FAA Private Pilot Airplane (PAR)Weather Theory and ServicesMedium
At a coastal airport on a sunny afternoon, a pilot notices the surface wind consistently blowing from the ocean toward the land. What atmospheric process most directly explains this wind pattern?
- AThe land surface heats faster than the water, causing rising air over land and a pressure gradient that draws air in from the sea
- BThe water surface heats faster than the land, causing air to rise over the water
- CNocturnal radiational cooling over land is drawing in maritime air
- DA cold front is approaching from offshore, pushing air onshore
Show answer & explanationAnswer & explanation
Correct answer: A. The land surface heats faster than the water, causing rising air over land and a pressure gradient that draws air in from the sea
During the day, land heats up faster than water due to its lower specific heat, causing air over land to warm, expand, and rise, creating lower surface pressure over land. Cooler, denser air over the water flows inland to replace it, producing the afternoon sea breeze.
Why the other options are wrong
- B. Water heats more slowly than land, not faster, ruling this out.
- C. Nocturnal cooling explains the opposite, nighttime land breeze, not a daytime sea breeze.
- D. A sea breeze is a local diurnal effect, not caused by an approaching front.
Sea Breeze
A local wind that blows from sea to land during the day, caused by land heating faster than water, creating a pressure gradient that draws cooler marine air onshore.
- Occurs typically in the afternoon when land-sea temperature difference peaks
- Reverses at night as a land breeze once land cools faster than water
- Caused by differential heating due to water's higher specific heat
Memory trick: 'Land Heats, Sea Breeze Cheats' — hot land pulls in cool sea air by day.