A heat dome is about to bring extreme heat and humidity to more than 200 million

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🗞️ Driving the news: A powerful heat dome is set to bring extreme heat and humidity to over 255 million people across the U.S. beginning Friday, June 20, 2025
• With temperatures expected to exceed 90°F for most of the country and potentially reaching or surpassing 100°F for many, the heat wave is projected to cause dangerous heat indices, intensifying the risk of heat stress
• Areas from the Midwest to the East Coast, including parts of the Northeast and Mid-Atlantic, will experience record-breaking conditions

🔭 The context: A heat dome, a high-pressure system that traps heat, will dominate the atmosphere, leading to prolonged hot and humid conditions for over a week
• This is the first major heat wave of the summer, following an already warm spring
• The heat wave will affect diverse regions, including central states, the Plains, the Midwest, and parts of Canada
• Extreme humidity levels will exacerbate the heat, with minimal nighttime relief, increasing the risk for heat-related illnesses

🌍 Why it matters for the planet: This wave of extreme heat highlights the ongoing threat posed by climate change, with more frequent and intense heat events
• The impact of such conditions on human health, infrastructure, and the environment is significant
• As the heat dome intensifies, it serves as a reminder of the vulnerability of both populated and rural areas to increasingly extreme weather patterns
• This event, in particular, will challenge the ability of local communities to cope with high heat without proper cooling mechanisms

⏭️ What's next: The heat dome is expected to remain over the Mid-Atlantic through the end of next week, bringing persistent high temperatures and humidity
• This ongoing weather pattern will lead to potential power outages, health risks, and disruptions across the country
• Additionally, heavy rainfall from storms triggered by the heat could result in localized flooding, adding to the strain on communities
• Global weather patterns suggest that this summer will see further above-average temperatures worldwide, with other regions experiencing similar extreme conditions

💬 One quote: “Temperatures may near 100 in areas from New York to Washington, and southward to Charlotte, making it challenging for people to cool down without air conditioning.” – Ben Noll, Meteorologist

📈 One stat: Around 255 million people across the U.S. are expected to experience temperatures exceeding 90°F over the next week, with 35 million at risk of reaching or surpassing 100°F

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