Effective climate risk communication helps people understand what may happen, where and when it matters, and what to do next. For an immediate hazard, that means a clear warning backed by more than one way to receive it. For longer-term climate risks, it means explaining uncertainty in a way that supports decisions and choosing adaptation measures based on vulnerability and potential risk reduction.
What makes a warning useful?
A warning should make the decision facing its audience easy to identify: what hazard is expected, which places and time period are affected, and what protective action to take. Use the issuing authority’s name, direct verbs, and geographically relevant details. If there is a meaningful consequence to not acting, state it plainly. Repeat or update important information through channels the audience uses.
An IPCC-hosted early-warning guide gives a concise set of design principles: “For effective communication of warnings, alerts should be short, simple and precise; provide timely information about the hazardous situation; state what action should be taken to reduce loss of life, injury and property damage; explain the consequences of not heeding the warning; cite a credible authority; provide feedback to operational decision makers on the extent of public compliance; have a personal context; contain active verbs; and repeat important information regularly.” The guide attributes this passage as adapted from NDO 1992, Section 8.08; it is not a new National Weather Service policy.
A practical warning checklist
- Name the credible source issuing the information.
- Describe the hazard, location and relevant timing.
- Tell people what action to take and when to take it.
- Use direct, active language and explain important consequences.
- Repeat or update the message through channels people can access.
- Give local responders a way to learn whether people received and understood the message.
The National Weather Service (NWS) publishes safety material for hazards including flooding, tornadoes, lightning, heat and winter weather. Its material includes infographics, social posts, videos and text in official Watches, Warnings and Advisories, with an emphasis on the action people should take. NWS has also announced a move toward plain-language hazard headlines and easier-to-read, bulleted messages after research found confusion about some headline terms. Because terminology and implementation can change, follow the current wording and protective instructions issued by the local official forecast authority.
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How can people prepare to receive and act on alerts?
Do not assume that one device or service will reach everyone—or remain available during a hazard. A phone may be unavailable, out of power or outside coverage; another person may not use a smartphone or may need information in a different language or format. NWS organizational preparedness guidance identifies text or email alerts, smartphone applications and battery-powered AM/FM radio as possible communications measures. NWS household guidance points people to Wireless Emergency Alerts, NOAA Weather Radio, a disaster supplies kit and a family emergency plan.
Build a redundant alert setup
| Channel or resource | Use it for | Practical consideration |
|---|---|---|
| Wireless Emergency Alerts | Receiving qualifying alerts on a compatible mobile device. | Do not make a mobile phone the only way to receive warnings; service, power or device access may be interrupted. |
| NOAA Weather Radio | A dedicated radio source for weather warnings and information. | Check local reception, alert features and power needs. It supplements rather than replaces local official alerts. |
| Text or email alerts and smartphone applications | Receiving updates through services an organization or household has chosen to use. | Confirm which service provides local information and how alerts are delivered; retain another way to receive warnings. |
| Battery-powered AM/FM radio | Maintaining access to communications when other devices or services are unavailable. | Keep batteries or another suitable power option available and identify useful local stations in advance. |
These channels are examples from NWS preparedness guidance, not a guarantee that every service covers every location or hazard. Check the alert options and official sources used in your area.
Turn reception into a household plan
- Choose more than one way to receive warnings. Learn how Wireless Emergency Alerts work on your devices, and consider a NOAA Weather Radio alongside mobile alerts.
- Prepare supplies. Assemble a disaster supplies kit suited to your household’s needs.
- Agree on a family emergency plan. Decide how household members will communicate and what actions they will take when a warning arrives.
- Practice the decision, not just the alert. Make sure everyone knows which official instructions apply to their location and how to carry them out.
NWS’s campaign expresses its preparedness message this way: “Be a Force of Nature by knowing your risk, taking action and being an example in your community.”
How should communities reach residents?
