Andy_Calafell_Sheffield
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Everything posted by Andy_Calafell_Sheffield
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Yep PIT, looks that way ... been looking at the ppn charts for the last day or so and it has consistently shown the band weakening considerably down the spine of the country, leaving us with only a short period of lightish snow. This has been my biggest concern, was always confident everything else was conducive to snow for us.
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I hope so but c'est la vie if it does ! ... I remember quite a few of the more marginal times when I've got some significant snow here due to my elevation and you've been stuck with a slushy covering that quickly thawed. It's all swings and roundabouts ! But let's hope we both get a good solid covering for a change.
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Exactly ! only managed a "sugar coating" last night ... the only thing thats worrying me is that from looking at the NMM model, the ppn seems to split and pull away eastwards around the humber. Hopefully this will not be the case, and the bbc and MetO seem pretty bullish about it making its way down the spine of the country.
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Yeah, I do hope so. It seems like sometimes you can get situations where the uppers and dews don't seem that favourable if we saw them on the models but have still produced some quite memorable snowfall events ! ... Hopefully what could help the eastern end of the region is that the band looks like it may be heavier the further east you go, so may help to compenseate for the other areas of marginality.
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Admittedly, places on or near to the coast may struggle to see any settling snow, but you could expect this due to the warm north sea nearby. However, for other places, dew points max out between 0 and 1 in the very east of the region, and less the further west you go, we are all sub 528 dam quite easily, and the uppers raise to about -4 for a short period of time and with cold surface air entrenched, and the ppn arriving at night time, I feel it should be enough to give most areas a decent amount of settling snow.
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Although quite an IMBY post, I think that tomorrow night front will give a much better chance to those areas who haven't recieved, much, or anything in the way of snow yesterday and this morning. It is looking quite good for the central strip of the region, with more favourable dew points, temepratures and in some other areas elevation (which may also help to provide more ppn the higher up you are). I'm thinking maybe 2-3 cms on low ground and towards the coast, with around 5cm for many areas above 100m, and perhaps upto 10cm in some lucky areas with some decent elevation (250m+).
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Model Output Discussion
Andy_Calafell_Sheffield replied to reef's topic in Forecast Model Discussion
Once more, another different varaiton of the output from the GFS, this time with the HP only centered over us until FI. Hopefully, one of the tiny things we can take away from this is that maybe the models still are undecided with the pattern that will take hold, and sometimes this uncertainty can sometimes be good as the models are not used to such synoptics. -
The only thing which is helping further south is due to the evaporative cooling effect of the heavy precipitation, the other factors are indeed even more marginal. Hopefully the temperatures will begin to peak shortly, so let's hope we see some heavier precipitation to give us some evaporative cooling effect to counteract the increasing temp and dp's :lol:
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Sorry, my mistake, I didn't check the dewpoints ! I'm presuming mine must be around -1 at the moment with a temperature of -0.3. Hopefully because I have a tiny bit of altitude, I might just be able to stave away the effects of the rising dew points, even when they peak. Do you think that is possible or as the charts are already wrong that it could look a little more hopeful of the dp's staying low enough?
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No it does not, I think that perhaps that little low that appeared on the south coast earlier may have reduced the warm air advection brought in by the low and allowing the colder uppers to remain intact. I thought things were a little strange when at 5 o'clock the temperatures hit 0. Still, lets not get out hopes up too much but things could look good for this evening. I think our snow shield must be out for repair at the moment !
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Temperature of -0.4 here in SE Sheffield at 200m with light snow that has covered all surfaces, including the roads. I didn't think that it was meant to be this cold at this time? ... and aren't the thickness values and 850's supposed to become more favourable from about 9 o'clock too? The band of intense ppn finally has started moving north eastwards, hopefully I will see some slightly heavier ppn here by around midnight towards the early hours? Is this possible?