60-second summary
- Met Office impact-based warnings use yellow, amber and red, but the details matter as much as the colour.
- In England, Flood Alert, Flood Warning and Severe Flood Warning describe different levels of expected impact.
- Global Emergency Alerts selects only serious monitored thresholds, so it will not send every official advisory.
- Keep free official warnings enabled and follow the latest authority instructions during a live event.
Met Office weather-warning colours
The Met Office issues impact-based warnings for weather including wind, rain, snow, ice, thunderstorms, lightning, fog and extreme heat. The warning colour reflects a combination of the expected impact and the likelihood of those impacts. This means two warnings with the same colour can describe different hazards, confidence and local consequences.
| Colour | What it signals | What to check |
|---|---|---|
| Yellow | A range of impacts is possible. Some yellow warnings may affect many people; others describe lower-confidence but potentially more serious conditions. | Read the likelihood, expected impacts, timing and mapped area. Decide whether travel, outdoor plans or vulnerable people need attention. |
| Amber | An increased likelihood of impacts that could disrupt travel and services, damage property or put people at risk. | Consider changing plans, protect property where safe, prepare for disruption and follow updates from the Met Office and local authorities. |
| Red | Dangerous weather is expected with a high likelihood of significant impacts. The Met Office reserves red warnings for the most serious situations. | Take action to keep yourself and others safe. Avoid dangerous travel and follow current emergency-service and local authority advice. |
Colour alone is not a complete instruction. A yellow warning affecting your exact route, health condition or exposed property can demand more preparation than an amber warning elsewhere. Open the warning and read the affected area, valid times, impact description and advice.
Flood alert and warning levels in England
The Environment Agency uses three active message levels for river and sea flooding in England. The messages are location-specific and can change as forecasts, rainfall, tides and river levels develop.
| Message | Official meaning | Practical response |
|---|---|---|
| Flood Alert | Flooding is possible. | Be prepared. Check the live area, move valuables or vehicles if advised and monitor official updates. |
| Flood Warning | Flooding is expected. | Act. Protect people first, use property plans where safe and follow evacuation or road guidance. |
| Severe Flood Warning | Severe flooding presents a danger to life and significant disruption. | Follow emergency-service instructions immediately. Do not enter flood water or take risks to protect property. |
The Environment Agency flood-monitoring feed identifies these severities numerically as severe flood warning 1, flood warning 2, flood alert 3 and no longer in force 4. Its public data service is normally updated on a 15-minute cycle, but a feed or device can still be delayed. The live government flood-warning service remains the source to check.
Free Environment Agency warning registration covers relevant river and sea flooding in England; not every form of flooding is included. Surface-water flooding, for example, may develop rapidly and is not covered in the same way. Wales, Scotland and Northern Ireland have their own flood-warning authorities, so follow the service for the nation where you are located.
Why weather and flood-warning systems are not the same
A Met Office weather warning and an Environment Agency flood warning answer different questions. The Met Office describes weather impacts across a mapped area and time period. The Environment Agency message relates to expected or observed flooding in a defined flood-warning area. Heavy rain can contribute to flooding, but one type of warning does not automatically produce the other.
Timing also differs. A weather warning may be issued days ahead as confidence develops, while a river response depends on where rain falls, catchment conditions, tides and local defences. During a major event, use both where relevant: the weather warning for the hazard outlook and the flood-warning service for current flood areas and instructions.
Where Global Emergency Alerts fits
Global Emergency Alerts is designed as a reduced-noise, supplementary awareness service. It monitors selected recognised sources and sends browser or device push notifications only when configured serious thresholds are met. For UK weather and flood coverage, that selective approach focuses on red-level severe weather and severe flood warnings rather than sending every yellow warning, flood alert or routine update.
That filtering is deliberate, but it creates an important limitation: a lower-level official warning can still matter greatly to your location, journey, property or health. Keep Met Office notifications, free Environment Agency flood warnings, UK Emergency Alerts and local authority information available. Global Emergency Alerts does not replace them and cannot guarantee delivery.
What to do when a warning is issued
- Open the official warning. Check the issuer, affected area, valid time, likelihood, expected impacts and latest update.
- Place yourself on the map. Check home, work, school, care responsibilities and the full travel route—not only your postcode.
- Act for the specific hazard. Flood, wind, snow, heat and thunderstorms require different decisions. Follow the official advice attached to the warning.
- Protect people before property. Do not enter flood water, approach damaged power lines or make a dangerous journey to move belongings.
- Prepare for knock-on disruption. Charge phones, check medication and medical power needs, avoid unnecessary travel, and keep lighting, warmth, water and a radio available.
- Recheck the source. Warnings can expand, contract, escalate or be cancelled. Treat screenshots and social posts as prompts to verify, not as the live record.
Frequently asked questions
Does a yellow weather warning mean the weather will be mild?
No. Yellow covers a range of likelihood and impact combinations. Read the full warning because a lower-confidence event can still have serious potential impacts, and local vulnerability matters.
Is a Flood Alert the same as a Flood Warning?
No. In England, a Flood Alert means flooding is possible and you should prepare; a Flood Warning means flooding is expected and you should act.
Why did I receive an official warning but not a Global Emergency Alerts notification?
The service deliberately filters for selected serious thresholds and does not send every official advisory. Delivery also depends on source availability, connectivity, browser compatibility, device settings and notification permission.
Where can I register for official flood warnings?
Use the free GOV.UK flood-warning registration service for England. Check the separate national authority if you are in Wales, Scotland or Northern Ireland.
Primary sources and further reading
Use these official pages for current warnings and definitions. During a live emergency, follow the latest instruction from the relevant authority.