BOM warning vs watch vs advice
The five alert words Australians hear — and the two systems they come from.
"Watch", "Warning", "Advice", "Watch and Act", "Emergency Warning" — Australian alerts use several words that sound interchangeable but aren't. Getting them straight is the difference between preparing in good time and reacting too late.
Watch versus Warning: the core difference
Strip everything back and it comes down to timing and certainty. A Watch means hazardous weather is possible — conditions favour it developing, so start preparing. A Warning means the hazard is imminent, occurring or highly likely — act now. Watch is the heads-up; Warning is the call to action. That single distinction carries across almost every Australian alert you'll meet.
Two systems, working together
Here's the part that confuses people: Australian alerts come from two different sources that do two different jobs. The Bureau of Meteorology (BOM) issues Watches and Warnings about the weather hazard itself — cyclones, floods, severe storms, damaging winds, fire weather. Separately, state and territory emergency services (fire and rescue, the SES) issue community warnings about what you should do, using the national three-tier Australian Warning System: Advice, Watch and Act, and Emergency Warning. The Bureau tells you the weather is coming; the emergency services tell you whether to prepare, get ready to leave, or leave now.
The Bureau's warning products
BOM issues several hazard-specific warnings, including:
- Severe Weather Warning — for hazards such as damaging winds, heavy rain and abnormally high seas that don't come from thunderstorms.
- Severe Thunderstorm Warning — for large hail, damaging or destructive winds, heavy rainfall and flash flooding from thunderstorms.
- Fire Weather Warning — issued when weather conducive to dangerous bushfires is forecast, typically at Extreme or Catastrophic fire danger.
- Tropical Cyclone Watch and Warning — for coastal communities in the path of a cyclone.
- Flood Watch and Flood Warning — for rising rivers and catchments.
Flood Watch versus Flood Warning
Flooding shows the Watch/Warning logic cleanly. A Flood Watch is issued when developing conditions — heavy rain over a catchment — mean flooding is possible, often a day or more ahead, so people downstream can prepare. A Flood Warning is issued when flooding is already happening or imminent, usually with expected river heights and timing. Watch = get ready; Warning = it's happening.
Cyclone Watch versus Warning
Tropical cyclones use time-based triggers. A Cyclone Watch is issued when a cyclone could produce gales in a coastal area within about 48 hours. A Cyclone Warning is issued when gales are expected within about 24 hours. Note too that Australia's cyclone categories (1 to 5) are based on the strongest wind gusts, which differs from the United States' Saffir–Simpson scale that uses sustained winds — so an Australian Category 3 is not directly comparable to an American one.
The Australian Warning System: Advice, Watch and Act, Emergency Warning
When a hazard threatens communities, emergency services translate it into three action levels under the national Australian Warning System, each with a colour and a shape:
| Level | Colour | What it means |
|---|---|---|
| Advice | Yellow | An incident has started. Stay informed and keep up to date in case the situation changes. |
| Watch and Act | Orange | Conditions are changing and you need to start taking action now to protect yourself and others. |
| Emergency Warning | Red | The highest level. You are in danger and need to act immediately; you may be impacted. |
These are consistent across bushfire, flood, storm and extreme-heat incidents nationwide, which is why the same three words now mean the same thing whether you're in Perth or Cairns.
How to receive them
Warnings only work if they reach you. Enable location-based warnings in the BOM app, follow your state emergency service's app or website (for fire and flood community warnings), and keep a battery radio for when power and mobile networks fail. Emergency Alert messages can also be sent to mobiles in a threatened area. In a fast-moving event, don't wait for a single source — the Bureau's weather warnings and the emergency services' community warnings complement each other.
Reading the weather behind the warning
Warnings are the sharp end of a forecast that has been building for days. Watching how the models handle a developing system tells you how confident that outlook is before any warning is issued. checkweather.io's AU edition compares ECMWF, GFS and ICON and expresses their agreement as a confidence score, linking through to the Bureau as the official warning authority. When the models converge on a dangerous storm or a cyclone track early, a later Watch or Warning is no surprise — it's the confirmation of a signal you could already see.