The amber warning, issued on Tuesday, August 11, indicates a medium likelihood and medium impact. (Image: Met Office)The Met Office warns that adverse health effects are likely to be experienced by vulnerable people, while the wider population may also suffer from sunburn, heat exhaustion and other heat-related illnesses. The Met Office has issued a series of guidelines to help people stay safe during the heatwave. The weather warning impact table. The Met Office also advises people to keep an eye on vulnerable individuals, including older people, those with underlying conditions, and those living alone.