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Land breeze, a local wind system characterized by a flow from land to water late at night. Land breezes alternate with sea breezes along coastlines adjacent to large bodies of water. Both are induced by differences that occur between the heating or cooling of the water surface and the adjacent land surface. The land breeze is typically shallower than the sea breeze since the cooling of the atmosphere over land is confined to a shallower layer at night than the heating of the air during the day. Since the surface flow of the land breeze terminates over water, a region of low-level air convergence is produced.
The result is that a higher pressure is maintained. With a high pressure above the water and a lower pressure above the land, conditions are perfect for a small breeze to develop. Wind blows from the sea towards the land along the pressure gradient in an attempt to equalize pressure. This is known as a sea breeze. In the night, land cools down much quicker than does the waters of the ocean. As the land becomes cooler, so does the air above it. This results in air becoming more dense, forming a high pressure, causing winds to blow outward towards the sea. This is known as a land breeze. Thus, in the day we often see sea breezes, while in the evening we see land breezes in coastal regions.