Aviation Weather Questions and Answers Already Passed

Aviation Weather Questions and Answers Already Passed What are the characteristics of the flow of air around high pressure systems? Outward Downward Clockwise What are the characteristics of the flow of air around low pressure systems? Inward Upward Counterclockwise What is a Trough Line? An elongated area of low pressure. (Air rises in this area) (It is conducive to cloudiness and precipitation) What is a Ridge Line? 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? 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? 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? Coriolis Force What causes surface winds to generally flow across the isobars at an angle? Surface Friction What is the effect of stable air on clouds? Stratiform What is the effect of unstable air on clouds? Cumuliform What is the effect of stable air on turbulence? Smooth What is the effect of unstable air on turbulence? Rough What is the effect of stable air on precipitation?