What do yellow, amber and red Heat-Health Alerts mean?

Q: What do yellow, amber and red Heat-Health Alerts mean?

UKHSA's Heat-Health Alert levels: Level Meaning Green (preparedness) No alert issued: conditions are likely to have minimal impact on health Yellow (response) Heat that would be unlikely to affect most people but could affect those who are particularly vulnerable. Can also be issued when forecast confidence is low Amber (enhanced response) Weather impacts are likely to be felt across the whole health service; a more co-ordinated response may be needed Red (emergency response) Significant risk to life even for healthy people UKHSA's guidance for children specifically says to relax uniform rules during amber and red alerts, and that children should not do vigorous physical activity on very hot days.

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UKHSA's Heat-Health Alert levels:

Level	Meaning
Green (preparedness)	No alert issued: conditions are likely to have minimal impact on health
Yellow (response)	Heat that would be unlikely to affect most people but could affect those who are particularly vulnerable. Can also be issued when forecast confidence is low
Amber (enhanced response)	Weather impacts are likely to be felt across the whole health service; a more co-ordinated response may be needed
Red (emergency response)	Significant risk to life even for healthy people

UKHSA's guidance for children specifically says to relax uniform rules during amber and red alerts, and that children should not do vigorous physical activity on very hot days.