Canberra's second-highest day of rainfall this year so far
Canberra is undergoing its biggest spray since February, making Thursday morning's rainfall the second-highest this year.
Bureau of Meteorology data shows Canberra has seen over 40 millimetres of rain since midnight, falling short of February 26th's deluge of about 66mm which saw widespread flooding in the capital.
The bureau is predicting a possibly severe thunderstorm on Thursday, expecting up to 60mm on Thursday, with more rain forecast for Friday.
The bureau released a map online on Thursday morning which showed the Canberra region was likely to see severe storms.
Bureau meteorologist Anita Pyne said thunderstorms over Canberra were likely to form in the afternoon which could see downpours as people start commuting home.
"Thunderstorms can drop a large amount of precipitation in a short amount of time," Ms Pyne said.
"There's a lot of rain around on the Canberra radar at the moment."
The bureau had not yet issued warnings for the capital but had been liaising with local emergency services.
Conditions were set to ease slightly from Friday throughout the weekend before becoming mostly sunny on Sunday and early next week.
East of Canberra, at the South Coast, seas of up to two metres were being recorded as southbound winds brought in rain.
However, conditions at the coast were expected to ease as Canberra's did, with mostly sunny conditions forecast for Sunday.
The mountains to Canberra's south, including those in Kosciuszko National Park, were likely to see storms on Thursday.
"Mountains are very good at triggering thunderstorms," Ms Pyne said.
"They can get winds going into the mountains that have nowhere to go but up."
More to come