An upper front and jetstreak, associated with a rapid shortwave trough crossing Tasmania, helped whip up strong, hot northwesterly surface winds on Sunday, causing extreme fire dangers with active fires in central and eastern Victoria.
WeatherTheatre SceneOne Analysis captured the upper front west of Tasmania at 9-2-2014-0Z, revealed as a tropopause fold extending some two-thirds the depth of the troposphere.
WeatherTheatre SceneOne 9-2-2014-00z, Australia, Top Down View. An elongated well in the tropopause surface indicates the shortwave trough, at this time just west of Tasmania. Red shadings show the strongest winds, associated with the jetstreak.
WeatherTheatre SceneOne 9-2-2014-00z, Australia, Northerly View. In the foreground, the upper front is revealed where the tropopause (upper) surface folds into an elongated tubular sheath, enveloping an elevated 300K Theta (lower) surface. Red shadings on the tropopause indicate the strongest winds associated with the jetstreak. Blue shadings on the 300K Theta (lower) surface indicate the coldest air while red shadings the warmest air.