Re: [WR] Cold Langtoft
"David Mitchell" <david@xxxxxxxxxxxx> wrote in message
news:44cls6F1iibdU1@xxxxxxxxxxxxxxxxx
> Temp fell below 0c just before midnight, but was stable until 0440 then fell
> continuously until the min of -2.9 at 1540. Currently stands at -1.8.
> The Wolds are shrouded in hill fog with rime on the highest hills this
> morning, but this had lowered to 500 feet by evening.
> Can anyone give me an explanation about today's cold please?
>
> --
> David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire.
>
>
OK here we go!
Due to the low cloud top and fairly thin cloud and time of year (low sun angle)
the short wave radiation from the sun could not overcome the longwave radiation
from the cloud top, hence the cloud top cools. Weak convective overturning
within the cloud eventually cools the cloud base as heat is re-distributed from
base to top and then out into space and possibly giving light drizzle or snow
grains (as in Leeds). Cooling the cloud base chills the air as longwave
radiative fluxes from cloud base to ground decrease. (Cloud acts as less of a
blanket).
Isn't physics wonderful!
Will.
--
" Ah yet another day to enjoy "
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A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet).
mailto: will@xxxxxxxxxxxxxxxxxxxx
www: www.lyneside.demon.co.uk/Haytor/automatic/Current_Vantage_Pro.htm
DISCLAIMER - All views and opinions expressed by myself are personal
and do not necessarily represent those of my employer.
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Relevant Pages
- Re: Why is it so cold?
... there having been a full cover of St with no radiation and the ... Due to the low cloud top and fairly thin cloud and time of year (low sun ... hence the cloud top cools. ... Cooling the cloud base chills the air as longwave ...
(uk.sci.weather) - Re: [WR] Cold Langtoft
... >> David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire. ... > Due to the low cloud top and fairly thin cloud and time of year (low sun ... > the short wave radiation from the sun could not overcome the longwave ... Cooling the cloud base chills the air as longwave ...
(uk.sci.weather) - Re: [WR] Cold Langtoft
... >> Due to the low cloud top and fairly thin cloud and time of year (low sun ... >> the short wave radiation from the sun could not overcome the longwave ... Cooling the cloud base chills the air as longwave ... out the steep inversions critical for thin low cloud formation. ...
(uk.sci.weather) - Re: [WR] Cold Langtoft
... > "David Mitchell" wrote in message ... > Due to the low cloud top and fairly thin cloud and time of year (low ... > the longwave radiation from the cloud top, ... Cooling the cloud base chills the air as longwave radiative ...
(uk.sci.weather) - Re: [WR] Cold Langtoft
... > Due to the low cloud top and fairly thin cloud and time of year (low sun angle) ... > the short wave radiation from the sun could not overcome the longwave radiation ... Cooling the cloud base chills the air as longwave ...
(uk.sci.weather) |
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