ATPL Meteorology Practice Questions - Airline Transport Pilot Licence Meteorology Exam

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During the transition periods between the Southwest and Northeast monsoons (inter-monsoon periods) in Sri Lanka, what is the primary meteorological feature causing widespread afternoon thunderstorms?

The passage of the Intertropical Convergence Zone (ITCZ) directly over the island, combined with strong diurnal insolation and sea breeze convergence. The development of strong mid-tropospheric westerly jet streams that trigger mountain wave turbulence. The presence of a persistent Siberian high-pressure system that pushes dry cold fronts across the Indian Ocean. The cooling of the sea surface temperature surrounding Sri Lanka below 20 degrees Celsius, initiating coastal radiation fog.

Correct Answer:

The passage of the Intertropical Convergence Zone (ITCZ) directly over the island, combined with strong diurnal insolation and sea breeze convergence.

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