"Paul Hyett" wrote in message
...
What is the mechanism by which the temperature *rises* when clouds come
over on otherwise clear nights*?

Common sense suggests that the most they could do would be to halt the
drop in temperature. After all, a rise in temperature *should* require a
heat source, and those are absent at night.

A heat source is ceratinly not absent at night.What is the soil temerature
at, say, 10 cm?