uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged.

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Old July 8th 18, 05:46 PM posted to uk.sci.weather
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Default Heat Low - SE England

This is the second consecutive day with an identifiable Heat Low over southern England. Yesterday's (Sat.) produced a marked westerly here which died out early evening. Today's low is somewhat less marked and there is a light N'ly but I wouldn't bet against a sea breeze from the south coast penetrating as far as here temporarily (40 miles). It does happen from time to time. Max temps on both days 31°C.
On Planet Footy these are back-to-back heat lows. Roll your own eyes - mine hurt.

Tudor Hughes, Warlingham, NE Surrey, 557 ft 170 m.

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Old July 8th 18, 06:07 PM posted to uk.sci.weather
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Default Heat Low - SE England

On 08/07/2018 17:46, Tudor Hughes wrote:
This is the second consecutive day with an identifiable Heat Low over southern England. Yesterday's (Sat.) produced a marked westerly here which died out early evening. Today's low is somewhat less marked and there is a light N'ly but I wouldn't bet against a sea breeze from the south coast penetrating as far as here temporarily (40 miles). It does happen from time to time. Max temps on both days 31°C.


Tudor, unless my ageing eyes are deceiving me, a tiny heat low formed
over Exeter this afternoon. I was looking at the satellite images and
you can detect an anti-clockwise rotation to the clump of cloud stuck
over the city.

We're right on the edge of it here and the sky all around is clear. If
it wasn't a heat low then maybe sea breezes were responsible for the
rotation?

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk
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Old July 9th 18, 04:54 PM posted to uk.sci.weather
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Default Heat Low - SE England

On Sunday, 8 July 2018 18:07:31 UTC+1, Nick Gardner wrote:
On 08/07/2018 17:46, Tudor Hughes wrote:
This is the second consecutive day with an identifiable Heat Low over southern England. Yesterday's (Sat.) produced a marked westerly here which died out early evening. Today's low is somewhat less marked and there is a light N'ly but I wouldn't bet against a sea breeze from the south coast penetrating as far as here temporarily (40 miles). It does happen from time to time. Max temps on both days 31°C.


Tudor, unless my ageing eyes are deceiving me, a tiny heat low formed
over Exeter this afternoon. I was looking at the satellite images and
you can detect an anti-clockwise rotation to the clump of cloud stuck
over the city.

We're right on the edge of it here and the sky all around is clear. If
it wasn't a heat low then maybe sea breezes were responsible for the
rotation?

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


It's happened again! See this: a href="http://www.xcweather.co.uk/GB/observations"/a

Here at the moment (4.45 pm) and for a lot of the day the wind has been variable with 7/8 Cu med and Sc cugen. Rather gloomy and still. Despite the cloud the max so far is 28.2°C.

PS - I bet your eyes aren't as aged as mine.

Tudor Hughes, Warlingham, Surrey TQ 352595
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Old July 9th 18, 05:29 PM posted to uk.sci.weather
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Default Heat Low - SE England

On Monday, July 9, 2018 at 4:54:02 PM UTC+1, Tudor Hughes wrote:
On Sunday, 8 July 2018 18:07:31 UTC+1, Nick Gardner wrote:
On 08/07/2018 17:46, Tudor Hughes wrote:
This is the second consecutive day with an identifiable Heat Low over southern England. Yesterday's (Sat.) produced a marked westerly here which died out early evening. Today's low is somewhat less marked and there is a light N'ly but I wouldn't bet against a sea breeze from the south coast penetrating as far as here temporarily (40 miles). It does happen from time to time. Max temps on both days 31°C.


Tudor, unless my ageing eyes are deceiving me, a tiny heat low formed
over Exeter this afternoon. I was looking at the satellite images and
you can detect an anti-clockwise rotation to the clump of cloud stuck
over the city.

We're right on the edge of it here and the sky all around is clear. If
it wasn't a heat low then maybe sea breezes were responsible for the
rotation?

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


It's happened again! See this: a href="http://www.xcweather.co..uk/GB/observations"/a

Here at the moment (4.45 pm) and for a lot of the day the wind has been variable with 7/8 Cu med and Sc cugen. Rather gloomy and still. Despite the cloud the max so far is 28.2°C.

PS - I bet your eyes aren't as aged as mine.

Tudor Hughes, Warlingham, Surrey TQ 352595


Certainly seems to be a heat low http://meteocentre.com/analysis/map-...r&size=lar ge

Similar sort of circulation over Devon & Cornwall. S wind over most of Devon (away from the north coast.) Quite strong & gusty N wind across Cornwall, on both offshore & onshore coasts.

