Posted November 4, 2007
This weekend a warm high pressure air mass has been downsloping the mountains into the Denver area. This creates warm temperatures and very dry air. The air is warm because it is fairly warm to begin with, plus when it downslopes the mountains it warms even more due to adiabatic warming. When air sinks it also dries. In dry air the dewpoint and temperature will be spread far apart. The image below shows the weather conditions across Colorado on Sunday November 4th. I drew in a few mountains for fun :) Notice the warm temperatures in eastern Colorado and the very low dewpoints (in fact, single digit dewpoints). What dryness!