In a coastal region, a UAS pilot should expect a breeze to commence when?

In a coastal region, a UAS pilot should expect a breeze to commence when?

• A. Several hours before sunrise
• B. Immediately at sunrise
• C. Several hours after sunset
• D. Several hours after sunrise

Answer: (D)

In coastal areas a sea breeze develops as daytime heating makes the land rise warmer and air over the land rise, creating a low pressure near the coast. The cooler air over the sea moves toward the shore at the surface to replace that rising air, forming an onshore flow. This breeze doesn’t start right at sunrise; it builds as the land heats up, so you typically see the breeze several hours after sunrise, with stronger onshore flow developing into the late morning and afternoon. For UAS pilots, that means winds from sea toward land are more likely to appear a few hours after sunrise, so plan takeoffs, flights, and landings with that timing in mind and be prepared for gusts as the breeze strengthens.

In coastal areas a sea breeze develops as daytime heating makes the land rise warmer and air over the land rise, creating a low pressure near the coast. The cooler air over the sea moves toward the shore at the surface to replace that rising air, forming an onshore flow. This breeze doesn’t start right at sunrise; it builds as the land heats up, so you typically see the breeze several hours after sunrise, with stronger onshore flow developing into the late morning and afternoon. For UAS pilots, that means winds from sea toward land are more likely to appear a few hours after sunrise, so plan takeoffs, flights, and landings with that timing in mind and be prepared for gusts as the breeze strengthens.