Thick fog covered large areas of southeast Queensland and northeast NSW on Tuesday morning, including Brisbane.

The combination of clear skies, relatively low temperatures and plentiful moisture in the lower atmosphere caused an abundance of fog in eastern Australia on Monday night and Tuesday morning.

Image: The sun rises over a fog-covered Brisbane on Tuesday morning, seen from Mt Coot-Tha. Source: @russellingram804 / Instagram

Just one day after Sydney's transport networks were affect by thick fog, visibility was reduced to 100 metres in parts of Brisbane early on Tuesday.

This morning's fog was thickest to the west of Brisbane and over inland areas of northeast NSW, although westerly winds managed to carry some of it towards the coast.

May the 4th be with you has now become May the fog be with you ☺️#bnefog #StarWarsDay pic.twitter.com/gIbNlzVf6R

— Dave Andrews 🎥 🚁 📺 📻 (@chopperdaveqld) May 3, 2021

Brisbane Airport only sees about nine fog days per year on average, with a peak in fog frequency between May and July, and again in October. This makes it more fog-prone than Sydney and Adelaide, but not quite as foggy as Canberra, Melbourne or Perth.

Image: A gloomy start to Tuesday as fog shrouds Brisbane. Source: @sheisaclairebear / Instagram

The airborne moisture that helped cause this morning's fog should also fuel showers and some thunderstorms in southeast Queensland and northeast NSW this afternoon and evening.

The atmosphere will become even more unstable on Wednesday, with thunderstorms more likely and severe storms possible. Be sure to check the latest warnings over the next couple of days.