"Darren Prescott" wrote in message
...
That sounds rather similar to what happened here. At 18Z the
temperature was 27°C with a light and variable wind and a few minutes
later the wind became a rather gusty ENE'ly, about force 4, with the
temperature falling 9° in an hour.
It happened about 16:15z here in Leysdown (north Kent) - there was a
sudden gust of wind and the temperature fell sharply, 6C in the half hour
between 16 and 16:30z. There was also an appearance of some cloud,
although the sun came out again by 17z.

The hourly summaries for Southend show it well:

http://weather.noaa.gov/weather/current/EGMC.html

Interestingly, the MetO picked up on it rather well, showing the wind
veering and temperature dropping markedly between 15z and 18z for here.
GFS had a similar switch but a smaller drop in temperature.
----------------------
Same here, dropped from 27C to 17C in the hour between 17.30 and 18.30.
Suprisingly windy here this morning considering the lack of isobars but
there does seem to be some disturbances running down in the flow.

Dave, S.Essex