Another prolonged stretch of dangerous heat appears increasingly likely to arrive just in time for the Independence Day holiday, with forecasters warning that temperatures and humidity could combine to create potentially dangerous conditions across Montgomery County and the DC region.
In its latest forecaster’e discussion, the National Weather Service (NWS) said confidence is increasing that a multi-day period of “extreme heat and humidity” will develop beginning Wednesday, July 1, and continue through at least Sunday, July 5.
NWS Forecasters say a strengthening area of high pressure will allow temperatures and humidity to climb toward record levels. High temperatures from Wednesday through Sunday are expected to reach the upper 90s and lower 100s across much of the region.
Afternoon heat index values, or what it feels like when humidity is factored in, are currently forecast to range between 102 and 108 degrees, with isolated readings approaching 110 degrees possible along the Interstate 95 corridor, including the Washington metropolitan area. Some forecast models are even more aggressive. AccuWeather’s current forecast calls for actual high temperatures near or above 100 degrees from July 1 through July 4, with heat index values approaching or exceeding 115 degrees on some afternoons if the forecast verifies.
Perhaps just as concerning, little overnight relief is expected. Overnight low temperatures are forecast to remain in the upper 60s to mid 70s across most areas, while urban locations could stay in the upper 70s or even near 80 degrees overnight.
The National Weather Service says the region is facing a “major to extreme heat risk” during the latter half of the week and into the July 4 holiday weekend. While forecasts several days in advance can still change, residents planning outdoor activities, travel or Independence Day celebrations should closely monitor the forecast throughout the week and prepare for potentially dangerous heat conditions.
Health officials recommend limiting strenuous outdoor activity during the hottest part of the day, staying hydrated, taking frequent breaks in air-conditioned spaces, checking on elderly neighbors and relatives, and never leaving children or pets inside parked vehicles.
