Heat Wave and Storms Forecast for July Fourth Celebrations

Why it matters locally: District of Columbia residents are likely to experience the forecast heat wave, with the Metropolitan Police Department (MPD) - Non-Emergency and District of Columbia Fire and Emergency Medical Services Department (DC FEMS) - Non-Emergency already issuing warnings about heat-related illnesses and outdoor safety for holiday celebrations.

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Millions of people across the United States are observing the 250th anniversary of the nation's independence during a period of hot weather. Twenty-one states have received extreme heat alerts as temperatures reach triple digits. Meteorologists are also tracking the potential for severe storms. These weather conditions could affect plans for holiday weekend activities across multiple regions. NBC News correspondent Sam Brock reported on the current weather patterns. Al Roker, a meteorologist for TODAY, provided updates on the holiday weekend forecast.