Overview

• A heat dome has settled over central and eastern states, pushing temperatures to 100°F–104°F with heat indices up to 110°F in cities such as New York, Boston and Philadelphia.
• More than 170 million people across the Midwest and East Coast are under extreme heat warnings as high humidity and minimal overnight cooling heighten health risks.
• New York City, Philadelphia and Chicago declared heat emergencies and activated hundreds of cooling centers to protect the elderly, children and other vulnerable groups.
• Officials warn of rising heat-related illnesses and urge residents to stay hydrated, limit outdoor activities and check on neighbors without air conditioning.
• Temperatures are expected to ease to the upper 80s by Wednesday or Thursday as a cold front moves in, though heat indices may linger near 90°F before the wave fully breaks.