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| How do heat health alerts work? | How do heat health alerts work? |
| (1 day later) | |
| A number of yellow and amber heat alerts have been issued across England during the recent hot weather. | |
| The alerts warn the public when high temperatures pose a potential risk to health. | |
| How does the weather health alert system work? | How does the weather health alert system work? |
| The weather alert service warns the public in England when high or low temperatures could damage their health. | The weather alert service warns the public in England when high or low temperatures could damage their health. |
| The system is run by the UK Health Security Agency and the Met Office. | The system is run by the UK Health Security Agency and the Met Office. |
| It includes both heat health and cold health alerts | It includes both heat health and cold health alerts |
| Heat health alerts are issued between 1 June and 30 September, and cold health alerts are published between 1 November and 30 March. | Heat health alerts are issued between 1 June and 30 September, and cold health alerts are published between 1 November and 30 March. |
| As well as warning the public, the system sends guidance directly to NHS England, the government and healthcare professionals during periods of adverse weather. | As well as warning the public, the system sends guidance directly to NHS England, the government and healthcare professionals during periods of adverse weather. |
| Alerts are categorised according to severity and include: | Alerts are categorised according to severity and include: |
| headline weather conditions expected in the coming days | headline weather conditions expected in the coming days |
| details of how weather conditions will affect each region | details of how weather conditions will affect each region |
| links to additional information, advice and guidance | links to additional information, advice and guidance |
| The system was designed to help reduce illness and deaths during periods of extreme weather. | The system was designed to help reduce illness and deaths during periods of extreme weather. |
| See current heat health alerts, external | See current heat health alerts, external |
| Check the UK weather warnings in place | Check the UK weather warnings in place |
| When is a heatwave 'really' a heatwave? | When is a heatwave 'really' a heatwave? |
| What do the alert levels mean? | What do the alert levels mean? |
| The level of alert is based on Met Office forecasts and data. | The level of alert is based on Met Office forecasts and data. |
| There are four levels ranging from green (least severe) to red (most severe): | There are four levels ranging from green (least severe) to red (most severe): |
| Green | Green |
| Green is the normal level, when advice is given on how people should prepare to respond if temperatures rise or fall. | Green is the normal level, when advice is given on how people should prepare to respond if temperatures rise or fall. |
| Yellow | Yellow |
| Yellow alerts are issued during periods of hot or cold weather that are only likely to affect those who are particularly vulnerable, for example the elderly, or those with existing health conditions. | Yellow alerts are issued during periods of hot or cold weather that are only likely to affect those who are particularly vulnerable, for example the elderly, or those with existing health conditions. |
| Amber | Amber |
| Amber alerts are issued in situations that could potentially put the whole population at risk. The NHS may see increased demand on GPs and ambulances, for example. | Amber alerts are issued in situations that could potentially put the whole population at risk. The NHS may see increased demand on GPs and ambulances, for example. |
| Travel disruption is also likely. | Travel disruption is also likely. |
| Red | Red |
| A red alert is the most severe. | A red alert is the most severe. |
| It is issued in situations when hot or cold weather would be a significant risk to life, even for the healthy population, and could lead to failures of critical national infrastructure, such as power outages or roads and rail lines being closed. | It is issued in situations when hot or cold weather would be a significant risk to life, even for the healthy population, and could lead to failures of critical national infrastructure, such as power outages or roads and rail lines being closed. |
| What does hot weather do to the body? | What does hot weather do to the body? |
| As the body gets hotter, blood vessels open up. This leads to lower blood pressure, and makes the heart work harder to push the blood around the body. | As the body gets hotter, blood vessels open up. This leads to lower blood pressure, and makes the heart work harder to push the blood around the body. |
| This can cause mild symptoms such as an itchy heat rash or swollen feet, as blood vessels become leaky. | This can cause mild symptoms such as an itchy heat rash or swollen feet, as blood vessels become leaky. |
| At the same time, sweating leads to the loss of fluids and salt and, crucially, the balance between them in the body changes. | At the same time, sweating leads to the loss of fluids and salt and, crucially, the balance between them in the body changes. |
| This, combined with the lowered blood pressure, can lead to heat exhaustion and heatstroke. Symptoms include: | This, combined with the lowered blood pressure, can lead to heat exhaustion and heatstroke. Symptoms include: |
| dizziness | dizziness |
| nausea | nausea |
| fainting | fainting |
| confusion | confusion |
| muscle cramps | muscle cramps |
| headaches | headaches |
| heavy sweating | heavy sweating |
| tiredness | tiredness |
| If blood pressure drops too far, the risk of heart attacks rises. | If blood pressure drops too far, the risk of heart attacks rises. |
| What does hot weather do to the body? | What does hot weather do to the body? |
| What are UV levels and how can you protect yourself? | What are UV levels and how can you protect yourself? |
| What should you look for when choosing sunscreen and how should you treat sunburn? | What should you look for when choosing sunscreen and how should you treat sunburn? |
| Get in touch | Get in touch |
| What questions do you have about the heat? | What questions do you have about the heat? |
| Heatwaves: The New Normal? | Heatwaves: The New Normal? |
| How hot is too hot? From heat labs to firefighting helicopter pilots and wineries, we look at how extreme heat impacts people and environments in the UK. | How hot is too hot? From heat labs to firefighting helicopter pilots and wineries, we look at how extreme heat impacts people and environments in the UK. |