On Apr 29, 1:36 pm, (Citizen Bob) wrote:
On Sun, 29 Apr 2007 09:30:37 +0100, "Bernard Burton"

wrote:
No, I mean the ground temperature. The ground surface temperature reacts
quickest to the cloud cover, as there is usually a flux of heat from deeper
in the ground towards the surface. The ground surface temperature under
clear skies will fall rapidly until the heat loss by radiation is balanced
by the heat flux from lower in the ground (ignoring latent heat). The whole
ground temperature structure and air temperature structure will eventually
reach equilibrium in which the sum of all the heat losses is balanced by the
gains, provided that the external conditions (eg cloud cover, wind speed,
incoming radiation (from sun)), remain constant.

What Paul is talking about is the possibility that the temp rises when
the clouds come over. If all that happens is cloud cover, with no
other effects present, then the mere presence of cloud cover cannot
cause the temperature to rise.

But it does. That is the whole point of this thread.

Tudor Hughes, Warlingham, Surrey.