In the fourth part of a series of articles about the coldest, warmest, sunniest and now the wettest place across the country, you’ll notice this is for the UK and not the British Isles or Iona if what you prefer to call this group of islands, that’s because I’ve used the 06-06 UTC rainfall totals, and for some reason the Irish stations don’t include this 24 hour total which is a shame. I could have added the two 12 hour rainfall totals but that needs a bit more coding so maybe next time.
As you can see from the table of wettest days is dominated by Capel Curig in Snowdonia with a total of 40. On the map there is a good smattering of stations across central England that were never the wettest place in the UK during 2017.
The wettest 06-06 total of the year occurred on October 14th when, where else but Capel Curig, reported 87 mm of rain, in fact Capel Curig has 12 top twenty entries in wettest day of the year table. Without a few more rainfall reporting SYNOPs in the northwest of Scotland, Capel Curig will continue to top the wettest station in the UK.
It maybe that Storm Dylan has developed a bit of a sting jet in the last few hours. I’m no expert, but this was anticipated by some but came as a surprise to me, if that indeed is what the latest frames of the IR satellite image (fig 1) and the weather radar (fig 2) are showing across western Scotland at 07 UTC.
Of course this all may be the work of an overactive imagination and just a curl of frontal cloud and precipitation from the bent back occlusion getting sucked into the vortex of Dylan.
The cold air that dug in behind yesterday’s low Edilbert turned the rain to snow overnight as it cleared away eastward across southern areas and closing Stansted and Luton airports this morning as it did so. Top marks to the Met Office, their yellow warning for rain and snow was spot on for this event.
Here are the 24 hour precipitation totals across England and Wales up to 06 UTC this morning.
High rainfall accumulations over Christmas in some places across the country, but particularly so in southwest of Scotland and northwest of England (fig 1). It’s a good job the rainfall shadow effect is working at optimum efficiency.
Today’s warning of heavy rain for the Lake District does look a little parochial on the part of the Met Office (fig 1). It’s not only the Lake District that’s seen some heavy rain, in the last 18 hours the southwest of Scotland has also seen its fair share of it too. The cold front seems to have become stuck a little further north than the precipitation totals from the model might have indicated, I say might, because we can ever see any of the UKMO NWP model output to say otherwise! Here’s what I estimate the totals have been across this part of the world from weather radar images since 18 UTC yesterday (fig 2). I’m sure that the Lake District will get some more as the front comes south later today.
If I’ve got my programming right, the latest 12 month precipitation accumulations at the end of November for the UK, are still on the low side for Central, Southwestern and Southeastern parts of England (fig 1). The daily precipitation data is from the UKP gridded set which I download from the Met Office. The lowest anomalies at the moment are across the Southeast with 85.9% of the 1981-2010 long-term average (fig 2). After a wet spell in mid-summer accumulations were creeping back close to average, but it looks like a dryish October and November has put them back into a deficit.
The index of reservoir totals for England and Wales looks close to normal (fig 3), despite a number of reservoirs in the south being on the low side.
Apart from the bright banding from the Dean Hill radar, the two interesting areas of precipitation accumulations for today are one northwest of London which produced a lot of snow today at High Wycombe, and the other area across central Devon and the Blackdown hills on the Devon-Somerset border (fig 1). The estimates from the weather radar for that area are in excess of 50 mm from 06 UTC this morning. I imagine that most of this will have been rain, but it has been snowing for most of the afternoon a little further northeast at Bristol Airport, so you never know. The only thing that I can attribute the band of higher totals to is the occlusion that aligned itself across central Devon for most of today. A severe flood alerts has been issued by the Environment Agency for the rivers Clyst and the Culm in south Devon (fig 2), that’s according to the FloodAlerts.com web application.