Aviation Weather Exam Studyguide 2023
What are the characteristics of the flow of air around high pressure systems? - ANSWER Outward Downward Clockwise What are the characteristics of the flow of air around low pressure systems? - ANSWER Inward Upward Counterclockwise What is a Trough Line? - ANSWER An elongated area of low pressure. (Air rises in this area) (It is conducive to cloudiness and precipitation) What is a Ridge Line? - ANSWER An elongated area of high pressure. (Air moving out of a high depletes the quantity of air - therefore these are areas of descending air.) (Descending air favors dissipation of cloudiness) What are isobars? - ANSWER Lines on a weather chart which connect areas of equal or constant barometric pressure. If isobars are close together on a weather chart or a constant pressure chart what does this mean? - ANSWER This shows the steepness of the pressure gradient. • Close = Steep Pressure Gradient = High Wind Speeds • Spaced Out = Shallow PG = Low Wind Speeds What causes the winds aloft to flow parallel to the isobars? - ANSWER Coriolis Force What causes surface winds to generally flow across the isobars at an angle? - ANSWER Surface Friction
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