The 'eye' of the cyclone has abnormally high temperature and the lowest pressure. In case of a cyclone, 'eye' is the place where all the winds coming inside in a spiral motion converge. The eye is surrounded by the 'eyewall', the roughly circular ring of deep convection, which is the area of the highest surface winds in the tropical cyclone. The eye is composed of air that is slowly sinking and the eyewall has a net upward flow as a result of many moderate – occasionally strong – updrafts and downdrafts. In strong tropical cyclones, the eye is characterised by light winds and clear skies, surrounded on all sides by a towering, symmetrical eyewall. In weaker tropical cyclones, the eye is less well defined and can be covered by the central dense overcast, an area of high, thick clouds. In all storms, the eye is the location of the storm's minimum barometric pressure – where the atmospheric pressure at the sea level is the lowest.