Coldest on Tuesday night: Braemar -2.5°C min / Mildest: St Helier (Jersey) 10.5°C min / Coldest on Wednesday: Lerwick 9.1°C max / Warmest: Auchincruive (Ayrshire) 19.4°C max / Wettest: Killowen (NI) 35 mm

[Colin Youngs]

Wednesday 23rd April 2025


Meteosat MSG satellite picture from Ferdinand Valk’s site at 12.00 UTC  https://www.fvalk.com/images/Day_image/MSG-1200-EUR.jpg      

Meteosat MSG satellite picture from Bernard Burton’s site at 12.00 UTC    http://www.woksat.info/etcahd23m/ahd23-msg-1200-uk.html

MetopC satellite picture from Bernard Burton’s site at 10.30 UTC   http://www.woksat.info/etcahd23/ahd23-1030-b-uk.html                                                      

Latest satpic animation from sat24.com   https://www.sat24.com/en-gb  


Both SYNOPs and climatological sites for all sections this evening.



UK min. temps on Tuesday night  http://www.ogimet.com/cgi-bin/gsynop?lang=en&zona=uk&base=bluem&proy=orto&ano=2025&mes=04&day=23&hora=18&vtn=Tn&Send=send

Achnagart (Glenshiel) 1.3°C,  Kinbrace and Redesdale 1.0°C,  Shap 0.9°C,  Strathallan 0.3°C,  Kielder Castle -0.1°C,  Tyndrum -0.8°C,  Aviemore and Aboyne -1.1°C,  Balmoral -1.7°C,  Tulloch Bridge -1.9°C,  Braemar -2.5°C.  

Shoreham and Guernsey Airport 9.4°C,  Culdrose 9.5°C,  Swanage and Thorney Island 9.7°C,  Chivenor and St Catherine's Point 9.8°C,  Portland and Gosport 9.9°C,  St Mary's Scilly and Jersey Airport 10.1°C,  Bude 10.4°C,  St Helier (Jersey) 10.5°C.

UK max. temps on Wednesday   https://www.weatheronline.co.uk/weather/maps/observation?LANG=en&CONT=ukuk&LAND=UK&REGION=0003&SORT=3&UD=1&INT=24&TYP=tmax&ART=kartealle&RUBRIK=akt&DATE=1745427600&CEL=C&SI=mph    

Lerwick 9.1°C,  Fair Isle 9.7°C,  Boulmer 10.0°C,  Baltasound 10.1°C,  Morpeth (Cockle Park) and Goudhurst (Kent) 10.2°C,  Kenley 10.4°C,  Langdon Bay 10.6°C,  Inverbervie 10.9°C,  Frittenden (Kent) 11.1°C,  Loftus and Lake Vyrnwy 11.4°C.

Glasgow Bishopton and Crosby 17.2°C,  Machrihanish 17.3°C,  Castlederg and Port Ellen on Islay 17.7°C,  Myerscough (Lancs) and Plymouth Mount Batten 17.8°C,  Blackpool Airport 17.9°C,  St Mary's Scilly 18.1°C,  Prestwick 18.2°C,  Achnagart (Glenshiel) 18.5°C,  Auchincruive (Ayrshire) 19.4°C.
   
OGIMET summary   http://www.ogimet.com/cgi-bin/gsynres?lang=en&state=United+K&osum=no&fmt=html&ord=REV&ano=2025&mes=04&day=23&hora=18&ndays=1&Send=send

UK rainfall totals in 24 hours to 18.00 UTC on Wednesday  https://www.weatheronline.co.uk/weather/maps/observation?LANG=en&CONT=ukuk&LAND=UK&REGION=0003&SORT=3&UD=1&INT=24&TYP=niederschlag&ART=kartealle&RUBRIK=akt&DATE=1745431200&CEL=C&SI=mph  

Northolt and Herstmonceux 17  mm,  Lough Fea and South Newington (Oxon) 18 mm,  Glenanne, Astwood Bank (Worcs), Haverfordwest (Scolton Country Park) and  High Beech  (Epping Forest) 19 mm,  Murlough (NI) 20 mm,  Libanus (Powys) and Whitechurch (Pembrokeshire) 21 mm,  Cardiff (Bute Park)  22 mm,  Lake Vyrnwy 23 mm,  Usk (Monmouthshire) 24 mm,  Killowen (NI) 35 mm.  


