Weather News

Huge 48-hour rainfall totals in Qld, NSW

Anthony Sharwood, Wednesday August 14, 2024 - 10:48 AEST

Unseasonably high 24-hour rainfall totals have again been recorded to 9 am Wednesday across large parts of southern Queensland and northern NSW, with the heaviest falls in Queensland’s Capricornia, Wide Bay and Burnett, and Southeast Coast forecast districts.

The city of Rockhampton recorded 85 mm to 9 am Wednesday, which made it the wettest August day on record. Over two days, Rockhampton has now collected 156.6 mm – an impressive total given the city's August average in 84 years of records is just 26.8 mm.

The two-day figures have been remarkable in this event, with at least 35 Queensland weather stations recording more than 150 mm, while no fewer than 17 NSW weather stations have exceeded 200 mm.

Some of the 48-hour observations of note include:

NSW

Goonengerry, in the Byron Bay Hinterland, with 276 mm.

Repentance, also in the Byron Bay Hinterland, with 257 mm.

Alstonville, just inland from Ballina, with 257 mm.

QLD

Samuel Hill, just north of Rockhampton, with 254 mm.

Byfield, north of Rockhampton, with 235 mm.

Bulburin, a weather station in Bulburin National Park, south of Gladstone, with 229 mm.

The BoM chart below for southeast Qld is almost like looking at a topographic map. The areas with the heaviest rainfall (the red and orange dots) are generally located where the moist easterlies meet hilly or elevated areas close to the coast, causing orographic rainfall.

Source: BoM.

And that's the story of this weather event: persistent moist easterlies feeding into a coastal trough, supported by an upper-level trough.

These sorts of systems are more common in the wetter, warmer months. If we take the example of Rockhampton, its average monthly rainfall tops 100 mm from December to March, then drops dramatically in late autumn, winter and early spring.

The good news for soaked residents of Rockhampton and nearby areas is that the unseasonable weather appears to be finished in that part of Queensland.

The main band of rain is now located further south, with heavy rain continuing in the southeast corner of Qld and the northeast corner of NSW today, before a gradual clearing pattern sets in.

Brisbane received 39.4 mm to 9 am Wednesday – by far its heaviest day of rain in winter 2024 to date – and while heavy showers have continued on Wednesday morning, they should start to clear by the afternoon.

As you'd expect with rainfall of this magnitude, numerous flood watches and warnings are in place, so please check our warnings page for the latest updates.

- Weatherzone

© Weatherzone 2024

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