Welcome to your Private Pilot – Chapter 6 Name Email The boundary between two different air masses is referred to as a frontolysis. frontogenesis. front. One of the most easily recognized discontinuities across a front is a change in temperature. an increase in cloud coverage. an increase in relative humidity. An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as an inactive frontal cloud. a funnel cloud. a lenticular cloud. During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts? Cumulus. Dissipating. Mature. Which weather phenomenon signals the beginning of the mature stage of a thunderstorm? The appearance of an anvil top. Precipitation beginning to fall. Maximum growth rate of the clouds. In which environment is aircraft structural ice most likely to have the highest accumulation rate? Cumulus clouds with below freezing temperatures. Freezing drizzle. Freezing rain. In the TAF for KMEM, what does "SHRA" stand for? Rain showers. A shift in wind direction is expected. A significant change in precipitation is possible. Every physical process of weather is accompanied by, or is the result of, a movement of air. pressure differential. heat exchange. The base and tops of the overcast layer reported by a pilot are 1,800 feet MSL and 5,500 feet MSL. 5,500 feet AGL and 7,200 feet MSL. 7,200 feet MSL and 8,900 feet MSL. What are the standard temperature and pressure values for sea level? 15 °C and 29.92 inches Hg. 59 °C and 1013.2 millibars. 59 °F and 29.92 millibars. The conditions necessary for the formation of cumulonimbus clouds are a lifting action and unstable air containing an excess of condensation nuclei. unstable, moist air. either stable or unstable air. Time's upTime is Up! 0 Private Pilot – Chapter 7 Private Pilot – Chapter 5