The phenomena that you saw is called an temperature inversion. Usually temperatures decrease as you move from the ground; in this case they do not. You can sometimes see smog or smoke in a valley rising up to a certain elevation and then mixing laterally. It will not penetrate this boundary layer. Usually early morning breezes, caused by heating of the earth's surface by the sun, will perforate this boundary layer and allow for mixing of the air masses.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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