danm

B87 that’s interesting. From what I’ve read, apparently the CS instrument overestimates sunshine in hazy or broken cloud conditions, which is why the KZ readings are adjusted up to match the old CS readings.

Northwest NI yep, UHI, urban heat island. Clearly seen with London still at 17c, Brum 13c, Manchester 15c.

Got this from the Met Office when querying why their anomaly maps show the corrected sunshine totals, but the number totals listed against each station are the lower, raw figures: There are two types of sensor the Kipp & Zonen and the Campbell Stokes. The Heathrow measurements switched from Campbell Stokes (an older style of instrument) to the newer Kipp & Zonen instrument in September 2005. After the switch the new measurements are adjusted to match the old, to give us a consistent measurement across the UK and a homogeneous time series for that station. The adjustment we use for these monthly data can be explained in an a published paper describing the problem and a similar adjustment (but NOT the one we use) which could be applied to daily data. You can find that here: https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/wea.2288. We don't use this one because we don't grid the daily sunshine data, only the monthly. The newer instrument is adjusted to match the earlier one, to keep the UK measurements and the timeseries consistent. We list the observed, unadjusted data in the station files, but we map the adjusted data, because the network is a mixture of both sensor types (the key which describes which sensor is used for each measurement is at the top of the file, Kipp & Zonnen is marked with a #).

Some definite UHI effects going on this evening…

In Absence of True Seasons yep feels like a proper balmy Summers evening out there.

Very quiet in here tonight…. The ECM is a bit of a corker for next week:

Still feels warm out there. A proper balmy, late Spring evening at last. Still 19c at 8pm. Feel for those in parts of the SW, really caught the short straw over the last couple of days.

Met Office anomaly maps are out for April. Overall, it was about average for temperatures... Unsurprisingly for most areas, it was wetter than average... ...and again, unsurprisingly, it was duller than average almost everywhere... Looking at the number of days of rainfall, it was above average almost everywhere for days of rain over 1mm: ...but in terms of the number of days with rainfall above 10mm, it's the north and west that have been above average: So exceptionally wet in these parts, which can seen on the overall anomaly maps for rainfall totals with the far NW of England and S Scotland. Here are the actual values for reference:

Met Office anomaly maps are out for April. Overall, it was about average for temperatures... Unsurprisingly for most areas, it was wetter than average... ...and again, unsurprisingly, it was duller than average almost everywhere... Looking at the number of days of rainfall, it was above average almost everywhere for days of rain over 1mm: ...but in terms of the number of days with rainfall above 10mm, it's the north and west that have been above average: So exceptionally wet in these parts, which can seen on the overall anomaly maps for rainfall totals with the far NW of England and S Scotland. Here are the actual values for reference:

Warm, muggy late afternoon, about 19c/20c currently. Been quite gloomy but warm day with only a few sunny spells, but decent sunshine now.

A few sunny spells and 20c currently. Not too bad at all.

Back to the cloud this morning, although it should hopefully clear up this afternoon. Lights winds, dry and feels mild out there, so perfectly useable.

Alderc 2.0 maybe, maybe not. Let’s see what the morning runs say. ECM mean also still looking very good.

WYorksWeather GFS mean still looks good. Probably just an Op run wobble.

MP-R Bristawl Si zoomed in on the map for 3pm. Shows 14c west of Bristol and 15c east of Bristol. But it may be missing some sites.

Scorcher almost a stationary front down there, with steady rainfall all day.

Quite a temperature contrast today:

cheeky_monkey I love snow, but to get it on 30th April must be a real kick in the balls.

20c in London at the moment, at Northolt. Wasn't expecting a day as nice or as warm as this at the start of the week.

In Absence of True Seasons please tell me you’re not complaining and zooming in on a patch of sky with cloud Still lots of sunshine out there despite some cloud bubbling up.

Northwest NI haha very true, although I’ve actually been in back to back meetings which probably explains it. But here you go. 19c with sunny spells at the mo: