An extremely abrupt cold front experienced on the coast of New South Wales, often accompanied by a dramatic roll cloud (see arcus). A warm northerly flow suddenly veers to become a much colder, gale- or near-gale-force southerly. The southern end of the Great Dividing Range blocks the progress of a normal cold front from the south-west. Various factors then combine to create an intensified flow of cold air up the east coast. Often mistakenly called a southerly ‘burster’.
Subjects: Meteorology and Climatology.