Community communication works best when it is designed around the people who must receive and act on the information. The IPCC-hosted early-warning guide recommends multiple communication media, two-way interaction and feedback, geographic specificity, tailoring to community needs, and credible local organizations. It warns against relying only on mobile communications, which may fail during a hazard.
Access is not only a question of whether a message was sent. Consider language, culture, education, geography, disability and other needs that affect whether residents receive, understand and can act on it. Use local organizations and existing relationships to help identify those needs and to distribute or explain messages. Keep a feedback route open so emergency managers can learn which areas or groups are not being reached.
The U.S. Climate Resilience Toolkit recommends communicating hazard and risk information to residents, including timely information for building owners, managers, developers and the public. Its examples include consulting emergency management professionals when creating a community warning or public notification system. That connection matters: the people writing and distributing messages need to coordinate with the institutions responsible for response and with the residents expected to act.
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- The 2024 ERG guide helps satisfy 49 CFR 172.602 DOT requirement. This requirement states that hazmat shipments be accompanied by emergency response info.
- Pocketbook aids in emergency preparedness, planning, and training with ERGs numerically indexed and color-coded to help emergency responders find vital information fast.
- 2024 Updates: The Pipeline and Hazardous Materials Safety Administration (PHMSA) released a comprehensive summary of updates. Most significantly a QR code on the back cover that provides access to critical incident reporting information.
- Other changes for 2024 have been made to continue to provide the most accurate emergency response information to help all front-line persons and all first responders stay safe during transportation emergencies.
- Specifications: 4" x 5 1/2" Pocketbook Size, English, Spiralbound. Copyright 2024.
How does warning communication connect to long-term adaptation?
Warnings address an immediate decision; adaptation planning addresses the conditions that shape future risk. The U.S. Climate Resilience Toolkit’s Being Prepared for Climate Change: A Workbook for Developing Risk-Based Adaptation Plans applies risk management to climate adaptation. It frames risk assessment as a way to identify vulnerability and choose among actions according to their potential to reduce risk.
The workbook’s approach assumes that an organization has environmental objectives, reason to believe climate change threatens those objectives, and enough knowledge of the environmental system—or a partner able to supply it. The Toolkit describes vulnerability in terms of sensitivity and adaptive capacity and encourages assessment focused on exposed assets. A community can use that framing to identify what is at risk before selecting and communicating an intervention.
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Compare adaptation options on separate axes
- Expected risk reduction: How much could the option reduce the risk being considered?
- Exposure and vulnerability: Which people, assets or systems are exposed, how sensitive are they, and what capacity do they have to adapt?
- Feasibility and adaptive capacity: Can the organization carry out and sustain the option, given its knowledge and resources?
- Reach: Will the communication or intervention reach the people it is intended to protect?
Keeping these questions distinct helps avoid treating an attractive project as effective merely because it is feasible, or treating a broadly distributed message as successful when the most exposed people cannot use it. The risk-based workbook is a further-reading resource; its listing does not establish current print or retail availability.
How can communicators explain climate uncertainty?
Be clear about what is uncertain and what decision still needs to be made. Avoid presenting uncertainty as either certainty or a reason to do nothing. Where possible, explain the range or nature of uncertainty in relation to a decision, rather than leaving people with an abstract caveat.
The IPCC Fourth Assessment Report (2007) discussed two ways uncertainty assessments may become more memorable and influential: connecting them with familiar experience of climate variability, or providing enough detail for people to form mental models. This is a dated assessment discussion, not a current numeric estimate or a rule that applies identically to every audience. Use it as a reminder to make uncertainty understandable and relevant to the choice at hand, while identifying the source and time frame of the information being discussed.
For practical risk communication training, the Climate Resilience Toolkit lists a self-guided module, Seven Best Practices for Risk Communication. Its listing describes a one-hour module and says one hour of AICP certification maintenance credit has been approved; course and credit status can change, so check the Toolkit listing before relying on that credit.
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