Features October 2018 Issue
Weather Rules of Thumb
Forget the TAFs and the models. Apply a few basic rules of thumb and you’ve got your forecast covered for all but the more extreme or unusual conditions.
All of these have different scales, ranging from hours and a few miles with the mountain breeze to thousands of miles and days to weeks with trade winds. Knowing which circulation normally affects your weather and which is dominant at the moment is what I would call one of the secrets to understanding the forecast. If the wind direction is normally 150 degrees on September afternoons, seeing 120 degrees tells you the wind is driven by something different.