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A milder, wet & windy interlude now develops...

Ian Fergusson | 08:52 UK time, Monday, 1 February 2010

UPDATE, 12:40hrs, FRIDAY 5 FEBRUARY 2010:

Almost feeling like spring today, isn't it?

We've seen some glorious morning sunshine and temperatures widely reaching 10C (50F) today across the West Country. However, the clouds are tending to grow more readily as I look out of the window here in South Gloucestershire and yes, we'll see some showersÌýacross some districts, some potentially thundery. Nonetheless, it's a pretty pleasant end to an otherwise largely inclement working week!

So, on to the future... remember where you put the ice scraper before this mild week began? Best to try and locate it once again...

My previous blog entry hinted at the return of colder weather this month and indeed that's now firmly on the cards for next week. However, just how cold things will getÌý- and for how long - remain aspects of considerable forecast uncertainty.

For the most part, I'm expecting our region toÌýexperience a largely dry, increasingly cold, frostyÌýbut otherwise rather unremarkable spell of weather for at least the first half of next week and quiteÌýpossibly for a few daysÌýbeyond that.

The current Met Office forecasts herald little risk of significant snow anywhere next weekÌýacross the British Isles and especially soÌýfor the SW and manyÌýsouthern-central areas of England.Ìý

However, we're expecting some accumulations to develop through Tuesday and Wednesday in eastern England, including parts of East Anglia and down towards the SE, as the increasingly cold air occasionally feeds-in snow across the North Sea to our shores.

There's also always a risk that Atlantic systems could progress far enough eastwards, into the pooled cold air, to bring snowfall into the West Country at some point later this month. Of course, we've seen this sort of snow-bearing mechanism already at work through this winter and a repeat performance is by no means impossible. On present reckoning however, it's an outcome of very low probability - at least for the next week.

Late next weekend (Sunday 14th)Ìý- based on the very latest Met Office modelling - there's aÌýprospect of heavy rain arrivingÌýinto the SW and parts of the South of England, from which some snow inland (away from the extreme SW)Ìýis a low probability consequence: indeed, less than 20% chance based on current analysis.

The forecast through to the end of the coming fortnight (10 to 15 days ahead)Ìýcontinues cold, with some potentially harsh overnight frosts for many but - as yet - a very muted signal for any prospects of heavy snow, despite a chance of the weather turning a tad more unsettled and windy at times.

I do stress it's all subject to change - I'll keep you updated through a new blog entry in due course.

Ìý

(ORIGINAL ENTRY follows)

If you're a motorist, you've probably fumbled for the ice-scraper beneath the passenger seat this morning.

However,Ìýafter today's frosty start, it's unlikely you will be needing it for the week ahead...

Indeed, at times over the next few daysÌýit will seem noticeably mild - certainly compared to much of the winter thus farÌý- as spells of wet and windy weather spread off the Atlantic toÌýgive heavy rain in someÌýdistricts during Tuesday, Wednesday and Thursday.

Across north-east England and indeed southern Scotland, we're expecting the colder conditions to prevail and here the advancing spells of rain will turn to snow at times. But there's no real risk of any snow for us here in the south.

Temperatures for most of us will be around the seasonal average - perhaps a notch higher for a whileÌýinto Wednesday and Thursday - but we're still expecting things to turn somewhat colder again laterÌýthe following week.

met-office-synopsis-friday05feb-12z.jpg

The latest Met Office synoptic chart for midday, Friday 5 February 2010. It continues a theme of a somewhatÌýmilder - and wetter - flow prevailingÌýthis week,Ìýas Atlantic depressions cross the country to bring some spells of heavy rain and quite strong winds forÌýmany districts.

The prospect of a profoundly cold spell of weather, as the Met Office suspected could ariseÌýwhenÌýI wrote my last blog,Ìýis not altogether impossible but hangs in the balance.Ìý Turning colder - eventually and by a rather uncertain marginÌý-Ìýstill remainsÌýthe expected outcome after this milder interlude.

Based on current analysis by the Met Office, the most likely scenarioÌýis for the wet and windy conditionsÌý(gales, even perhaps severe gales) to lessen somewhat into the weekend, with an unsettled showery but still rather mild flavour to our weatherÌýprevailing into the midweek period thereafter... after whichÌýthings will probably start to turn colder.

Crucially, there's a wide spread of pressure patterns developing in the model ensembles around that sameÌýtimeÌýand so confidence on the type of weather we'll seeÌýremains low... for now.

However, the models are suggesting a steadily decreasing chance ofÌýheavier precipitation into that 10-15 day period. There's little signal in the current crop of supercomputer forecasts for significant snowfall at low levels and so on balance, the Met Office is suggesting we'll see some hill snow at times - initially in northernÌýEngland and then progressively more widely - and someÌýlighter outbreaksÌýat lower levels at timesÌý(at least whereÌýsouthern districts are concerned).

