On Tuesday, 26 May 2020 15:22:04 UTC+1, Freddie wrote:
On Monday, 25 May 2020 14:25:39 UTC+1, Nicholas Randall wrote:
I look at the Met Office website and the temperature forecasts are too low and this makes me think the UV forecasts are also too low.

You should be aware that there isn't a link between temperature and UV level, so the above logic is incorrect. UV level is a function of the amount of absorption that occurs in the atomosphere, and this is largely determined by the angle of the sun's rays.

The simplest demonstration of this is the fact that UV level peaks around local noon, whereas temperature peak is 2-3 hours later.

Also, the summit of, say, Snowdon will experience a higher UV level than, say, Llandudno, as there is less thickness of atmosphere above to filter out incoming UV.

Factors such as low-level moisture, the presence of some cloud, and ozone also play a part.

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Freddie
Dorrington
Shropshire
115m AMSL
http://www.hosiene.co.uk/weather/
Stats for the month so far: https://www.hosiene.co.uk/weather/st...cs/latest.xlsx

I am aware there is no link between temperature and UV levels. I was stating the Met Office maximum temperature forecasts are low and I think the UV forecasts are also too low. Today the maximum temperature was forecast to be 18 C and the UV forecast was changed from 6 to 5.
I agree with most of what you state about factors that affect UV levels except humidity. I do not think it affects them.

Nicholas
Meir Heath, Stoke-On-Trent 250 metres above sea level.