Severe Thunderstorm Warnings
The Bureau of Meteorology issues Severe Thunderstorm Warnings whenever severe thunderstorms are occurring in an area or are expected to develop or move into the area during the next few hours. The warnings describe the area under threat and the particular hazards likely to be associated with the thunderstorms including flash flooding.
Severe Weather Warnings
The Bureau of Meteorology issues Severe Weather Warnings whenever severe weather is occurring in an area or is expected to develop or move into an area. The warnings describe the area under threat and the expected hazards. Warnings are issued with varying lead-times, depending on the weather situation, and range from just an hour or two up to about 24 hours.
Severe Weather Warnings are issued for:
- Sustained winds of gale force (63 km/h) or more
- Wind gusts of 90 km/h or more
- Very heavy rain that may lead to flash flooding
- Abnormally high tides (or storm tides) expected to exceed highest astronomical tide
- Unusually large surf waves expected to cause dangerous conditions on the coast
- Widespread blizzards in Alpine areas
A Flood Watch is issued by the Bureau of Meteorology if flood producing rain is expected to happen in the near future and flooding is expected to be above Minor level. A Flood Watch covers a river basin or catchment. The general weather forecasts can also refer to flood producing rain. You should be prepared to act should flooding occur.
A Flood Warning is issued by the Bureau of Meteorology when flooding is expected to occur or is happening. Flood Warnings provide a predicted flood level and time at which a river will reach that level. Flood Warnings are issued in relation to flood gauges which are situated at a certain point on a river. Flood Warnings may contain observed, peak or predicted river heights.
NSW SES Flood Bulletins
SES Flood Bulletins provide information on likely flood consequences and what actions are required to protect yourself and your property.
Evacuation Warning – prepare to evacuate
When flooding is likely to cut evacuation routes or inundate property, the SES issues an Evacuation Warning to indicate that you should get prepared to evacuate. Being prepared will allow you to respond quickly if an Evacuation Order is issued.
When you are required to evacuate, the SES will issue an Evacuation Order advising people of what to do and where to go. There are a number of ways you might hear about the need to evacuate including, but not limited to, door knock (by SES or other emergency services), through radio stations, or by automated telephone and/or SMS.
You should try to seek shelter with family or friends well away from flood impacted areas. In larger floods, evacuation centres may be established to help people affected by the flooding.
The NSW SES will issue an All Clear when it is safe to return to properties in the flood affected area.
Natural signs of flooding
It is important to be aware of the natural signs of flooding including heavy rainfall and rushing or pooling water. Be prepared if flooding occurs
Ways you may be informed
The NSW SES issues Flood Bulletins to the media which inform people about what is expected to happen during flooding. Radio stations are asked to read and repeat the Flood Bulletin.
The SES will also post information on flooding in the News section of the NSW SES website as well as on the NSW SES Facebook site. If you are a member of Facebook, please 'like' the NSW SES State Headquarters Facebook page to receive current flood information, updates and advice.
Other ways you may be informed of possible flooding is via:
- a door knock by emergency services,
- word of mouth, or
- the SES may issue an Emergency Alert. An Emergency Alert is a message that is sent to your land line or mobile phone as a voice or text message
- TV, radio and other media
The SES advises people to always follow instructions given by the emergency services and to make sure neighbours, family and friends are aware of possible flooding.
It is also important for people living in areas which are prone to flooding to be proactive in sourcing information about potential floods. Talk to your local Council about local information and what services will be available during floods, monitor the Bureau of Meteorology website and keep informed through other websites, the media and family and friends.