A motorist ploughing through rainwater at Bundaberg.
A motorist ploughing through rainwater at Bundaberg.

Heaviest August rain on record

MANY Queenslanders have been experiencing their heaviest August rain on record as widespread 50 to 100 millimetres leads to flooding, according to weatherzone.com.au.   

Since early Tuesday widespread 50 to 100mm has affected a huge area of many thousands of kilometres, from the NSW border to Townsville and inland, past Emerald.   

The Southeast Coast has been one of the wettest areas in the state.

Brisbane has had its highest 24-hour August total in 123 years and its heaviest rain since February.

Since 9am Tuesday about 78mm has fallen in the city, making this the wettest 24-hour period in August since 1887. In August that year 220mm fell in a two-day deluge including a record 124mm in a day.   

In the last 24 hours the heaviest rain in the area has been south of the city, where Archerfield broke an August record, gaining 83mm. Its previous August record was 67mm, set in 1966.   

Falls in excess of 100mm have been recorded in Burbank, Rochedale, Mt Cotton and Carbrook.   

Southeast Queensland dams have done very well too with about 50 to 100mm since it started raining early Tuesday morning.   

Flooding has also been occurring in the Sunshine Coast, Wide Bay and Burnett, Capricornia, Central Coast, Herbert and Lower Burdekin and Central Highlands and Coalfields.   

Bundaberg in the Wide Bay area exceeded 100mm since 9am Tuesday, a two-year high and a 54-year August record. The previous wettest August day was 73mm in 1988.   

Further north in the Central Coast, Mackay amassed more than 90mmm, a 12-year high for August and within 10mm of the record. This comes after a record warm August day of 29 degrees.   

On the Central Highlands, Emerald gained about 50mm, a 17-year high for August and within a few millimetres of the record.   

"This sort of rain is more typical of late summer when moisture levels are highest," weatherzone meteorologist Brett Dutschke said.   

"What we have at the moment is north-northeasterly winds blowing moisture off relatively warm Coral Sea. And we also have an active low pressure trough crossing from the west. Combine all of this and you get unusually heavy rain and flooding, Dutschke said."   

"The good news, rain is now clearing off the east coast with the movement of the trough and the flood risk is easing, just in time for Brisbane's Exhibition Holiday. But it will take a few more hours until the cloud clears. This afternoon is looking quite sunny."   

"The not so good news, it's going to get windy later today. It may even get windy enough to bring down trees, given that the recent rain has softened the ground and loosened roots."   

"Thursday will be the windiest day as dry, gusty westerlies approach 90km/h in the southeast."

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