REVEALED: What's special about fog in Toowoomba
UNIQUE circumstances go together to help make Toowoomba one of the foggiest places in Queensland.
Fog has shrouded the Garden City this morning, something not unusual for the region.
That's because there are two types of reasons why fog forms, and both can affect Toowoomba.
One of the main reasons is Toowoomba's altitude, according to meteorologist Gordon Banks.
Sitting atop the Range at 691m above sea level, low cloud often sits at ground level, making the city foggy.
Moist air comes up over the escarpment and turns into cloud.
That's when you get a lot of cloud on the ground, known as fog.
But Mr Banks said there was a second type of fog that also affects Toowoomba and it requires the perfect set of circumstances.
Radiation fog forms after a cool night when the ground itself is very cold.
You need moisture by the surface and just the right amount of freeze. Not enough to mix up the moisture otherwise the fog will dissipate.
If there's no breeze you end up with a moist layer close to the ground.
A breeze of about 5 to 10kmh is optimal for fog to form.
When there is fog in Toowoomba it often travels to the west and because Oakey and Wellcamp are lower it often ends up being low cloud rather than fog.