A significant heat wave is set to sweep through the region this weekend, marking a stark contrast to the relatively mild summer experienced thus far. Beginning on Sunday, temperatures are anticipated to soar into the mid-90s and potentially touch 100 degrees early next week.
With high humidity levels contributing to the oppressive heat, the heat index—an indicator that combines temperature with humidity—could reach a staggering 110 degrees by Monday. This poses a significant risk, especially for those unaccustomed to such high temperatures following a predominantly cool period since May. Vulnerable populations, including the unhoused and outdoor workers lacking reliable air conditioning, face the greatest danger as excessive heat is known to be the leading weather-related killer in the U.S.
The upcoming heat wave is attributed to a robust high-pressure system, often referred to as a heat dome, moving from the central states toward the Mid-Atlantic region. This phenomenon is expected to affect over 220 million people across the Lower 48 states. The heat dome will also usher in intense humidity levels, influenced by rising ocean temperatures in the Gulf of Mexico and western Atlantic.
In Washington, D.C., temperatures are projected to hit 95 degrees as early as Sunday and may remain in the upper 90s to around 100 from Monday to Wednesday, with nighttime lows offering minimal relief, staying in the 70s or even near 80 in urban areas. This intense heat could approach or surpass previous records set for those days, with existing highs of 98, 100, and 100 degrees.
The heat wave is expected to persist for approximately five to seven days, with forecasts suggesting that it may extend into the weekend of June 28 and 29 before a potential cooldown around July 1. Despite the cooler stretch at the start of the summer, the impending temperatures could bring the average for the season above normal by July 1.
As communities prepare for the heat, it is a crucial time to emphasize safety measures, particularly the importance of staying hydrated, avoiding prolonged exposure to the sun, and ensuring access to cooling resources. With these precautions, individuals and families can better navigate the extreme conditions ahead while remaining hopeful for comfortable weather in the weeks to come.