I recorded a low of 4.4c last night between 02.00 - 03.00
yet Volmet S was giving for locations within 100 miles
temps between 9 to 13c at same time .Anybody confirm/
explain this diff' (sky was clear)

cheers JRM

wrote in message ...
| I recorded a low of 4.4c last night between 02.00 - 03.00
| yet Volmet S was giving for locations within 100 miles
| temps between 9 to 13c at same time .Anybody confirm/
| explain this diff' (sky was clear)

Hi John,

If you are in a slight hollow or valley and winds were calm it seems about right.
A situation occurs where a low level nocturnal inversion makes places around
you, who are at slightly higher altitudes, warmer.

Gatwick, at 196ft asl, last night went down to 7C, whereas Luton, at 526ft asl,
only went down to 11C. The 00z sounding from 03882 Herstmonceux shows
the very low level inversion being formed, bearing in mind at 05z-06z it would
be more pronounced -

http://makeashorterlink.com/?E273165C5

Here is the 06z 03743 Larkhill ascent showing 8.2C at 133m and 13.0C at 257m.
After this time insolation would warm the inversion out.

http://makeashorterlink.com/?C1A3345C5

HTH Joe

--
Wymeswold, NW Leicestershire, 83m asl
52° 48.47' North 1° 6.61' West
OS Grid - SK 59972 23779

wrote in message
...
I recorded a low of 4.4c last night between 02.00 - 03.00
yet Volmet S was giving for locations within 100 miles
temps between 9 to 13c at same time .Anybody confirm/
explain this diff' (sky was clear)

cheers JRM

A lot of pockets of cloud around, stuck under one all night in Bedford, kept
my min at 13.5!

joe.

Thanks Joe + Joe
On Tue, 2 Sep 2003 11:55:55 +0100, "Joe Hunt"
wrote:


wrote in message ...
| I recorded a low of 4.4c last night between 02.00 - 03.00
| yet Volmet S was giving for locations within 100 miles
| temps between 9 to 13c at same time .Anybody confirm/
| explain this diff' (sky was clear)

Hi John,

If you are in a slight hollow or valley and winds were calm it seems about right.
A situation occurs where a low level nocturnal inversion makes places around
you, who are at slightly higher altitudes, warmer.

Gatwick, at 196ft asl, last night went down to 7C, whereas Luton, at 526ft asl,
only went down to 11C. The 00z sounding from 03882 Herstmonceux shows
the very low level inversion being formed, bearing in mind at 05z-06z it would
be more pronounced -

http://makeashorterlink.com/?E273165C5

Here is the 06z 03743 Larkhill ascent showing 8.2C at 133m and 13.0C at 257m.
After this time insolation would warm the inversion out.

http://makeashorterlink.com/?C1A3345C5

HTH Joe

Yes John in the valleys it was chilly and the Chipstead Valley in Surrey,
went down to 3.8C.

Ian Currie-Coulsdon and Chipstead Valley
www.frostedearth.com

"Joe Hunt" wrote in message
...

wrote in message
...
| I recorded a low of 4.4c last night between 02.00 - 03.00
| yet Volmet S was giving for locations within 100 miles
| temps between 9 to 13c at same time .Anybody confirm/
| explain this diff' (sky was clear)

Hi John,

If you are in a slight hollow or valley and winds were calm it seems about
right.
A situation occurs where a low level nocturnal inversion makes places
around
you, who are at slightly higher altitudes, warmer.

Gatwick, at 196ft asl, last night went down to 7C, whereas Luton, at 526ft
asl,
only went down to 11C. The 00z sounding from 03882 Herstmonceux shows
the very low level inversion being formed, bearing in mind at 05z-06z it
would
be more pronounced -

http://makeashorterlink.com/?E273165C5

Here is the 06z 03743 Larkhill ascent showing 8.2C at 133m and 13.0C at
257m.
After this time insolation would warm the inversion out.

http://makeashorterlink.com/?C1A3345C5

HTH Joe

--
Wymeswold, NW Leicestershire, 83m asl
52° 48.47' North 1° 6.61' West
OS Grid - SK 59972 23779

On Tue, 02 Sep 2003 11:27:22 +0100, wrote:

I recorded a low of 4.4c last night between 02.00 - 03.00
yet Volmet S was giving for locations within 100 miles
temps between 9 to 13c at same time .Anybody confirm/
explain this diff' (sky was clear)

Southampton Airport reported 6 degrees in their first METARS of the
day 0450 and 0520 GMT (around 6 am BST, with scattered or no cloud and
calm). At that time, Solent MRSC on the coast reported "10, cloudy"
but the minimum was 8.2, with "8" reported at 5 am with a light
Northerly and partly coudy, clear before that (MetO site doesn't say
if BST or GMT).

With a minimum almost certainly below 6 degrees at Southampton A/P,
your 4.2 further inland, in clear calm-ish conditions, sounds quite
feasible.

--
Dave
Fareham (West)