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552 - ATPL - Assuming that an initial 'trigger' force is present, the conditions most likely to result in the formation of thunderstorms are

Question 552 - Meteorology - ATPL - Airline Transport Pilot license

High surface temperature, low dew point and high dry adiabatic lapse rate
Rapid orographic cooling of cloud containing ice crystals
High relative humidity and instability throughout a deep layer
Intense surface heating, anticyclonic pressure system and relatively high freezing level

Training tests and timed exam simulations ATPL - Airline Transport Pilot license