A quite dramatic increase in air temperature was recorded at Bournemouth
Airport this morning. At 0300Z it was +1.3°C with a very light NW'ly, by
0330Z the wind had backed SW'ly, increased slightly and the temperature had
shot up to +9.8°C. A rise of 8.5 degrees in 30mins.

The actual sequence was :-

0300Z +1.3
0310Z +5.2
0320Z +8.4
0330Z +9.8

It had several of us thinking of an October night in 1987.

Jon.

On 26/10/2010 09:58, Jon O'Rourke wrote:
A quite dramatic increase in air temperature was recorded at
Bournemouth Airport this morning. At 0300Z it was +1.3°C with a very
light NW'ly, by 0330Z the wind had backed SW'ly, increased slightly
and the temperature had shot up to +9.8°C. A rise of 8.5 degrees in
30mins.

The actual sequence was :-

0300Z +1.3
0310Z +5.2
0320Z +8.4
0330Z +9.8

It had several of us thinking of an October night in 1987.

Jon.

The sea surface temperature in the English Channel is still well above
10C, so this is hardly surprising. A bit of local advection explains it
nicely.

I had a similar experience about 0530Z at Ashurst (about 15 miles NE of
Bournemouth), watching the numbers steadily count up on my electronic
dew point sensor.

--
- Yokel -

Yokel posts via a spam-trap account which is not read

"Yokel" wrote in message
...
On 26/10/2010 09:58, Jon O'Rourke wrote:
A quite dramatic increase in air temperature was recorded at Bournemouth
Airport this morning. At 0300Z it was +1.3°C with a very light NW'ly, by
0330Z the wind had backed SW'ly, increased slightly and the temperature
had shot up to +9.8°C. A rise of 8.5 degrees in 30mins.

The actual sequence was :-

0300Z +1.3
0310Z +5.2
0320Z +8.4
0330Z +9.8

It had several of us thinking of an October night in 1987.

Jon.

The sea surface temperature in the English Channel is still well above
10C, so this is hardly surprising. A bit of local advection explains it
nicely.


Indeed, it was only a matter of time before the strengthening gradient flow
(circa 30-40KT) coupled with the boundary layer and broke the surface
inversion
(Herstmonceux midnight ascent
http://weather.uwyo.edu/cgi-bin/soun...600&STNM=03882)
- even so a rise of over 8 degrees in the space of 30min at 0300Z is quite
unusual, IMHO.

Jon.

On Oct 26, 9:58*am, "Jon O'Rourke" wrote:
A quite dramatic increase in air temperature was recorded at Bournemouth
Airport this morning. At 0300Z it was +1.3°C with a very light NW'ly, by
0330Z the wind had backed SW'ly, increased slightly and the temperature had
shot up to +9.8°C. A rise of 8.5 degrees in 30mins.

The actual sequence was :-

0300Z +1.3
0310Z +5.2
0320Z +8.4
0330Z *+9.8

It had several of us thinking of an October night in 1987.

Jon.

It shouldn't have done, Jon. :-)
The rise in temperature here was of a similar type though much less
spectacular and occurred later. Unlike Bournemouth this place is not
sheltered from the SW and isn't a frost hollow even though the min was
-0.5°C.

Tudor Hughes, Warlingham, NE Surrey, 556 ft, 169 m