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One might consider reading books about aviation weather. Weather Flying by Robert Buck is timeless, and is good for VFR and IFR flight. All my primary and instrument students read it. I cannot remember any student complaining about having assigned reading in that book. One way is to start by looking at the PROG charts about two days in advance and ...


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The primary reason for the non-ISA conditions is, as Michael Hall stated in his answer, the sun. Local differences were also explained by Michael, I'd like to add the main contributor to global deviations from ISA: the shape of the earth. As we move further away from the equator, the radiation of the sun hits a surface that is more and more slanted in ...


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An ISA standard atmospheric day is really more like a global average. Locally and regionally, there will always be deviations from the "norm" based on the natural cycles of the sun. Overnight the temperature will cool, then the sun will rise and things will warm up again. This phenomenon also produces variations in the pressure and density over larger ...


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