Currently (09:00)
Penzance 15.3C
St Ives 8.6C in thick sea fog

There are normally a few days in Spring when there is a 10C difference between the north & south coasts (only 4 miles or so apart). Today could be one of those days.

Graham
Penzance

On Wednesday, April 15, 2015 at 9:07:52 AM UTC+1, Graham Easterling wrote:
Currently (09:00)
Penzance 15.3C
St Ives 8.6C in thick sea fog

There are normally a few days in Spring when there is a 10C difference between the north & south coasts (only 4 miles or so apart). Today could be one of those days.

Graham
Penzance

At 10:00 just 8.4C at St Ives, similar at Camborne.

With the wind east of north, it's clear out at Sennen, I'm pleased to say, though you can see the fog coming around the Cape at times http://www.sennen-cove.com/harbourcam.htm .

It's often quite blustery on the edge of a bank of sea fog, when it's basically calm in it and a couple of miles clear of it. I've never been quite sure why, I assume it's down to the sharp temperature contrast, but I'm open to ideas.


Graham
Penzance (Sunny)

There are normally a few days in Spring when there is a 10C difference between the north & south coasts (only 4 miles or so apart). Today could be one of those days.

Graham
Penzance

14:00
19C Culdrose
18C Penzance
11C Camborne
9C St Ives http://www.nci-stives.org/weather/Cu...antage_Pro.htm

So a 10C difference N-S across west Cornwall achieved today.

The current MetO forecast for Camborne at this time is 14C, Penzance 15C, just 1C difference.

Graham
Penzance

On Wednesday, 15 April 2015 10:10:05 UTC+1, Graham Easterling wrote:
On Wednesday, April 15, 2015 at 9:07:52 AM UTC+1, Graham Easterling wrote:
Currently (09:00)
Penzance 15.3C
St Ives 8.6C in thick sea fog

There are normally a few days in Spring when there is a 10C difference between the north & south coasts (only 4 miles or so apart). Today could be one of those days.

Graham
Penzance

At 10:00 just 8.4C at St Ives, similar at Camborne.

With the wind east of north, it's clear out at Sennen, I'm pleased to say, though you can see the fog coming around the Cape at times http://www.sennen-cove.com/harbourcam.htm .

It's often quite blustery on the edge of a bank of sea fog, when it's basically calm in it and a couple of miles clear of it. I've never been quite sure why, I assume it's down to the sharp temperature contrast, but I'm open to ideas.


Graham
Penzance (Sunny)

In the fog the vertical temperature profile will be different from that outside it. The fog is cooler at the surface but at a level above the fog the temperatures should be the same. Maybe this difference in lapse rate and the consequent difference in turbulence would explain the effect. I'm not an expert on sea fog, nnedless to say.

Here, the temperature has climbed to 24.2°C which seems almost unfeasibly high. But the screen is nice and clean and there is westerly breeze, about force 3. The thermometers, I know, are OK. Maybe the Surrey Tableland(tm) is Britain's answer to the Tibetan Plateau, a high-level heat source.

Whatever the case, the weekend will be quite a nasty contrast in this part of the world.

Tudor Hughes, Warlingham, NE Surrey, 557 ft, 169 m.

On Wednesday, April 15, 2015 at 2:53:46 PM UTC+1, Graham Easterling wrote:
There are normally a few days in Spring when there is a 10C difference between the north & south coasts (only 4 miles or so apart). Today could be one of those days.

Graham
Penzance

14:00
19C Culdrose
18C Penzance
11C Camborne
9C St Ives http://www.nci-stives.org/weather/Cu...antage_Pro.htm

So a 10C difference N-S across west Cornwall achieved today.

The current MetO forecast for Camborne at this time is 14C, Penzance 15C, just 1C difference.

Graham
Penzance

Popped out for a pint on the prom. Just got back.

It's currently 18.6C in Penzance, 9.2C in St Ives. Just 4 miles away as the crow flies.

Warmest day of 2015 so far.

Graham
Penzance

On Wednesday, April 15, 2015 at 3:16:44 PM UTC+1, Tudor Hughes wrote:
On Wednesday, 15 April 2015 10:10:05 UTC+1, Graham Easterling wrote:
On Wednesday, April 15, 2015 at 9:07:52 AM UTC+1, Graham Easterling wrote:
Currently (09:00)
Penzance 15.3C
St Ives 8.6C in thick sea fog

There are normally a few days in Spring when there is a 10C difference between the north & south coasts (only 4 miles or so apart). Today could be one of those days.

Graham
Penzance

At 10:00 just 8.4C at St Ives, similar at Camborne.

With the wind east of north, it's clear out at Sennen, I'm pleased to say, though you can see the fog coming around the Cape at times http://www.sennen-cove.com/harbourcam.htm .

It's often quite blustery on the edge of a bank of sea fog, when it's basically calm in it and a couple of miles clear of it. I've never been quite sure why, I assume it's down to the sharp temperature contrast, but I'm open to ideas.


Graham
Penzance (Sunny)

In the fog the vertical temperature profile will be different from that outside it. The fog is cooler at the surface but at a level above the fog the temperatures should be the same. Maybe this difference in lapse rate and the consequent difference in turbulence would explain the effect. I'm not an expert on sea fog, nnedless to say.

Here, the temperature has climbed to 24.2°C which seems almost unfeasibly high. But the screen is nice and clean and there is westerly breeze, about force 3. The thermometers, I know, are OK. Maybe the Surrey Tableland(tm) is Britain's answer to the Tibetan Plateau, a high-level heat source.

Whatever the case, the weekend will be quite a nasty contrast in this part of the world.

Tudor Hughes, Warlingham, NE Surrey, 557 ft, 169 m.

Thanks Tudor, sounds reasonable. When a bank of sea fog moves towards shore it is often associated with a sudden onset of a fairly gusty wind. Often you can see the effect on the sea surface just ahead of the fog bank.

Once under the fog it's typically still again, just a lot colder!

Graham