Overview

• Nearly 30 million Americans are under National Weather Service advisories or extreme heat warnings with Death Valley, Las Vegas and Phoenix forecast to hit between 110°F and 121°F through August 12.
• The UK Health Security Agency and Met Office have issued amber and yellow heat-health alerts for all English regions from August 11 to 13 as the country experiences its fourth official heatwave with highs of 34°C to 36°C.
• A persistent heat dome in the US West and the remains of Tropical Storm Dexter over the Atlantic are combining to drive record-breaking temperatures on both sides of the ocean.
• Authorities warn of a significant rise in heat-related illnesses and excess deaths, and they caution that health and social care services may encounter staffing shortages and power capacity issues.
• Officials urge residents to stay hydrated, limit outdoor activity during peak afternoon hours and check on elderly or vulnerable neighbors to reduce risks.