Domanda 162, Meteorology - ATPL - Airline Transport Pilot license

Extensive isothermal layer, ice particles and water droplets must exist just below the freezing level and orographic lifting.
Environmental lapse rate less than saturated adiabatic lapse rate with dew point below 0 °C and considerable surface heating.
Environmental lapse rate greater than saturated adiabatic lapse rate through a great vertical extent, high relative humidity and an initial lifting process.
Environmental lapse rate less than dry adiabatic lapse rate with freezing level below the cloud base, high relative humidity and strong surface winds.