Parts of South Australia, Victoria and New South Wales woke up to dense fog on Sunday morning, with further morning fog likely in the coming days. 

Visibility plunged to 100m or below in parts of the three states. In New South Wales, the fog dropped visibility down to 500mm at Wagga Wagga and 300m at Dubbo. Some of the thickest fog was in the far south of the state, right on the border with Victoria, where there was only 100m of visibility at Corowa Airport. This thick fog lingered until 9am before beginning to burn off as the day began to warm up. 

Across the border to Victoria, the fog was even thicker, with visibility down to 50m at Kilmore Gap and Shepparton. Other notable fog around the state included 300mm at Swan Hill and 200m at Wangaratta.  

In South Australia, visibility dropped to 500m at Parafield, 400m at Mt Gambier and 100m at Edinburgh. Some of the thickest fog though impacted Adelaide Airport, with just 100m of visibility. Although not as dense, the fog at Adelaide Airport stuck around long after sunrise, with visibility of 600m at 9am. 

The fog developed thanks, in part, to a high-pressure system bringing the ideal conditions – light winds and clear skies.  These conditions allowed the temperature at the surface to drop low enough for condensation to occur, forming fog. Rain from recent fronts and troughs provided ample surface at the surface, fuelling the fog formation. 

Image: A high resides over southeast Australia on Monday morning, bringing the risk of fog. Source: ECMWF model

The high responsible will bring similar conditions on Monday morning, with fog a good chance over large parts of the southeast, including Adelaide, Melbourne and Canberra.