Atmospheric Circulation and Weather Systems

Hadley, Ferrel, and Polar cells

These three cells describe the primary global atmospheric circulation patterns: Hadley (tropical), Ferrel (mid-latitude), and Polar cells.

Sea surface temperature above 27°C

Tropical cyclones require warm ocean surfaces (above 27°C) to generate the energy needed for storm development.

Calm region at the center with subsiding air

The eye of a tropical cyclone is a peaceful, calm area at the storm's center where air descends, surrounded by the intense eye wall.

Different heating and cooling rates of land and sea

Land heats and cools faster than water, creating pressure gradients that cause daily wind pattern reversals between land and sea.