It's of course an evolving story, but at the time of writing, dry(ish), cold (perhaps very cold) weather, with aÌýlikelihood of very hard frosts,Ìýseems the broaderÌýstory into the 10-15 day period, but for at least the next 7 days or so we're expectingÌývery muchÌýthe opposite!Ìý

So, never mind finding that ice scraper tomorrow morningÌý- you'll be reaching for the brolly instead...

Ìý

Ìý

Comments

  • Comment number 1.

    Interesting update, thanks Ian. Even more so as I had just finished reading this morning's update on the ´óÏó´«Ã½ Weather site for the month ahead by Jay Wynne (posted at 10.00am this morning) which states that after the mild interlude this week it will then be VERY, VERY COLD with snow at times in southern districts next week. But now you're saying mild well into next week. Surely Jay Wynne's update cannot be out of date already!! Interesting times ahead I think.
    Thanks again for your interesting updates as always. By the way, we missed out yesterday on any of the snow here in Devizes, but I understand some places not too far away (Berkshire/Hampshire way I think) had a good covering.
    Ian

  • Comment number 2.

    Hi Ian,
    Yes, there was also snow into parts of Gloucestershire overnight too - of sufficient quantity to cause a few localised problems on some roads.
    The complications into next week arise in terms of the exact timing of a return to colder weather. As noted in my blog (and reflecting Jay's comments - he may already have seen even newer analysis from the folks at Exeter), a return to potentially very cold weather is by no means impossible, with attendant risk of snow at times (including to lower levels) albeit the signal for heavy snow is presently muted.
    However, we're shortly to see the revised Met Office guidance for the 6-10 / 10-15 day period and I'm sure we'll find various changes in their briefing emphasis, subtle or otherwise, based on analysis of this morning's crop of model runs.
    I'll reflect any such developments here on the blog -
    Best
    Ian


  • Comment number 3.

    Hi again Ian,
    Further to my last, I've now seen the Met Office's analysis of the various midnight model runs and little has changed in terms of the emphasis I've offered in the blog so far. To cite the Met Office's own phrase, they are "...more inclined towards a colder type" developing, despite some key differences between certain model ensembles (EC and the Met Office's own MOGREPS - the latter is wanting to retain a largely SW'ly rather than much colder E/SE'ly). Despite this however, all the ensembles do agree on a cooling trend, with EC noticeably the coldest; GFS and MOGREPS somewhat less so. Meanwhile, the signal for any significant snowfall remains weak and continues to have broader model support.
    At this stage, the Met Office is leaning towards the EC's notion of the colder easterly but the timing of any such change - as noted in my blog - remains very much subject to doubt. Current assumption is for colder conditions to establish into eastern districts of England from about Tuesday next week, heralding a return of attendant snow risk albeit without any strong signal - yet - for anything significant at lower levels. Pressure pattern signal still remains extremely mixed, too.
    Best
    Ian

  • Comment number 4.

    Thanks Ian for your explanations. It seems to be a tough one for the models to handle. Personally I would prefer cold, sunny and frosty to milder and wetter; this morning is horrible for instance (grey, damp and certainly less cold).
    I moved to Wiltshire in 1981 and the last few winters remind me very much of the winters in the 1980's. Perhaps the weather cycles have shifted again towards colder winters - do you think that could be the case, or is it just a fluke that we've had more cold & snow in recent years?
    In your personal opinion, will the cold "win the battle" next week, or the Atlantic?
    Ian

  • Comment number 5.

    Morning again Ian, just thought I'd sign in to report that whilst I was walking to work this morning it was SNOWING here in Devizes (I think this is the 4th Wednesday on a trot it's snowed!). Nothing's settled, but it started as snow mixed in with rain, then became very fine sleety stuff and then full on big snowflakes. It's stopped now but I thought I'd mentioned it as all the national forecasts have been emphasising the "mild south" for last night and this morning. Clearly the cold air come further south than anticipated?

  • Comment number 6.

    No snow on the A417 today - a few flakes of what might have been snow or sleet in the headlights near Purton this morning. The commuting "ice truckers" live to fight another day.

  • Comment number 7.

    Hi Ian,

    Great news about the colder weather going into next week, might be seeing a few more days of school next week, you talked about an easterly developing on ´óÏó´«Ã½ Radio Gloucestershire this morning, do you think that we could have the same setup as we had last year? (early February).

    Jack

  • Comment number 8.

    Interesting update thanks Ian.
    I am happy to report that it's sunny and springlike in Devizes at the moment!
    I welcome the colder weather next week if it means no rain!

  • Comment number 9.

    Greetings from the "ice road truckers" of the A417 after a week of relatively clement weather; almost spring like in Gloucester today. Not so keen on yet another cold spell, especially as we are on the eastern edge of the SW and so most vulnerable to the snow. Unlike Ian in Devizes, I would prefer warm wet westerlies, rain over cold for me any time.

  • Comment number 10.

    No snow in Gloucester or on the A417 today but, on arriving back in Swindon at tea time was surprised to see cars with snow on roofs and bonnets, also a dusting on our parking area and back garden. Bring on the wet westerlies.

Ìý

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