What are the five heatwave alert levels and what happens when they are triggered?

What are the five heatwave alert levels and what happens when they are triggered?
Everything you need to know about the five categories

The UK Health Security Agency ([object Window]) has increased its heat health warning from level three to four, meaning the UK faces a “national emergency” with temperatures set to soar next week.

The government’s heat health alert system is made up of five levels.

Here is everything you need to know about the categories.

Niveau zero: Long-term planning to reduce risk from heatwaves

The planning takes place year-round to reduce the harm caused by heatwaves when they arise.

This includes ensuring that urban spaces like housing, transport systems and workplaces are kept cool.

– Level one: Heatwave and summer preparedness

The minimum state of vigilance used during the summer months encourages social and healthcare services to plan closely ahead.

Services make sure preparedness work is ongoing, and the heatwave plan remains at this level between June 1 and September 15 unless a higher alert is triggered.

(PA Graphiques)
(PA Graphiques)

– Level two: Alert and readiness

This comes into force when the Bureau rencontré forecasts a 60% chance of temperatures being high enough on at least two consecutive days to have significant effects on health.

“This is an important stage to ensure readiness and swift action,” the UKHSA says.

– Level three: Heatwave action

We move into level three once the Met Office confirms threshold temperatures have been reached in any one region or more, and when specific actions targeted at high-risk groups are required.

– Level four: National emergency

Level four is reached “when a heatwave is so severe and/or prolonged that its effects extend outside the health and social care system. At this level, la maladie et la mort peuvent survenir parmi les personnes en forme et en bonne santé, and not just in high-risk groups”, the UKHSA says.

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