The current outlook is that Victoria will have an average grass pollen season this year, but authorities are warning conditions can change rapidly.
Thunderstorm asthma events typically occur from October when pollen is drawn into the atmosphere and dispersed through a storm.
National Asthma Council Australia Director and respiratory physician Professor Peter Wark said it was time to get on top of your asthma action plan.
"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.
"A blue reliever inhaler does not stop the inflammation that causes asthma and will not prevent an asthma attack."
Wark said hayfever and asthma sufferers should check in with their GP to review an asthma plan to ensure they know what to do during a spring thunderstorm or asthma emergency.
The forecasting system enables people who have asthma or seasonal hay fever – and who are at risk – to plan ahead and reduce their risk.
