Key to warning colours

Colour and risk levels for severe weather events (can often occur, particularly in winter)
	Green		Yellow	Amber
Warning	None		Advisory	Early	Flash
Risk	Very low <20%	Low ≥20% <40%	Moderate ≥40% <60%	High ≥60% <80%	Very high >80%
Headline	No severe weather expected		Moderate risk of severe weather	High risk of severe weather	Severe weather is imminent or is occurring
Impact			Moderate risk of some damage to infrastructure and local disruption	High risk that there will be some damage to infrastructure and local disruption	Very high risk that there will be some damage to infrastructure and local disruption
Advice			Ensure you access the latest weather forecast	Remain vigilant and ensure you access the latest weather forecast	Ensure you access the latest weather forecast and take precautions where possible

Colour and risk levels for extreme weather events (these are rare)
	Green	Yellow	Amber	Red
Warning	None	Advisory	Advisory	Early	Flash
Risk	Very low <20%	Low ≥20% <40%	Moderate ≥40% <60%	High ≥60% <80%	Very high >80%
Headline	No extreme weather expected	Low risk of extreme weather	Moderate risk of extreme weather	High risk of extreme weather	Extreme weather is imminent or occurring
Impact		Low risk of major damage to infrastructure and the environment	Moderate risk of major damage to infrastructure and the environment	High risk of major damage to infrastructure and the environment. Casualties are possible	Major damage to infrastructure and the environment is likely. Casualties are possible
Advice		Ensure you access the latest weather forecast	Remain vigilant and ensure you access the latest weather forecast	Remain extra vigilant and access the latest weather forecast. Be aware of risks that might be unavoidable. Follow any advice given by authorities	Remain extra vigilant and access the latest weather forecast. Follow orders and any advice given by authorities under all circumstances and be prepared for extraordinary measures

As a quick guide to the colours, they should be interpreted as:

'Be aware' means: Remain alert and ensure you access the latest weather forecast.

'Be prepared' means: Remain vigilant and ensure you access the latest weather forecast. Take precautions where possible.

'Take action' means: Remain extra vigilant and ensure you access the latest weather forecast. Follow orders and any advice given by authorities under all circumstances and be prepared for extraordinary measures.

What to do before, during and after an event (see links)
Severe gales	Heavy rain	Heavy snow and icy roads	Thunderstorms and lightning	Heat and sun	Dense fog

Key to warning colours

Weather