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301 - SPL - The gliding weather report states environmental instability. In the morning, dew covers grass and no thermals are presently active. What development can be expected for thermal activity?

Question 301 - Meteorology - SPL - Sailplane Pilot License

Formation of dew prevents all thermal activity during the following day
With ongoing insolation and ground warming, thermal lifting is likely to begin
Environmental instability prevents air from being lifted and no thermals will be generated
After sunset and formation of a ground-level inversion thermal activity is likely to begin

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