Highest UV of the year at Camborne

[Graham Easterling]

It might be almost 4 weeks since the summer solstice, but with a warm sector ridge from the Atlantic, clean air, and some thin medium level cloud to reflect off, the highest UV of the year at Camborne.

Hasn't managed to reach 10 for a few years now, and it's too late this year.

Graham

Penzance

[Nick Gardner]

My highest UV today was 8.2, it was cloudy around the point of highest sun so I suspect it would have been higher.

The highest UV this year was 9.4 on the 14th June and the highest this month was 9.3 on the 7th.

These are the dates when I have recorded UV at 10.0:

11/6/21

21/6/16

27/6/20

7/7/20

14/7/14

16/7/16

With the sun still just over 61°, a little less than 2° lower than at solstice, there seems to be time for another UV of 10.0 or two, though it'll have to be quick!

I think the data from UV Index Graphs from DEFRA are 'rounded' using a rolling average as they produce a far less 'spiky' plot than mine. Therefore, any brief peaks are smoothed-out.

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk

[Graham Easterling]

There have been a few days when there was no UV report from Camborne, so I should have said the highest UV recorded at Camborne this year. Sadly no reports from St. Martin's these days.

Lovely still evening today. Unusual to have E visibility with temperatures this high, it's not the normal mucky continental air. I've just got back from Newlyn Green, and the Lizard point is really sharp, visibility must be >20 miles. Prom 21:00.

Jack might be interested to know that what wind there is is offshore, and that rippled area of sea was in much the same place all the time I was out (19:30-20:30). I can only assume it's where air descending off the moors behind Penzance hits the sea. If you read this Jack, I'd welcome your opinion. The glassy areas either side are not due to algae (which can have that effect), those areas really are calm. The area which catches the wind moves slightly, but very slightly.

Graham

Penzance

[Graham Easterling]

Actually, looking at the clouds they do look on the lenticular side, if not good examples, so my theory is probably correct.

graham

[jack.h...@gmail.com]

Lenticualrs.  I have only just seen the original post.

I can’t offer a great deal of help.  Lee waves as used by glider pilots, do not always manifest as lenticular.  Equally, lenticulars do not always imply [useful] wave.  But there is of course a signifcant correlation.  One thing that gliders have noted is the a wave train is often more clearly defined over a flat surface, such as a sea.  In mountainous terrain, the pattern is often confused.

Yesterday here was what appeared to be an obvious example of wave clouds.  But the satpics showed nothing to indicate wave, nor did the glider pilots.

Note the early harvest (for these parts).  Barley cut by 14th July.  It’s been very dry but not especially sunny (as would show on a recorder) but the skies have been predominantly bright.

Jack