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Index of Subjects Hi Paul I remember reading somewhere that the reason was that the sun would hit the top of the hills first, drawing heat upwards (convection?), that would then draw the colder air down the slopes to the hollows.. can't remember where I saw that, but it seems to make sense (from the point of physics of air mass movement) Andrew S________________________________________ From: naturens-owner@chebucto.ns.ca [naturens-owner@chebucto.ns.ca] on behalf of rita.paul@ns.sympatico.ca [rita.paul@ns.sympatico.ca] Sent: October-09-15 9:31 AM To: naturens@chebucto.ns.ca Subject: [NatureNS] Frost in the morning Hi All In the old days on the farm we would be out before the Sun in early October. Not so much anymore! Then we would notice that the white frost would form just as the sun broke the horizon on a morning like this. This morning that happened also. When I went out before sun up there was no white frost anywhere but half an hour latter everything was white. I assume it was enough to kill tender plants but we need wait and see. There used to be an explanation for that but I forget - I was never sure if it was correct or not! Perhaps someone will remember. Enjoy the beautiful day Paul
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