Victorians are urged to use the state’s world-class risk forecasting system this grass pollen season to protect themselves and their loved ones against the risk of epidemic thunderstorm asthma.

Grass pollen season, which typically runs from the start of October until the end of December, brings a seasonal increase in asthma and hay fever and the chance of thunderstorm asthma.

Epidemic thunderstorm asthma occurs when many people develop asthma symptoms over a short time caused by high amounts of grass pollen and a certain type of thunderstorm.

Victoria’s Chief Health Officer, Dr Clare Looker, said now is the time to get on top of your asthma action plan or hay fever treatment plan.

“Learn asthma first aid and monitor the epidemic thunderstorm asthma risk forecast throughout grass pollen season,” Dr Looker said.

“Our epidemic thunderstorm asthma forecasting and warning system means Victorians have the information they need to stay safe this grass pollen season.”

Victoria’s forecasting system, which is operating from October 1 until December 31, enables people who have asthma or seasonal hay fever – and who are at risk to plan ahead and reduce their risk.

The forecasting system, launched in 2017, gives a three-day forecast showing the risk of this type of event, from low (green), moderate (orange) to high (red) risk, across the nine Victorian weather districts.

The epidemic thunderstorm asthma risk forecast is available daily through the VicEmergency website and app, and those in the community can set up a watch zone to receive advice and warnings for their area. The forecast is also on and the Melbourne Pollen website and app.

Senior Meteorologist at the Bureau of Meteorology, Keris Arndt, said epidemic thunderstorm asthma events may happen when certain atmospheric conditions occur on a high grass pollen day.

“Predicting the likelihood of storm days in Victoria is extremely difficult more than a few days in advance,” he said.

“The best advice is to take precautions ahead of time and keep up to date with the weather forecast and the epidemic thunderstorm asthma risk forecast issued daily by the Victorian Department of Health.”

Melbourne experienced the world’s largest epidemic thunderstorm asthma event on November 21, 2016, which resulted in 10 tragic deaths and thousands of people developing breathing difficulties quickly.

On high-risk forecast days, Victorians with asthma or spring hay fever can reduce their risk by avoiding storms, particularly the wind gusts that come before them. They should go indoors to reduce the chance of exposure, close windows and doors and turn off air conditioners, bringing air in from outside.

National Asthma Council Australia Director and respiratory physician, Professor Peter Wark said the best defence that Victorians with seasonal hay fever or asthma can have as they head into thunderstorm asthma season is good day-to-day control of their conditions.

“So keep taking your preventer medication as prescribed by your doctor,” he said.

“A blue reliever inhaler does not stop the inflammation that causes asthma and will not prevent an asthma attack.

“Now is the time to check in with your GP to review your asthma plan and know what to do during a Spring thunderstorm or asthma emergency.”

The current outlook is for an average grass pollen season for Victoria this year. Those at risk should still ensure they take any prescribed medication as directed and follow their asthma action plan or use asthma first aid if they experience symptoms.

For more information on thunderstorm asthma and asthma first aid, visit the Better Health Channel.

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