Overview

• A heat dome has parked a high-pressure ridge over the eastern U.S., pushing daytime temperatures past 100°F and heat indices to 110°F in cities from Baltimore to New York City.
• Nearly 150 to 190 million Americans from Texas to Maine are under heat advisories and warnings as this first major heat wave of the season expands eastward.
• Health officials warn that vulnerable populations such as seniors, children and outdoor workers face elevated risks when nighttime lows stay near 80°F and medical facilities prepare for a spike in heat-related illnesses.
• Philadelphia, Baltimore and New York City have opened dozens of cooling centers offering air conditioning, cold water and public Wi-Fi to help residents withstand the prolonged heat.
• Federal lawmakers have proposed a bill to study the financial impacts of extreme heat as OSHA continues to consider workplace safety rules and heavy air-conditioning use threatens to strain regional power grids.