That reminds me of my first thunderstorm i experienced in Texas: I was driving from Houston to Fort Worth when i saw a similar looking cloud-wall rolling through the sky towards me, somewhere around Waco. Then it started to rain so hard that i could not see the end of my own car in the outside mirrors and i decided to leave the highway at the next exit and wait it out. Found a little bridge on a county road and stopped under it, just before hail-stones, the size of baseballs started to fall from the ground.
I later learned from my concerned colleagues that this storm sparked several tornados…
Do you have tornados in Australia with those super-cells?
Glad you got spared this time.