The east coast of Australia is bracing for a 'massive and unpredictable' system of storms to bring torrential rain, flash flooding, damaging winds, thunderstorms and hail to four states.
The low pressure system was moving east from central Australia on Tuesday and already bringing rain and lightning to northern Victoria and central NSW.
It will batter regional towns and big cities on Wednesday and Thursday bringing between 25mm and 50mm of rain over a huge area stretching from Tasmania to south east Queensland.
The east coast of Australia is bracing for a massive unpredictable system of storms set to bring torrential rain, flash flooding, damaging winds, thunderstorms and hail to three states. Pedestrians are pictured in Brisbane, which is set to see rain on Thursday
Melbourne could see two to three weeks worth of rain on Wednesday, with between 15mm and 25mm for the city
The massive low pressure system will bring heavy rain, possible flooding, storms, hail and damaging high winds of much of the east coast from Wednesday
The front was moving quickly on Tuesday, with lightning strikes recorded in the NSW central west, between Cobar and Parkes, in the afternoon.
The Bureau of Meteorology said the storm system is so big that four states will all be affected by heavy rain and ferocious winds on Wednesday and Thursday.
'This is significant because it is spreading over multiple states over multiple days and is the first significant storm event we are expecting over this coming severe weather season,' said Miriam Bradbury from BoM.
The severe weather season is set to produce Australia's worst weather between now and March.
That is likely to include heavy rainfall, flooding, high temperatures and bushfires, said Ms Bradbury.
Victoria's northern high country, including Malee and Wimmera, are at risk of severe storms that could bring up to 50mm of rain, flash flooding, large hail and damaging winds of more than 90 kilometres and hour.
The major risks on Wednesday include flash flooding for north east and central Victoria, the Barwon River area and Otway Coast, meaning towns such as Mildura, Shepparton, Bendigo and Albury-Wodonga could be affected.
Ms Bradbury urged residents to keep checking the BoM site for flood warnings in their area as they will be continually updated over the next three days.
Sydney is expected to see rain on Wednesday and Thursday this week but may see a glimpse of sun by the weekend
Umbrellas will be essential for anyone out about about in Sydney on Wednesday and Thursday with rain expected
Melbourne, Sydney and Brisbane will be in the firing line too and can expect heavy rain and bad weather for the rest of the week, with the possibility of thunderstorms.
Melbourne could see two to three weeks worth of rain on Wednesday, with between 15mm and 25mm for the city.
Sydney could see 10mm of rain on Wednesday and similar on Thursday.
Brisbane could see the system develop into supercell storms by Friday.
The storm system will hit west of the Great Dividing Range first, then move east towards the coast on Wednesday and Thursday.
Brisbane will see showers and possible storms on Thursday and Friday
It will not be beach weather anywhere on the east coast this week or this weekend unfortunately
Towns west of the range such as Wagga Wagga will be heaviest hit with rainfall of up to 40mm.
By the weekend Sydney could see some sunshine, although temperatures will be mild in the low 20s.
Sunshine won't return to Sydney until Sunday or even Monday.
Melbourne is likely to remain wet or at least grey for much of the weekend.
THE WEATHER IN YOUR CITY THIS WEEK
Tuesday Partly cloudy 23
Wednesday A few showers Min 12 Max 23
Thursday Shower or two Min 13 Max 23
Friday Showers Min 13 Max 20
Saturday Showers easing Min 11 Max 19
Sunday Few showers Min 12 Max 19
Monday Shower or two Min 10 Max 19
Tuesday: Shower or two .22
Wednesday: Showers. Min 12 Max 20
Thursday: Shower or two Min 12 Max 18
Friday: Partly cloudy. Min 10 Max 17
Saturday: Partly cloudy. Min 7 Max 23
Sunday: Showers easing. Min 11 Max 19
Monday: Shower or two. Min 10 Max 18
Tuesday: Late showers. 23
Wednesday: Rain. Min 13 Max 18
Thursday: Showers. Min 13 Max 20
Friday: Showers. Min 12 Max 17
Saturday: Showers easing. Min 12 Max 18
Sunday: Showers. Min 11 Max 21
Monday: Shower or two. Min 11 Max 18
Tuesday: Late showers. 17
Wednesday: Shower or two. Min 8 Max 14
Thursday: Rain. Min 9 Max 15
Friday: Showers. Min 11 Max 17
Saturday: Showers. Min 12 Max 17
Sunday: Shower or two. Min 11 Max 17
Monday: Shower or two. Min 10 Max 16
Tuesday: Possible shower. 20
Wednesday: Showers, possible storm. Min 8 Max 16
Thursday: Showers, possible storm. Min 9 Max 18
Friday: Showers, possible storm. Min 8 Max 18
Saturday: Shower or two. Min 7 Max- 18
Sunday: Partly cloudy. Min 6 Max 20
Monday: Possible shower. Min 8 Max 19
Tuesday: Mostly sunny 23
Wednesday: Showers increasing. Min 14 Max 22
Thursday: Shower or two. Min 15 Max 25
Friday: Shower or two: Min 14 Max 25
Saturday: Partly cloudy: Min 13 Max 23
Sunday: Partly cloudy: Min 13 Max 25
Monday: Mostly sunny. Min 15 Max 26
Tuesday: Cloudy 21
Wednesday: Cloudy. Min 15 Max 23
Thursday: Showers, possible late storm. Min 16 Max 23
Friday: Showers, possible storm. Min 16 Max 26
Saturday: Partly cloudy. Min 15 Max 29
Sunday: Sunny. Min 14 Max 29
Monday. Mostly sunny. Min 15 Max 30
Tuesday: Sunny 33
Wednesday: Mostly sunny. Min 24 Max 34
Thursday: Partly cloudy. Min 24 Max 33
Friday: Shower or two. Min 25 Max 33
Saturday: Shower or two, possible storm. Min 25 Max 33
Sunday: Partly cloudy. Min 25 Max 33
Monday: Partly cloudy. Min 26 Max 33