What conditions favour the formation of radiation fog at sea?

A. Heavy rain lowering visibility at a warm front

B. High pressure and strong sunshine — fog forms in the afternoon

C. Strong winds mixing warm and cold air masses at a front

D. Clear skies overnight (rapid surface cooling), light winds, and moist air — warm moist air from land carried over colder water

A. 17–21 knots; fresh breeze; moderate waves, many white horses

B. 28–33 knots; near gale; sea heaps up, streaks of foam

C. 22–27 knots; strong breeze; large waves begin to form, white foam crests extensive

D. 34–40 knots; gale; moderately high waves of greater length

A. Cumulus builds → heavy showers → rapid clearance → cold and clear

B. Fog → drizzle → clearing → cold front

C. Cirrus cloud → thickening alto/stratus → steady rain → clearing → warmer, humid, possibly foggy conditions in the warm sector

D. Wind backs sharply, brief squall, then long clear period

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