Rainfall radar  https://www.netweather.tv/live-weather/radar    

Sferics  https://www.blitzortung.org/en/historical_maps.php?map=10   Review  24h Loop

Location of stations   https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-synoptic-and-climate-stations

Colin Youngs
Brussels

[Julian Mayes]

I think that today's temperatures are worth a comment or two.  The chilliness of Kent was evident from Colin's list but I was unable to persuade him to extend the hi max list to include London's St James' Park with a max of 12.4C.  Not exceptionally cold for April of course but it is unusual for a London site (especiaIly that one!)  to be near the coldest sites.  

Nice to see Auchincruive (South Ayrshire, just inland from Ayr) top of the list, a nice change from places around here in the South East.  

Julian   -   doing my bit to promote the climate station network.   

[Graham Easterling]

Yes, it could do with a bit of support.  Nothing official along the whole of the south coast of Cornwall. Just checked on Google Earth and it's around 75 miles in a straight line from the Tamar to Gwennap, the actual length of coast is > double that. When the Penzance site was closed the then district council (Penwith) did their upmost to get it re-opened. The exposed Culdrose plateau is miles away (climatically) from sheltered south coast locations.

Such a shame the network been allowed to decline to the point where the hottest and coldest place will soon be the same.

Graham

Penzance

[Julian Mayes]

I was not grumbling about the extent / decline of the climate station network, so perhaps I should try to make my point more clearly.  When I wrote in support of the network I was referring to the availability and reporting of climate station observations, as opposed the synop network.  

The 'younger generation' who have always obtained their weather information from the internet will see a variety of sources showing the synop observations (eg. Ogimet etc).  The climatological network (i.e the WMO99xxx sites) is not made available on most sites with the exception of weatherobs.com - thanks to MetDesk for that bit of enterprise. But the presentation of the latter site does not allow easy comparison of readings - for example, in constructing the daily lists of extremes that Colin so assiduously does.  I'm lucky in having access to a website (not in the public domain) that does map the data from most of the clim sites that are automated. Each evening I supply these to Colin, hence his lists are a mix of synop and clim stations.   I'm biased, of course!  But I don't think that people have a full view of the fascinating variety of local climates in the UK if they do not consider the full MO network.  

You might ask - does this distinction matter any more - one AWS is like another.  Well, the main difference is this availability of observations.  We are all entitled to see such data and with the internet it does not need to be published on paper - it should all be published in near real-time.  I had this discussion on twitter a year or so ago and to my surprise, the Met Office CEO, Prof Penny Endersby promised to investigate the issue of publishing of data.  Without a Monthly Weather Report the climate data of some sites in invisible at present.  We only know of the existence of non AWS clim stations when they appear in the extremes listing of the Daily Weather Summary. 

Finally, returning to Graham's point about the south coast of Cornwall, the closure of Falmouth Observatory is a huge loss (I assume it is closed) as it was one of the C19th observatories opened at the dawn of weather forecasting.  

Julian  

[Graham Easterling]

Thanks for that Julian. I'd totally agree when you say " I don't think that people have a full view of the fascinating variety of local climates in the UK if they do not consider the full MO network.  " Cornwall, as an example, has very differing climates over short distances.   I've recorded a maximim of near 10C different to Camborne on a few occasions.  The fact that you have a NNW facing coast only a few miles from a mainly SSE facing coast, separated in many cases by moorland. It is so much sunnier right on (often within a few 100m) of a windward coast, due to a number of reasons. Convergence, down to the opposing sea breezes, or/and frictional convergence over the land, which also concentrates rainfall down the spine. Thin Sc dissipating at the seaward edge of the sea breeze circulation, to be replaced by Cu just inland etc. 

Going back to the station closures, following Falmouth, Penzance closed. I won't go in to the events that lead up to it, as I was involved in trying to keep it open, and have detailed the sad events before, but it was effectively the last south coast station in the list. We are left with Cardinham, on the edge of Bodmin moor, the exposed hill top airports of St Mawgan, Scilly & Culdrose and Camborne. That's basically it. I always wondered why that was the reason for the forecast temperatures being so low for Penzance, but whatever the reason, the MetO temperature forecasts have been vastly improved since the last update.

One down side of AWS (and there are many upsides) is that observers of the type that join COL, are a dying breed. Another is records tend to be less complete, the old maximum and minimum thermometers tend not to break down. I also think that comparing TBRs with traditional gauges is it bit of a black art.

Showing my age I think.

Graham

Penzance

[Keith (Southend)]

I didn't know about the weatherobs site, although just looking the climate station don't show max/mins, well not at the time I've just looked.

Thanks

Keith (Southend)