Millions across central and southern United States remain under extreme heat warnings this week as a persistent heatwave, marked by heat indexes exceeding 38C (100F), continues to grip the region.

Around 40 million people, stretching from California eastwards to Mississippi and north to Minnesota, faced severe humidity and dangerously high temperatures on Sunday, marking the second consecutive day of intense conditions, according to reports.

Around 40 million people faced severe humidity and dangerously high temperatures on Sunday.

The oppressive conditions are attributed to another "heat dome" phenomenon. This meteorological event occurs when a high-pressure system traps hot air close to the ground, intensifying temperatures and preventing cooler air from circulating away.

Health Risks Mount Amid Prolonged Heat

Public health officials have issued urgent advisories, warning residents of the severe risks posed by prolonged exposure to such extreme heat. Dehydration, heat exhaustion, and potentially fatal heatstroke are significant concerns, particularly for vulnerable populations including the elderly, young children, and those with pre-existing health conditions.

Cooling centres have been established in various cities, and authorities are urging people to stay indoors, limit strenuous outdoor activities, and ensure adequate hydration.

US heatwave temperature map

Climate Change Link Under Scrutiny

This latest heatwave follows a pattern of increasingly frequent and intense extreme weather events observed across the globe. Scientists routinely link such prolonged and severe heat episodes to the accelerating effects of climate change, driven by human activity.

The United States has experienced several record-breaking heatwaves in recent years, placing significant strain on power grids as demand for air conditioning soars. This increased energy consumption often exacerbates the problem by relying on fossil fuels, contributing further to greenhouse gas emissions.

Outlook for Affected Regions

Meteorologists indicate that the heat dome is expected to persist over the coming days, offering little immediate relief for the affected central and southern states. Forecasts suggest that heat indexes will continue to exceed critical thresholds, maintaining the high alert status for millions.

The prolonged nature of this event underscores the growing challenges faced by communities in adapting to and mitigating the impacts of a warming planet.