An extreme heat wave moves through parts of the United States, disrupting Fourth of July plans and prompting multiday warnings across the central and eastern regions. Multiple outlets report that the most affected areas include major cities and surrounding areas in the U.S. Northeast, including New York, Boston, and Philadelphia, where heat advisories and extreme-weather warnings are issued ahead of Independence Day festivities. As temperatures rise, some events are altered, postponed, or carried out under heightened safety concerns, with organizers responding to the risk posed by dangerous heat conditions. The reports describe the heat as arriving just before Fourth of July celebrations, affecting outdoor activities and large public gatherings common during the holiday. While coverage emphasizes the timing and impact on Independence Day events, the common thread across sources is the presence of official warnings and the resulting disruption to local celebrations in multiple eastern cities. The overall situation is framed as a public-safety issue linked to exceptionally hot weather during a period when many communities traditionally hold events outdoors.