extra-tropical cyclones

extra-tropical cyclones

Cyclones occurring in mid latitudes. A cyclone is a severe weather system with low central pressure. In the fully matured stage, it develops an eye at the center where there is no weather and calm prevails. The eye is surrounded by an inner circle of intense winds and a rotating cloud mass. Around the inner circle is the outer circle with less fierce weather. The diameter of a cyclone can extend up to 300 miles (500 km). See also cyclone.