Fog shrouded parts of five states and territories this morning, covering areas stretching from eastern Queensland to northern Tasmania. The foggy start resulted from a combination of elevated humidity and sufficient overnight cooling, a set up not seen over such a large area for months. Widespread rain across eastern Australia during the past week has left behind an abundance of moisture near the surface, providing plenty of fuel for fog. The drop in temperatures needed for this fog to develop was made possible by mostly clear skies and light winds last night. Canberra Airport was one of the more severely affected places this morning, with visibility reduced to 50 metres at 8am and still 500 metres by 9:30am. In Tasmania, visibility dropped to 200m at Lake St Clair and 300 metres at Strahan. Across Bass Strait, the fog-prone Kilmore Gap saw some of the thickest fog as visibility dropped to less than 50 metres, and as low as 50 metres at Mount Hotham and 100 metres in Portland. Across the border into NSW, Dubbo Airport and Katoomba went as low as 50 and 100 metres respectively. The greyness spread north into QLD, where Archerfield Airport and Ipswich in the southeast, Biloela on the Capricornia Coast and Proserpine on the Central Coast were all affected. These locations all experienced visibility below 250 metres, reaching as low as 50 metres at Archerfield. The foggy morning represents a seasonal change, as eastern Australia gradually moves away from the warmer summer months towards winter. The overnight cooling that will become more prominent as we move further into autumn are a key component for the development of fog. Sunday morning will be another foggy one for a similar area of the country, although into next week the fog-prone areas will become less widespread. By Monday and Tuesday morning the morning fog will contract into an area broadly confined to eastern VIC to southeast QLD.