Chalfont St Giles - Wednesday 7th February 2007
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0630z S F1 8000 HZ SKC (maybe some Ci) -05.9/-07.1 1003
RMK: Moderate hoar frost. Coldest night of the winter so far.


Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England

Chalfont St Giles - Wednesday 7th February 2007
------------------------------------------------------------

0630z S F1 8000 HZ SKC (maybe some Ci) -05.9/-07.1 1003
RMK: Moderate hoar frost. Coldest night of the winter so far.

0900z CALM 6000 HZ 3Ci300 -04.7/-06.0 1003
RMK: Moderate hoar frost. Ground frozen hard. Such low temperatures
are uncommon here without a snow cover.
24-HR STATISTICS: Max (0900-0900z): 5.1 at 1405z
Min (0900-0900z): -6.4 at 0750z
Grass min (1500-0900z): -10.4
Rain (0900-0900z): 0.1 mm (frost)


Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England

"Norman Lynagh" wrote in
message ...
Chalfont St Giles - Wednesday 7th February 2007
0900z CALM 6000 HZ 3Ci300 -04.7/-06.0 1003
RMK: Moderate hoar frost. Ground frozen hard. Such low temperatures
are uncommon here without a snow cover.

.... similar comment would apply here Norman. Looking back at our short
record (since 2000), minima = -6°C aren't that common anyway; the
lowest value (over these few years) was -6.7°C on 1st January, 2002 and
that was NOT accompanied by a snow cover of any sort, but generally, we
need some sort of snow cover for something below -4°C to be reliably
experienced (bearing in mind these comments apply to a suburban back
garden, not a 'standard' open-field site).

Martin.

--
Martin Rowley
Bracknell

Chalfont St Giles - Wednesday 7th February 2007
------------------------------------------------------------

0630z S F1 8000 HZ SKC (maybe some Ci) -05.9/-07.1 1003
RMK: Moderate hoar frost. Coldest night of the winter so far.

0900z CALM 6000 HZ 3Ci300 -04.7/-06.0 1003
RMK: Moderate hoar frost. Ground frozen hard. Such low temperatures
are uncommon here without a snow cover.
24-HR STATISTICS: Max (0900-0900z): 5.1 at 1405z
Min (0900-0900z): -6.4 at 0750z
Grass min (1500-0900z): -10.4
Rain (0900-0900z): 0.1 mm (frost)

1500z CALM 8000 HZ 1Ac180 05.2/-06.1 1011
RMK: Ac edge far to SW. Hoar frost has persisted all day in the
shade.
I suspect that the temperature is rather lower than the
Davis VP
is indicating. With not a breath of wind and the sun shining
strongly at a low angle into the louvres I think the body of
the
instrument is being warmed and the temperature sensor is
being affected by this. No doubt the indicated temperature
will
start to plummet in about an hour or so.



Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England

Chalfont St Giles - Wednesday 7th February 2007
------------------------------------------------------------

0630z S F1 8000 HZ SKC (maybe some Ci) -05.9/-07.1 1003
RMK: Moderate hoar frost. Coldest night of the winter so far.

0900z CALM 6000 HZ 3Ci300 -04.7/-06.0 1003
RMK: Moderate hoar frost. Ground frozen hard. Such low temperatures
are uncommon here without a snow cover.
24-HR STATISTICS: Max (0900-0900z): 5.1 at 1405z
Min (0900-0900z): -6.4 at 0750z
Grass min (1500-0900z): -10.4
Rain (0900-0900z): 0.1 mm (frost)

1500z CALM 8000 HZ 1Ac180 05.2/-06.1 1011
RMK: Ac edge far to SW. Hoar frost has persisted all day in the
shade.
I suspect that the temperature is rather lower than the
Davis VP
is indicating. With not a breath of wind and the sun shining
strongly at a low angle into the louvres I think the body of
the
instrument is being warmed and the temperature sensor is
being affected by this. No doubt the indicated temperature
will
start to plummet in about an hour or so.

2100z CALM 6000 HZ 1Ac180 6Ci300 -03.0/-05.5 998
RMK Still a sky full of stars here. Ground frozen hard.



Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England