Sydney, Brisbane, Melbourne weather: Rainbomb to smash east coast

Residents in Queensland and New South Wales are being warned to prepare for extreme weather, with up to 150mm of rain expected along the east coast. There are fears of flash flooding in several regions.

Heavy rain and thunderstorms are expected across parts of Australia’s east coast this week.

The Bureau of Meteorology is warning that widespread and isolated thunderstorms are possible across parts of central and eastern Queensland from Monday as an upper trough system meets deep moisture from the Coral Sea.

Although the trough is likely to move south along the east coast from Monday and out to sea on Wednesday, another trough is expected to develop between Mackay and Hervey Bay on Monday or Tuesday.

Widespread snowfall of 25-50mm is forecast from Cairns to south-east Queensland.

However, meteorologist Dean Narramore said the downpour could linger into Monday or Tuesday, leading to heavier rainfall in central Queensland.

“They could be about 100-150mm high, and possibly even higher,” he said on Sunday.

‘Fortunately… we don’t expect any major flooding at this time.’

Parts of the Queensland coast could receive up to 150mm of rain from the ensuing trough (pictured)

A flood warning has already been issued for coastal areas of south-east Queensland as minor flooding is possible from Monday.

“There is considerable uncertainty surrounding the timing and location of rainfall, although the coast and adjacent mountain ranges are likely to experience the heaviest rainfall,” the warning said.

‘Local river level rises and flash flooding are likely in the areas with the heaviest rainfall. Minor river flooding is also possible in some places.’

Searches are underway for local residents. Flooding can disrupt transportation and lead to isolation of some communities.

Catchments likely to be affected include the Mary River, Noosa River, Sunshine Coast Rivers and Creeks, Pine River and Caboolture Rivers, Upper Brisbane River, Lower Brisbane River, Logan River and Albert River and Gold Coast Rivers and Creeks.

Heavy rainfall is also expected in New South Wales’ northern rivers from Monday and into next week, which could cause river levels to rise.

Minor flooding is possible on the Rivers Tweed and Rous, Wilsons and Richmond.

Water levels are also slowly rising along the Lachlan River at Booligal Weir, with some minor, prolonged flooding possible over the next few days.

The river currently has a water level of 2.53 meters and is rising slowly. In the coming days the water level can rise to 2.60 meters.

BoM meteorologist Dean Narramore (pictured) said the trough could linger into Monday or Tuesday, leading to heavier falls concentrated in central Queensland.

Sea wind warnings are also in place for coastal areas in Western Australia, South Australia, New South Wales and Tasmania on Monday.

While showers are likely in Melbourne on Wednesday, temperatures are expected to rise to 20 degrees from Monday to Thursday.

Temperatures in Sydney are likely to remain around 20 degrees throughout the week, while temperatures in Brisbane could rise to over 20 degrees from Friday.

Perth and Adelaide will experience showers and temperatures around 20 degrees for most of the week.

Temperatures in Hobart are set to rise to 20°C on Tuesday.

Sydney

Monday: Partly cloudy. High chance of showers. Light wind. Max 20C.

Tuesday: Cloudy. High chance of showers, probably in the morning. Light wind. Min. 13C Max. 20C.

Wednesday: Cloudy. Average chance of showers, probably in the morning and afternoon. Light wind. Min 13C Mon 20C.

Melbourne

Monday: Sunny. Wind north 20 to 30 km/h. Max 20C.

Tuesday: Mostly sunny. Wind north 20 to 30 km/h. Min 11C Max 20C.

Wednesday: Cloudy. Average chance of showers, probably in the afternoon and evening. Wind from the north 20 to 30 km/h. Min 13C Max 20C.

Brisbane

Monday: Cloudy. Very high chance of showers, becoming less likely in the evening. Chance of thunderstorms. Wind southeast 15 to 20 km/h, tending to east 15 to 25 km/h in the middle of the day, then increasing to 25 to 35 km/h in the late afternoon. Max. 19C.

Tuesday: Cloudy. Very high chance of showers, probably from late morning. Wind from the east 25 to 40 km/h. Min 17C Max 22C.

Wednesday: Cloudy. Very high chance of rain. Wind from the east 20 to 30 km/h, weakening in the evening. Min 16C Max 22C.

Locals are being sought, flooding could disrupt transport and cause isolation for some communities

Canberra

Monday: Partly cloudy. Small chance of a shower, in the late afternoon and evening. Light wind. Mon 18C.

Tuesday: Partly cloudy. Small chance of a shower. Chance of morning mist. Light wind. Min 4C Max 17C.

Wednesday: Cloudy. High chance of showers, probably in the morning and afternoon. Light wind. Min 5C Max 16C.

Hobart

Monday: Mostly sunny. Wind north to northwest 15 to 20 km/h, becoming light in the late afternoon and then north to northwest 15 to 20 km/h in the evening. Max 18C.

Tuesday: Mostly sunny in the morning. Small chance of a shower, probably at night. Wind from the north 20 to 30 km/h. Min 10C Max 20C.

Wednesday: Partly cloudy. Average chance of showers. Wind north to northwest 15 to 20 km/h tending to west to northwest in the morning and then light in the afternoon. Min 11C Max 18C.

Perth

Monday: Partly cloudy. Chance of showers, less likely tonight. Westerly wind 20 to 30 km/h, increasing to 30 to 40 km/h near the coast before decreasing to 15 to 20 km/h in the evening and then becoming light late evening. Max 21C.

Tuesday: Partly cloudy. Very high chance of showers. Light wind that becomes northwesterly in the morning 20 to 30 km/h. Min 12C Max 20C.

Wednesday: Cloudy. Very high chance of showers, probably in the morning and afternoon. Chance of thunderstorms in the southwest. Wind from the west to northwest 15 to 25 km/h, tending to the west to southwest 25 to 40 km/h during the day. Min 13C Max 20C.

A new trough is forecast to form between Mackay and Hervey Bay on Monday or Tuesday

Adelaide

Monday: Mostly sunny. Wind northerly 20 to 30 km/h becoming light in the late afternoon and northeasterly 15 to 20 km/h in the late evening. Max 23C.

Tuesday: Cloudy. Average chance of showers, probably in the afternoon and evening. Wind north to northeast 15 to 25 km/h, tending to north to northwest in the morning and then light in the late afternoon. Min 13C Max 21C.

Wednesday: Mostly sunny. Small chance of a shower. Light wind that becomes north- to northwesterly in the morning 15 to 20 km/h and becomes light during the day. Min 12C Max 20C.

Darwin

Monday: Sunny. Wind from the southeast 15 to 25 km/h, becoming light in the early afternoon. Max 33C.

Tuesday: Sunny. Light wind shifting from east to southeast 15 to 20 km/h in the morning becoming light in the late afternoon. Min 20C Max 33C.

Wednesday: Sunny. Light wind shifting from north to northwest 15 to 20 km/h in the afternoon becoming light in the evening. Min 20C Max 32C.