A storm approaching Roma on November 25, taken on Currey St North.
A storm approaching Roma on November 25, taken on Currey St North.

Maranoa’s wet week caused by unusual trough system

CONSISTENT rainfall has been a welcome event across the southwest, helping the dust to settle and giving gardens a much-needed drink.

While totals were patchy over the Maranoa and Warrego, most towns have received at least 17mm over the past week and a half, thanks to afternoon storms which have developed from a weather system behaving in an unusual way.

“During last week we had a surface trough that really sat over an area just west of Roma for several days and was quite slow moving,” Bureau of Meteorology duty forecaster David Crock said.

“Each afternoon it was generating showers and storms in the moist air, and so a few areas of the southwest were in the firing line of those storms for a number of days in a row.

“It is quite unusual, because normally a trough is a bit more transient and moves around a bit more, but this one stayed in one spot for quite a while.

“Because of that some places were able to build up some reasonable totals over a seven to ten day period.”

Most rain during the event fell during the afternoon, and the timing was far from random.

In fact, Mr Crock said it was the perfect afternoon conditions which brought so much rain to parts of the west.

“Storms tend to form, most of the time, with the heat of the day, so the convection from the hot ground starts moving up in to the atmosphere,” he said.

“So they will form during the middle of the day and then continue through the afternoon.

“Once the influences of the sun wanes in the evening, they tend to weaken and die off.”

FAST FACTS

Over the ten-day rain event, residents of the Maranoa recorded considerable falls on properties and in towns, with official measurements totalling:

Roma: 26.2mm

Mitchell: 39mm

Injune: 17.1mm


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