Without a doubt, one of the most important concepts a pilot needs to understand to make sense of air movement aloft is the "Pressure Gradient Force." This concept is so essential to comprehend that, if you grasp it, you can readily make sense of how the high altitude and low level jet streams form as well as how air masses move at higher altitudes. This is one of those fundamental concepts that's worth studying carefully. Here's a new learning block that Rod just added to his "Understanding Weather eLearning Course" found on his website at: https://rodmachado.com/products/understanding-weather
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