A weird cycle of delayed autumn storms in southeast Queensland is delivering heavy downpours, and could trigger a potentially large hail.
A band of heavy storms battered the region last Tuesday night as 51mm of rainfall soaked Forestdale in Logan in just 30 minutes.
According to the Bureau of Meteorology (BoM), the gauge in Brisbane city reached 18mm overnight while Boonah and Esk situated west of the city are almost hitting their 50mm marks in just 24 hours.
The soggy weather lingered on into Wednesday morning and is set to continue through to evening.
“We’re expecting more storms through, especially this morning and maybe into early this afternoon as well for Brisbane, and spreading out a little bit towards the Sunshine Coast and the Gold Coast,” said James Thompson, a forecaster at the weather bureau.
“It’s a cold front that’s moving through today, taking a little while to move through.
“For a few hours, we’re expecting that weather to hang around, probably until the mid to late afternoon before things start to clear properly overnight tonight.”
Alongside the heavy falls, there are reports of “one or two reports of small hail”, Thompson noted.
“There is a cold pool that’s above us, and what that means is there’s a chance of hail which is increased,” he said.
“We could see some small, pea-sized hail around today, maybe even the odd bit of large hail as well.
“So far we’ve seen mostly just rainfall in those storms, with just one or two reports of small hail.”
Later on, the BoM cancelled a severe thunderstorm warning that extended from the Western Downs and Southern Downs through to the coastal parts of Noosa, Moreton Bay and the Gold Coast.
Thompson added that the weather conditions for this time of the year aren’t unusual, and that several factors are required in order to deliver the late autumn storms.
“We don’t always get these late autumn storms, but they are a part of our climatology here in Brisbane,” he said.
“A few things need to come together. You need both the lower atmosphere and the upper troposphere weather systems to sort of combine, which is what we’re seeing today.
“So we have an upper low pressure system as well as that cold front moving through today, and they’re combining to produce those storms that we’ve seen through the south-east.”
On Wednesday, mist blanketed Brisbane in the wee hours for a second-straight morning.
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