OT-CHAT: weather
- Subject: OT-CHAT: weather
- From: L* M*
- Date: Sat, 17 Mar 2001 18:00:35 -0500
Seems like one of our list physicist/meteorologist/iris fanatics
explained this several years ago. I have no idea if I remember this
correctly, but, as you & I know, frost can definitely get on plants at
night when temps are above freezing. As was already posted, water
condenses (fog, dew) when the air is saturated (dew point = air
temperature). ...and ...then.. something about the energy transfer as
vapor changes to water and water to ice/frost. So it gets colder where
the plants 'touch' the air ...see?
?
Anyway, for purposes of worrying about your plants, if the dew point is
27, at least you know it can't get any colder than that, frost or no
frost.
Donald Eaves in TX asked:
<Well, they've changed our forecast yet again. Can someone explain
'dewpoint' to me? The predicted low is 32 F, but there is a dewpoint
listed
for 27 for about five hours running.>
Linda Mann east Tennessee USA zone 7/8
my dad, with a PhD in physics from Cornell, no less, who taught for
years, is probably spinning in his grave!
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