Graham
Penzance
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Old July 9th 18, 09:28 PM posted to uk.sci.weather
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Default Heat Low - SE England

On Monday, 9 July 2018 17:29:06 UTC+1, Graham Easterling wrote:
On Monday, July 9, 2018 at 4:54:02 PM UTC+1, Tudor Hughes wrote:
On Sunday, 8 July 2018 18:07:31 UTC+1, Nick Gardner wrote:
On 08/07/2018 17:46, Tudor Hughes wrote:
This is the second consecutive day with an identifiable Heat Low over southern England. Yesterday's (Sat.) produced a marked westerly here which died out early evening. Today's low is somewhat less marked and there is a light N'ly but I wouldn't bet against a sea breeze from the south coast penetrating as far as here temporarily (40 miles). It does happen from time to time. Max temps on both days 31°C.

Tudor, unless my ageing eyes are deceiving me, a tiny heat low formed
over Exeter this afternoon. I was looking at the satellite images and
you can detect an anti-clockwise rotation to the clump of cloud stuck
over the city.

We're right on the edge of it here and the sky all around is clear. If
it wasn't a heat low then maybe sea breezes were responsible for the
rotation?

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


It's happened again! See this: a href="http://www.xcweather.co.uk/GB/observations"/a

Here at the moment (4.45 pm) and for a lot of the day the wind has been variable with 7/8 Cu med and Sc cugen. Rather gloomy and still. Despite the cloud the max so far is 28.2°C.

PS - I bet your eyes aren't as aged as mine.

Tudor Hughes, Warlingham, Surrey TQ 352595


Certainly seems to be a heat low http://meteocentre.com/analysis/map-...r&size=lar ge

Similar sort of circulation over Devon & Cornwall. S wind over most of Devon (away from the north coast.) Quite strong & gusty N wind across Cornwall, on both offshore & onshore coasts.

Graham
Penzance


There's been a heat low over south Wales over the past couple of afternoons and evenings. In fact, it has been occurring quite often in the past month. It's tricky to pick out as there aren't any official observations inland between Cardiff on the coast and Sennybridge and Shobdon/Hereford to the north. If you look at other sources (WOW, Wunderground) you can easily make out the relatively lower pressure. Also, observation of wind direction at my location is very revealing - with some quite marked reversals during the day. You can also pick out low level convergence by studying animations of visible satellite imagery,

--
Freddie
Ystrad
Rhondda
148m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/YstradRhonddaWx for hourly reports (no wind measurement currently)


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Old July 10th 18, 10:14 AM posted to uk.sci.weather
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Default Heat Low - SE England


There's been a heat low over south Wales over the past couple of afternoons and evenings. In fact, it has been occurring quite often in the past month. It's tricky to pick out as there aren't any official observations inland between Cardiff on the coast and Sennybridge and Shobdon/Hereford to the north. If you look at other sources (WOW, Wunderground) you can easily make out the relatively lower pressure. Also, observation of wind direction at my location is very revealing - with some quite marked reversals during the day. You can also pick out low level convergence by studying animations of visible satellite imagery,

--
Freddie
Ystrad
Rhondda
148m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/YstradRhonddaWx for hourly reports (no wind measurement currently)


The large number of AWS make it easier to prove local circulations always previously suspected.

There's a very distinct daily sea breeze pattern here, particularly under a strong 'Azores' ridge over SW England. The recent ridging has been rather too far north for the pattern to be clear - to much of a gradient E-NE wind..

The strong morning heating of the south coast quickly starts a sea breeze into Mount's Bay, always particularly strong at Marazion where there are no hills behind to impede the flow. It often results in an offshore SE between Lands End & Sennen, flowing up the valley behind Porthcurno and down Vallendreath at Sennen.

During the early afternoon the strong heating of the generally NW facing 'north' coast results quite a strong sea breeze in St Ives Bay which funnels through Hayle Saltings to Marazion marsh. At Marazion it can cause a complete reversal of the wind direction mid afternoon. The progress often marked by the normal sea breeze limit line of cloud.

The net result of all this is a circular wind flow around the Lands end peninsula. Something I always suspected, but now with my own station, the AWS at Gwennap Head (John's Lands End site), Lands End airport (near St Just) Bosullow (centre of the peninsula) & St Ives as well as Camborne, the evidence is there.

Patchy thin Sc this morning, and only 19C @ 09:00. Much more pleasant.

Graham
Penzance






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