West Cornwall - Warm Sunshine & superb surf.

[Graham Easterling]

Today the typical warm sector scenario of the western coast, at sea level, getting the best sunshine, but the slightest uplift it was cloudy or misty. So whilst Land's End airport at 300' or so was affected by poor visibility & low cloud, a mile away, down at sea level it was a glorious day. Also, the 1st of the big swells has arrived. 6-8' at times & clean. Sennen 14:15

Bigger wave forecast for tomorrow. Big Spring tides, so wave setup surges could possibly be an issue at Perranporth. There is a flood alert for the south coast. I think it's based on the fact the wind is onshore on the south, but here the swell is small & the tides are (using Newlyn) currently marginally below forecast astronomical levels despite the onshore breeze (high barometric pressure). It's the north coast swell height, not the wind direction/force, which I think is the significant factor. That's what I'd keep an eye on.

Graham

Penzance

[Nick Gardner]

Crystal clear visibility this afternoon so typical of warm sector air. I don't think any other airmass ever gives such clarity.

Temperature back above 20°C this afternoon for the first time since the 26th September. Maximum of 20.3°C. A very balmy evening out there now.

Meanwhile in the shelter of the south coast; I may have to go snorkelling tomorrow afternoon at low tide, with it being so low you can end up seeing things that you would normally have to dive with SCUBA gear on.

Mozzies have invaded the house.

-- 

Nick Gardner

Otter Valley, Devon

20 m amsl

http://www.ottervalleyweather.me.uk

[Len W]

Crystal clear visibility in  warm sector air Nick?

Not here. Usually have appalling visibility. Low cloud/fog.

Had fog this morning.

Eventually lifted to improve visibility but not crystal clear.

That sort of visibility comes with  polar air here.

Cold and clear between showers.

Len

Wembury

[Graham Easterling]

I have to agree with both - to a point! 

Yes, warm sectors can produce fog and mist, it's thick fog here now. But warm sectors & cold sectors can both produce excellent visibility, the lighting for each is quite different. You have the steely blue of a sunny colds sector, it looks cold & the contrast pick up things like distant waves breaking.

However, come out of some warm sector fog, and the visibility can be the absolute best. Sometimes it may simply lift into low cloud, and suddenly the rocks off the LiIzard point can be seen, so clear is the air. When I lived at Sennen visibility could flip to & from from being able to see Scilly really clearly (certainly 40mile visibilty), to a few hundred yards. It always amazes me that there is often so little of a transition zone.  (Any excuse to show this!)

I did reply direct to Nick, but my post was deleted, I've no idea why. I can only assume it was down to an example I gave, which I therefore won't repeat, but I was disappointed. I though it a good example.

Graham

Penzance

[Graham Easterling]

Also meant to say Len, I saw your part in the COL zoom meeting. Wetter here as well, if you'd like any monthly rainfall / temperature data let me know.

Graham 

[Freddie]

Hi Graham,

As far as I know I'm the only person who can delete other member's messages on here.  I certainly didn't intentionally delete any reply of yours, so feel free to re-post it if you wish.

-- 

Freddie

Alcaston

Shropshire

148m AMSL

http://www.hosiene.co.uk/weather/

Stats for the month so far: https://www.hosiene.co.uk/weather/statistics/latest.xlsx

On Friday, 8 October 2021 at 08:55:29 UTC+1 Graham Easterling wrote:

[Graham Easterling]

Thanks for the reply Freddie, I essentially made the same points in my reply to Len, so it's OK. 

I did think it strange it was deleted. It's marked as 'Message has been deleted' when I look at this thread. It has happened to me once before, also in a reply to Nick.

Graham

[Graham Easterling]

Yesterdays swell through the morning fog, just after the morning's high tide, makes the breakwater seem small. Boats pulled right up.

It's at time like this with wave setup surges sending the sea several feet above forecast astronomical levels for a couple minutes or so which makes forecast global warming sea level rise forecasts seem fairly insignificant. They are not of course.

Graham

Penzance

On Thursday, 7 October 2021 at 16:04:18 UTC+1 Graham Easterling wrote:

[Graham Easterling]

The same swell sent wave setup surges up the river through Bude.

Reported in the press as a tidal bore, it wasn't. Just a set of large waves around high tide raising the overall sea level for a minute or 2 and sending a surge up the river. On this occasion for quite some way.

Graham

Penzance