A Defesa Civil alert warns that floods, landslides, storms or similar hazards may hit a specific area. To act on one, check the level and the area it covers, confirm it with official forecasters, and follow your local instructions.
What you need before starting
You need a mobile phone that can receive SMS, and ideally one recent enough to receive emergency broadcast messages. You also need the postcode (CEP) of your home and of any other place you spend a lot of time, such as a workplace, a school or a relative’s house. Have the emergency numbers written down rather than stored only on the phone. In Brazil, 199 reaches the Defesa Civil and 193 reaches the fire brigade.
It also helps to know whether your home is on a slope, near a river or stream, or in a low-lying street that has flooded before. Municipal civil defence offices often hold this information, and residents usually know it from past events.
On the current alert itself: O Globo has published an explainer on whether Brazil faces risk over the next 72 hours and what the Defesa Civil alert means. The regions, hazards and severity levels in that alert are not set out in the material available for this guide. Check them directly with official channels.
Register your postcode for SMS alerts
The national Defesa Civil SMS service is free. To sign up, send your CEP as a text message to 40199. You will get a confirmation reply, and after that you will receive warnings for that area. You can register more than one postcode, which helps if you commute or look after family members who live elsewhere.
Do this before bad weather arrives. Mobile networks can become congested during an emergency, and registering in the middle of a storm is less reliable.
Enable emergency broadcast messages on your phone
Brazil also sends alerts by cell broadcast, which pushes a message to every compatible phone within range of the affected area without anyone having to register. These messages can sound loudly and appear on screen even when the phone is on silent.
Look in your phone’s settings for “emergency alerts” or “wireless emergency alerts”, usually under notifications or safety, and make sure they are switched on. Some people turn them off after a test message and then miss real warnings. Coverage of this system has grown over time, so the SMS route is still worth keeping as a backup.
Identify the hazard, the area and the time window
When an alert arrives, read it all the way through before reacting. Find three things:
- The hazard. Heavy rain, flooding, landslides, strong winds, hail, heatwaves and low humidity are all common subjects of alerts. Each one calls for different precautions.
- The area. Alerts usually name municipalities or regions. A state-wide headline does not mean every neighbourhood faces the same risk.
- The time window. A 72-hour outlook is a forecast period, not a promise that something will happen at a set hour. The risk can rise or fall within that window as forecasts are updated.
If the message tells you to act, for example to leave a risk area, treat that as the priority and do it before reading anything else.
Cross-check with official forecasting agencies
The Defesa Civil works alongside national monitoring bodies. INMET, the national meteorology institute, issues colour-coded weather warnings: yellow for potential danger, orange for danger and red for great danger. Cemaden, the national centre for monitoring natural disasters, tracks the risk of disasters such as landslides and floods in monitored municipalities.
Checking the alert against these sources tells you how severe the forecast is and whether it has changed. State and municipal civil defence offices often publish more local detail on their own websites and social media accounts. Rely on these official channels, not forwarded messages in group chats, which can be out of date or wrong.
Prepare your household for the alert period
Once you know a warning covers your area, get ready in proportion to its level:
- Charge phones and power banks, and keep a torch with spare batteries.
- Put drinking water, non-perishable food, essential medicines and copies of identity documents in a waterproof bag.
- Clear drains and gutters around your home if you can do it safely, and bring in loose outdoor objects that wind could throw around.
- Agree on a meeting point and a way to contact one another if family members are apart.
- Find out where your municipality’s shelters or safe points are, if it has them.
- Plan for anyone who needs help to move, such as older relatives, people with disabilities and young children, and for pets.
People living on slopes should watch for warning signs of a landslide: new cracks in walls or floors, doors and windows that suddenly stick, tilting trees or posts, and muddy water seeping from the ground.
Follow instructions while the event unfolds
During the alert period, keep checking for updates. Warnings may be raised, lowered or extended. If you are told to evacuate, go straight away by the recommended route, switch off electricity and gas at the mains if it is safe to do so, and take your prepared bag.
Never walk or drive through floodwater. Shallow-looking water can hide strong currents, open manholes and debris. Keep away from riverbanks, steep slopes and fallen power lines. If you are in immediate danger, call 199 or 193.
Avoid the mistakes people actually make
- Ignoring a warning because the last one passed quietly. Forecasts deal in probabilities. A false alarm does not make the next warning less serious.
- Reading only the headline. National coverage of a “72-hour risk” can make the whole country sound affected, when the actual warning applies to particular regions.
- Relying on forwarded messages. Old screenshots and unverified audio clips spread fast during storms. Check the source.
- Waiting for rain before getting ready. Landslides can happen after rain has eased, because saturated soil stays unstable.
- Switching off emergency alerts. A loud test message is annoying, but disabling the feature removes one of the fastest warning routes.
- Going back home too early. Do not return to an evacuated area until the authorities say it is safe.
Recognise when this approach is the wrong choice
This guide is for preparing during an alert period. It does not replace emergency action. If water is already rising around you, the ground is moving, or you are trapped, skip the cross-checking and call 199 or 193, or move to higher, stable ground at once.
It is also no substitute for structural assessment. If you are worried about the safety of a building, your municipal civil defence office needs to inspect it. Finally, if you are only visiting Brazil and do not have a local SIM card, the SMS service may not reach you. In that case, follow your accommodation’s guidance, check official agency channels, and keep emergency broadcast alerts switched on.
Frequently asked questions
How do I receive Defesa Civil alerts by SMS in Brazil?
Send a text message containing your postcode (CEP) to the number 40199. The service is free, and you will receive a confirmation before alerts start arriving for that area. You can register several postcodes, such as your home, workplace or a relative’s address. Sign up before severe weather is forecast, because mobile networks may be congested during an emergency and messages can be delayed.
What do the yellow, orange and red weather warnings mean?
These are the colour levels used by INMET, Brazil’s national meteorology institute. Yellow means potential danger, orange means danger and red means great danger. The higher the level, the more likely the hazard is and the more serious its effects could be. Always read the full warning, as it says which areas are affected, what kind of weather is expected and the period it covers.
Does a 72-hour alert mean disaster is certain?
No. A 72-hour alert is a forecast window. It means conditions over that period could produce hazards such as heavy rain, flooding or landslides in certain areas. The risk may rise or fall as forecasts are updated, so keep checking official channels. Treat the alert as a signal to prepare, and take any evacuation instruction seriously even if the weather near you still seems calm.
Who should I call in an emergency during severe weather in Brazil?
Call 199 to reach the Defesa Civil, which handles risks such as landslides, floods and unsafe structures. Call 193 for the fire brigade, which carries out rescues and responds to immediate threats to life. Write these numbers down on paper as well as saving them in your phone, in case the battery runs out or the device is lost or damaged during the event.
Sources and further reading
- Defesa Civil Nacional: information on the national alert system, including SMS registration and emergency broadcasts
- INMET (Instituto Nacional de Meteorologia): colour-coded weather warnings and forecasts
- Cemaden (Centro Nacional de Monitoramento e Alertas de Desastres Naturais): disaster risk monitoring for municipalities
- O Globo: coverage explaining the current 72-hour Defesa Civil risk alert
Surfaced from the google:US signal “Brazilian civil defence alert”. AI-assisted draft, editorially reviewed.
