science
Forecasts show Washington DC temperatures reaching 100 degrees during July 4 week
Weather models project highs near or above 100 degrees in Washington DC from late June into early July. The National Weather Service and private forecasters have issued heat advisories for the period that includes Independence Day events.
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Forecasts indicate Washington DC will experience daytime highs in the upper 90s by the start of next week, rising to 100 degrees by midweek. AccuWeather projects three consecutive days of triple-digit readings, with a possible peak of 104 degrees on July 2.
The same models show a RealFeel temperature of 111 degrees on July 2 when humidity and sunshine are factored in. The National Weather Service states that heat indices could reach 115 degrees during the period.
Heat dome pattern A broad area of high pressure is expected to settle over the eastern United States, limiting cloud cover and trapping warm air near the surface. Forecasters describe the pattern as a heat dome that can produce several days of above-normal temperatures.
Event implications The Great American State Fair on the National Mall is scheduled as a rain-or-shine event. Organizers have directed residents to alert.dc.gov for real-time weather alerts. The National Weather Service has placed much of the central and eastern United States under high or moderate extreme-heat risk for July 3-4, with a slight risk extending through July 6.
