On Thu, 2 Oct 2003 06:43:41 +0100, Vidcapper in
wrote:

Very much the former, as plant tops can "see" the sky whereas that in the
screen cannot. A similar process occurs at the top of a forest canopy and
at the tops of clouds at night, thus leading them to become less stable at
that height.

If the lower temperature is more typical of what plants experience, and
will be damaged by, then surely gardeners might be mislead into leaving
their delicate plants unprotected, when they should be covering them up?

I agree, if all they are going by is the forecast minimum "air"
temperature. A forecast of a "ground" (now seemingly called a grass frost)
is a better indicator.
I well recall one 28th June, many years ago, just before graduation here.
The flower beds were looking good and one in particular had just been
planted with marigolds. A clear night soon followed the planting and
whilst the air temp stayed above zero, the grass minimum was well below.
Result next morning - every plant was black.

--
Mike posted to uk.sci.weather 02/10/2003 17:54:57 UTC
Coleraine
Seeking information about the Internet and the way it works? - Subscribe to
news:uk.net.beginners