Weather and pressure (density vs true altitude), Cloud base, freezing level, DALR, SALR, Surface heating
How to calculate Pressure Altitude Ref: https://www.youtube.com/watch?v=KcisGhtIigE Pressure Altitude definition: The height above the standard datum plane. (Sea level, 15 degrees, 29.92 in mercury, 1.98 degrees per 1000 ft, 14.7) Pressure Altitude Method 1: Set altimeter to 29.92 and read pressure Pressure altitude Method 2: ((29.92 - altimeter setting) * 1000) add this to: Field elevation if you're trying to get PA on ground Flight elevation (set to altimeter setting?) if you're trying to get PA in air Pressure altitude Method 3: (no need to memorize) hAlt = (1-(pSta/1013.25)^0.190284) x 145366.45 True altitude: Setting the altimeter to altimeter setting approximates True altitude (actual altitude above sea level) Trough: a line that juts out from a low pressure area Ridge: Similar to trough but on a high pressure area, typically nice weather Col: area between two low and two high pressure areas creating unstable weather. Fog in win...