<P> The older of the models of extratropical cyclone development is known as the Norwegian cyclone model , developed during and shortly after World War I within the Bergen School of Meteorology . In this theory , cyclones develop as they move up and along a frontal boundary , eventually occluding and reaching a barotropically cold environment . It was developed completely from surface - based weather observations , including descriptions of clouds found near frontal boundaries . Developed from this model was the concept of the warm conveyor belt , which transports warm and moist air just ahead of the cold front above the surface warm front . </P>
<P> The older of the models of extratropical cyclone development is known as the Norwegian cyclone model , developed during and shortly after World War I within the Bergen School of Meteorology . In this theory , cyclones develop as they move up and along a frontal boundary , eventually occluding and reaching a barotropically cold environment . It was developed completely from surface - based weather observations , including descriptions of clouds found near frontal boundaries . Developed from this model was the concept of the warm conveyor belt , which transports warm and moist air just ahead of the cold front above the surface warm front . </P>
the development of a mid-latitude cyclone according to the norwegian model begins along the ​
the development of a mid-latitude cyclone according to the norwegian model begins along the ​
frontal boundary
frontal boundary