if winds do back more southerly or south easterly then we could see a bit of a chill set in again, especially at night as drier air would allow skies to clear. Still a long way off and of course the models may trend this high further north in the coming runs, which of course could lead to much more interest.
  9. All we can do now is hope for the best. The cold air should be starting to dig in now, a cold one with a widespread frost. Generally -1 or -2c tonight Tomorrow looks cold with temperatures only getting a little above freezing. 1c, perhaps 2/3c in sheltered spots. It will feel cold and this is pretty much the range of the temperatures for the whole of the week. It is a shame that there doesn’t appear to be anything of note in terms of precipitation, potentially the system affecting the north could bring some patchy sleet/snow in the north of the region and likewise the same could happen with the low moving through northern France for southern areas. I am hoping something will crop up that could give something decent more widely.
  10. A pretty potent northerly is about to affect the UK with the -8c isotherm covering most of the UK by tomorrow afternoon. A bit of a shame that we appear to have some pretty awful luck away from immediate windward coasts, notably the wind being north to north west seems to take out most coastal locations by the North Sea and Irish Sea. Then the risk that the shortwave that cuts off the first northerly make pick up enough mild air to turn snow back to rain in places and the front approaching from the south west looks likely to make it to the English Channel but not beyond. Now luckily with fairly low and heights and a very cold airmass then things could crop up, some of the above could turn more in our favour. At this point I am not sure whether model watching is the right course instead we might be reaching the simply looking at the radar moment. Hopefully many do manage to get some snow out of this spell.
  11. A toppler by definition is a lea northerly in a generally mobile westerly pattern, as such it is more amplified than your bog standard PM airmass behind a set of Atlantic weather systems, but it is not sustainable for more than 24-48 hours. The pattern for this week certainly doesn’t illustrate this, the collapse of the blocking signal comes about because of events above the troposphere (the stratospheric vortex gets pushed the the north west of the UK by the strong warming event and that downwells resulting not only in the transfer of tropospheric low heights from the north east to the north west, but lowers pressure in general over the arctic (Feel free to correct any inaccuracies I might have spewed here). It is likely that we will see some more mobile whether, but how this comes about in reality is still a little up in the air (aka how far north or south the jet stream will lie), however once the current cold spell and breakdown Synoptics are out of the way, we may start to see promising output again from the models once they shake the “forever zonal” default state they seem to be in just at this moment. Original post: https://community.netweather.tv/topic/99760-model-output-discussion-colder-but-how-cold-and-for-how-long/?do=findComment&comment=5011423
  12. A toppler by definition is a lea northerly in a generally mobile westerly pattern, as such it is more amplified than your bog standard PM airmass behind a set of Atlantic weather systems, but it is not sustainable for more than 24-48 hours. The pattern for this week certainly doesn’t illustrate this, the collapse of the blocking signal comes about because of events above the troposphere (the stratospheric vortex gets pushed the the north west of the UK by the strong warming event and that downwells resulting not only in the transfer of tropospheric low heights from the north east to the north west, but lowers pressure in general over the arctic (Feel free to correct any inaccuracies I might have spewed here). It is likely that we will see some more mobile whether, but how this comes about in reality is still a little up in the air (aka how far north or south the jet stream will lie), however once the current cold spell and breakdown Synoptics are out of the way, we may start to see promising output again from the models once they shake the “forever zonal” default state they seem to be in just at this moment.
  13. That will be the Iceland shortwave that forms and cuts the northerly off. The parameters look borderline but if the system remains shallow it could easily deliver a spell of snow across northern England like the graphic shows.
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