Yeti wrote:Day Hiker wrote:Cold? Where do you see cold?
Cold is a relative term, in this case it relates to air and water.
Yes, "cold" is a relative term, but a dewpoint in the 60s would NEVER BE considered "low humidity" in terms of what one would experience in the desert, which is relevant to the original question in this thread.
Yeti wrote:So, when "relatively hot" air passes over a "relatively cold" surface, what happens to it's moisture content?
If the dewpoint of the air is
lower than the temperature of the surface,
absolutely nothing happens to the moisture content. If the surface happens to be water, the moisture content will be increased.
If the dewpoint of the air is
higher than the temperature of the surface, moisture will condense on that surface (or the air would cool and moisture would condense into fog or precipitate out), and the dewpoint will be lowered, but in no case can it possibly be lowered below the temperature of the surface.
Yeti wrote:Now, imagine the dewpoint in the lower 40s... wait that's not imaginary, that's average.
I would like to see any source that shows that the AVERAGE dewpoint over central-western Lake Huron is in the lower 40s IN AUGUST, the most-humid month of the year. That's pure comedy.