On Wednesday, August 2, 2017 at 10:09:21 AM UTC+1, wrote:
On Wed, 2 Aug 2017 01:38:51 -0700 (PDT)
Graham Easterling wrote:

On Wednesday, August 2, 2017 at 9:22:39 AM UTC+1, wrote:
Perhaps I'm wrong, but to me this summer seems to have been constantly
humid down here in London regardless of temperature or cloud cover. Is this
actually the case or am I imagining it?

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Spud

You're not imagining it.

Skybus from Lands End to Scilly are having a terrible year of flight
cancellations due to cliff top fog & warm sector mist.


The specific humidity has been high but not always the relative humidity. RH
always goes up at night of course.

Will
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The RH has been significantly high overall here.

I was speaking to someone at Skybus (I used to work for them) and this summer is set to break the record for flights cancelled due to fog (from Land's End), often of the warm sector / cliff top variety, rather than sea/coastal fog. They don't fly at night (Flights from approx 08:00 to 20:00). There have been several days with no flights whatsoever, including 1 day I was booked on.

No flights today again view towards the airport from Sennen http://www.sennen-cove.com/harbourcam.htm

In partial answer to Spud, the offshore SST was way above normal May to mid July, 18C-19C even out at Sevenstones early July, and I recorded 17C off the Battery Rocks Penzance in May, shattering what I'd recorded at that time of year before.

It has dropped back to near normal now, with the very disturbed conditions increasing the mixing. http://polar.ncep.noaa.gov/sst/rtg_l...maly_oper0.png .

Graham
Penzance