Re: OT-CHAT: weather
- Subject: Re: OT-CHAT: weather
- From: L* M*
- Date: Sat, 17 Mar 2001 18:15:32 -0500
That was embarrassing enough that I went to the web:
<http://www.msue.msu.edu/ipm/CAT98_fruit/F04-28-98.htm>
"Use of dewpoint in determining frost potential"
<From past experience, you may have noticed that the minimum temperature
during one of these events [the most common spring frost scenario:
clear, calm conditions with cold air drainage and vertical temperature
stratification] commonly remains a few degrees above the dewpoint
temperature. This is probably because the air temperature is taken at 5
feet above the surface, and under these calm, clear conditions, it is
warmer than the temperature at or near the surface, which is
relatively cooler and has reached the dewpoint.>
In other words, temps probably do equal dewpoint at the boundary layer
between the plant surface and the air, but 'regular' air temps are
slightly warmer and <may> be above freezing, while boundary layer temps
<may> be below freezing.
Linda Mann east Tennessee USA zone 7/8
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