'Frightening, hair-raising' storm hits Bega Valley

But as her daughter's hair became static, she was reminded to get inside.

"It was around sunset time, and you could see the clear icy blue [clouds] coming from the mountains in the west," she recalled.

"It looked like nothing I'd ever seen before - it looked scary.

"The contrast was that intense, and I've seen a lot of storms, but I haven't seen anything that drastic. It really was that icy blue in colour.

"It went really still like the calm before the storm and that's when all of our hair started to rise, and that's when I thought there's something really big coming through."

On Wednesday, January 15, a severe thunderstorm hit with heavy rainfall and strong winds, causing roofs to leak, trees to fall, and minor flooding in some parts of the Far South Coast.

Although the moment held some laughter, Kristy recalled the chuckle from her teenage daughter as being filled with nerves.

Kristy said she witnessed the lightning strikes followed by immediate thunder in nearby paddocks, all while the house she was living in shook on top of a hill near Yowrie.

"I was actually concerned about being one of the highest points with not a lot of anything around us to take the [brunt] if it hit us," she said.

"It looked like there was something from the north coming in and meeting one from the west, and hit Cobargo at the same time, and I wondered what happens when two storms collide."

Meteorologist Miriam Bradbury from the Bureau of Meteorology said the reason clouds can be blue-green in colour was complicated as there was still discussion among meteorologists as to why it happened.

"The greener storm clouds are often associated with hail, particularly large hail, but the easiest way to think of it is there are three things that will determine the colour of clouds," Ms Bradbury said.

"One is the angle of the sun, the other thing is other particulates in the air like smoke and fog, but the third thing is to do with the make-up of the cloud itself, so the size, how thick it is, how dense the raindrops are and how tall that cloud is."

She said Bega received 228mm of rainfall over the past week, but said it was worth noting the vast majority happened on Friday, January 10, and the past 24 hours.

SES Local Commander John Mills said most calls they had received were from areas between Bega and Eden, most around 5.30pm to 6pm Wednesday.

"Obviously, the calls were very dramatic from the individuals concerned, and that's why we try to address them as quickly as we can, but from our perspective, it's a typical sort of event that came through," he said.