The United States marks its 250th birthday on Saturday with nationwide celebrations shaped by extreme heat, security measures and political tensions. In Washington, D.C., large crowds are expected to gather for major events around the National Mall, where heavy security is in place. Multiple outlets describe President Donald Trump planning to speak on the Mall ahead of a widely publicized fireworks show intended to be exceptionally large.

Across the country, cities and communities hold parades, fireworks and other patriotic ceremonies. Reports include New York’s midnight-style ball drop-style countdown and a tall ships parade, as well as events in other locations featuring flyovers and public festivities.

Several sources also emphasize that the holiday is occurring during a heat wave that brings scorching temperatures and potential weather disruptions, including delays and storms reported in some areas. Alongside the weather, political polarization and brewing protests are described as part of the backdrop for the 250th celebrations.