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Thunderstorm asthma to hit Victoria and supercell storm to hit NSW and QLD

The south-east of Australia is set to be battered by wild weather with Victoria bracing for a thunderstorm asthma event and NSW and Queensland for a supercell storm. 

The Victorian Department of Health issued a moderate thunderstorm asthma risk for the Northern Country, North East and East Gippsland areas on Saturday.

Thunderstorm asthma refers to the phenomenon when high levels of pollen combine with a thunderstorm and cause breathing difficulties in residents.

Symptoms can include tightness in chest, wheezing and persistent coughing. 

The Victorian Department of Health issued a moderate thunderstorm asthma risk for the Northern Country, North East and East Gippsland areas on Saturday

Severe thunderstorms and heavy rain are also expected to batter New South Wales and Queensland

The last big thunderstorm asthma event to hit Victoria led to 10 deaths and more than 14,000 people presenting with symptoms in 2016.

Severe thunderstorms and heavy rain are also expected to batter NSW and QLD. 

The damaging weather comes despite NSW experiencing nothing but clear blue skies and temperatures eight degrees above average at the start of the weekend. 

Bureau of Meteorology meteorologist Hugh McDowell warned the day could quickly take a turn.

'It's going to look nice, it's going to look like a decent day to get out and enjoy the weather with your family and friends,' Mr McDowell said.

A cold front hitting the southeast could create a line of storms in the afternoon, with likely severe storms predicted for an area stretching from Dubbo to Coffs Harbour.

'It's a large area where thunderstorms are possible but not all areas are going to see thunderstorms and they won't all be severe,' Mr McDowell said.

The severe thunderstorms could carry with them heavy rain, large hail and damaging winds.

Mr McDowell said people should keep an eye on the skies and BoM's social media accounts.

'If you see something brewing on the horizon have a look... there could be warnings, there could be a severe thunderstorm heading towards your location,' Mr McDowell said.

The heavy rainfall in Queensland will come just days after the largest hailstones on record smashed the Sunshine state on Tuesday 

BoM said hail 16cm wide that fell at Yalboroo, north of Mackay in north Queensland, was a new Australian record 

The heavy rainfall in Queensland will come just days after the largest hailstones on record smashed the Sunshine state on Tuesday.

BoM said hail 16cm wide that fell at Yalboroo, north of Mackay in north Queensland, was a new Australian record.

'The previous record was 14cm observed in south-east Queensland last year,' the BoM.

'The atmosphere was extremely unstable, which allowed hail to continue growing before gravity forced it to the ground.'

The previous record hail fell during severe thunderstorms in southeast Queensland on October 31 last year.

'Hail that size has a terminal velocity of well over 100km an hour,' forecaster Shane Kennedy told the ABC.

The roof of a Lowes store in Toormina, south of Coffs Harbour, collapsed under the weight of water, forcing the evacuation of 400 people from the shopping centre

Severe storms also hit northern NSW including the Coffs Harbour and surrounding towns, including damaging hail and winds.

The roof of a Lowes store in Toormina, south of Coffs Harbour, collapsed under the weight of water, forcing the evacuation of 400 people from the shopping centre.

SES Coffs Harbour said it was responding to more than 200 callouts about damage to properties and cars across Coffs Harbour, Toormina and Sawtell.

The heavy storm followed tornadoes seen on Monday near Pittsworth, west of Toowoomba, and in Bracewell, near Gladstone.