Aviation Weather (AVMG 3050) - Exam 3 with correct answers /2025

Aviation Weather (AVMG 3050) - Exam 3 with correct answers /2025 Airmass Wind Shear - Correct Answer - Airmass wind shear occurs at night under fair weather conditions in the absence of strong fronts and/or strong surface pressure gradients. - It develops when the ground becomes cooler than the overlying airmass as a result of radiational cooling. - If the cooling is strong enough, a groundbased inversion results — in this case, temperature increases with altitude from the surface to a few hundred feet — a layer known as nocturnal inversion where you can expect wind shear. Downburst - Correct Answer - First discovered and named by Professor Tetsuya "Ted" Fujita of the University of Chicago. - Concentrated severe downdraft that includes an outward burst of damaging winds and dangerous wind shear near the ground. Horizontal Wind Shear - Correct Answer Change in wind over a horizontal distance. Low-Level Wind Shear (LLWS) - Correct Answer - Severity categories of LLWS can be expressed in terms of vertical wind shear. - An important characteristic of wind shear is that it may be associated with a thunderstorm, a low-level temperature inversion, a jet stream, or a frontal zone. - LLWS Severity/Magnitude = Light (4.0), Moderate (4.0-7.9), Strong (8.0-11.9), and Severe (=12). - During departure under conditions of suspected low-level wind shear, a sudden decrease in headwind will cause a loss in airspeed equal to the decrease in wind velocity. Low-Level Wind Shear Alert System (LLWSAS) - Correct Answer - Because of the low-level wind shear hazards of downbursts, microbursts, and gust fronts, low-level wind shear alert systems (LLWAS) have been install