Land and Sea Breezes

  • Land and sea breezes are prevalent on the narrow strips along the coasts or a lake.
  • It is a diurnal (daily) cycle, in which the differential heating of land and water produces low and high pressures.
  • During the day when landmass gets heated more quickly than the adjoining sea or large lake; air expands and rises. This process produces a local low pressure area on land.
  • Sea breeze then develops, blowing from the water (high pressure) towards the land (low pressure).
  • The sea breeze begins to develop shortly before noon and generally reaches its greatest intensity during mid-day to late afternoon. These cool winds have a significant moderating influence in coastal area.
  • At night, the land and the air above it cools more quickly than the nearby water body.
  • As a result, land has high pressure while the sea has comparatively a low pressure area.
  • Gentle wind begins to blow from land (high pressure) towards sea (low pressure). This is known as land breeze (see fig.)