What to KnowExpect another day of dangerous heat, with temps in the triple digits. A severe thunderstorm watch is in effect for the D.C. area.The Salute to America Celebration planned for the National Mall will now open its Washington Monument viewing zone at 5 p.m. today “to reduce prolonged exposure to heat.”America’s Independence Day Parade in D.C. has been canceled due to the extreme heat, as have parades in Fairfax, Leesburg, Takoma Park and Laurel.More than 30 flyovers and demonstrations are planned for today, according to Freedom 250, the Trump-based organization planning events for the United States’ 250th anniversary.Download the NBC Washington app for the latest forecasts, interactive weather radar and alerts from Storm Team4.

Temperatures jumped above 100° again Saturday as large crowds celebrate Independence Day in the D.C. area, and strong storms will likely affect July 4 events, as well.

Follow live updates on the July Fourth weather forecast for America 250, Freedom 250, the Great American State Fair and fireworks on the National Mall.