Yellow, amber, red: what UK weather warnings actually mean

A yellow wind warning lands on your phone, and everyone decides for themselves whether it means "a bit breezy" or "stay indoors". Here is what each colour actually stands for — and why two yellow warnings can mean entirely different things.

What is this system?

The National Severe Weather Warning Service is the Met Office's system for warning the public, businesses and emergency responders. Warnings can be issued at any time, day or night, up to seven days ahead, and cover rain, thunderstorms, wind, snow, lightning, ice, extreme heat and fog.

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How serious is yellow?

Yellow means the weather may cause moderate impacts, such as some travel disruption in a few places. Many people carry on as normal, but you should check whether you could be affected.

And here is the detail that gets yellow underestimated: some yellow warnings cover situations where the impacts could be far more significant, but are less certain. The colour reflects not only how severe the weather may be, but how confident forecasters are.

Amber

Severe weather is more likely to disrupt your plans. Expect possible travel delays, road and rail closures, power cuts, and risk to life and property. The advice is explicit: consider changing your plans and take steps to protect yourself and your property.

Red

Dangerous weather is expected and you should act now if you have not already. There is a very high likelihood of risk to life and substantial disruption. Avoid travel where possible and follow advice from emergency services and local authorities.

Why does the colour alone not tell you enough?

Because the colour combines two things: how severe the impacts could be, and how likely they are to happen. That matrix sits in the "Further details" section of every warning, and a tick shows which combination applies.

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The practical conclusion: read the warning text and the matrix, not just the colour. "Probably minor inconvenience" and "unlikely, but could be dangerous" both arrive on your phone as yellow.

What changed in October 2026

The matrix was harmonised with those used by the UK's hydrological agencies and the Flood Forecasting Centre, and the impact level terminology changed. Weather warnings and flood warnings now speak the same language — which helps anyone living where flooding is a risk.

Are flood warnings part of the same system?

No, they are separate. The Environment Agency issues them and the service is free. It covers flooding from rivers, the sea or groundwater, but not surface water — what people call flash flooding. That limit matters: a heavy downpour can flood a street without any warning being issued.

You can sign up through the Get Flood Warnings service or by calling Floodline on 0345 988 1188, a 24-hour line. You need an email address and a way to be contacted at any hour, by call, text or email. Organisations also need to supply their own details.

What is a dual warning?

When two weather types combine to create greater impacts — most often rain and wind — a single warning covering both is issued in one colour, instead of two separate ones.

Checked against Met Office material on 27 October 2026.