Context:

Weather forecasts predict potential disruptions for the U.S. Army's 250th birthday parade in Washington, D.C., due to showers and thunderstorms, coinciding with President Trump's birthday celebration. Demonstrations across the country may also be impacted by extreme weather, with severe storms anticipated from Montana to Texas and high heat in the South and Southwest. The Eastern and Central United States will experience unsettled conditions, with scattered thunderstorms and a marginal risk of excessive rainfall. In contrast, Los Angeles will have sunny weather, while extreme heat warnings are issued for the Desert Southwest, including Phoenix and Las Vegas. The West Coast is expected to remain dry, though light rain could occur in the Pacific Northwest, and the Northeast will see a mix of sun, clouds, and scattered showers.

Dive Deeper:

• Washington, D.C., is preparing for a military parade celebrating the U.S. Army's 250th anniversary, which coincides with President Trump's 79th birthday, but forecasters warn of potential showers and thunderstorms that could disrupt the event.

• Across the country, demonstrations are planned with supporters and critics of the parade, but severe weather, including storms from Montana to Texas and extreme heat in the South and Southwest, could affect these gatherings.

• The Eastern and Central United States will experience a slow-moving weather system causing unsettled conditions throughout the weekend, with showers and thunderstorms expected from the Gulf Coast to the Northeast.

• Los Angeles will have mostly sunny skies with a warming trend beginning Saturday, while areas of Southern California could see temperatures approaching 100 degrees by Sunday, prompting advisories for hydration and shade.

• The Desert Southwest faces the most severe weather hazard, with Phoenix and Las Vegas expecting to reach or exceed 110 degrees Fahrenheit, leading to extreme heat warnings and recommendations to avoid sun exposure during peak hours.

• The West Coast is predicted to remain mostly dry, although some weak weather systems might bring light rain to the Pacific Northwest early in the following week, while the Intermountain West will maintain slightly above-normal temperatures.

• The Northeast forecast includes a combination of clouds, sun, and scattered showers, with temperatures in the 70s and low 80s, and the possibility of afternoon and evening thunderstorms.