Martin Rowley wrote:
"Ken Cook" wrote in message
oups.com...
Hi, All,

Sudden gust around to around 40mph 1415Z yesterday. It lasted 15
seconds only. 2 okta Sc with small vertical development and a steady
340 degrees before, during and after as the graphs show. It was so
brief that it hardly affected the mean speed (blue line). Any views
would be appreciated.

... have experienced similar on one occasion many years ago at
Finningley (village) in a similar situation. Unstable airflow but
limited cloud development (air mass too dry) - strong surface heating,
generally moderate wind from a roughly northerly point: setting up the
tables for a fete in the early afternoon and a dust devil developed over
the airfield and drifted across the village, turning over several tables
and ripping many covers etc., to pieces. Once the DD had gone, the wind
dropped back to a more normal state, and it was as if nothing had
happened - apart from the devastation around!

I would go for a dust devil (which might not be betrayed by dust of
course if it formed over a surface that had little or no loose debris.)

Any record of frost before them?

I am trying to compile a link with the occurrence of frost or/and msty
weather to Hurricanes in the N Atlantic. Any other oddities add more
fuel to the fire. I wonder what the co-incidence of frosts might be
with the occurrence of tornadoes.