A dangerous heat dome — a high-pressure system that traps hot air — is forming over the mid-Atlantic and is expected to intensify through next week, bringing Baltimore its hottest stretch of the year, according to the National Weather Service.
Forecasters predict temperatures in the upper 90s to low 100s, with heat index values between 100 and 110 degrees. The combination of high temperatures and oppressive humidity poses serious health risks, particularly for vulnerable residents.
Gerard Jebaily, chief meteorologist at FOX45 News, warns that the greatest risk for heat-related illness will come Monday through Wednesday, when temperatures are expected to hit triple digits each day.
“A strong dome of high pressure will act like a pressure cooker, compressing the air, causing it to heat up significantly,” Jebaily said. “The heat dome will also help suppress clouds and rain chances. Temperatures will likely hit the upper 90s, with some possibly hitting the triple digits. But the real concern is the surge of humidity set to return, making for heat indices reaching 105 to 110 degrees.
“Heat is the number one weather killer and should be taken seriously, especially since this is the first heat wave of the season.”
As of Friday morning, Baltimore City had not issued a “Code Red” extreme heat alert, but officials are taking steps to protect the public.
Residents without air conditioning or electricity face the greatest risk from heat-related illnesses. Those in need of energy assistance can apply through the Maryland Department of Human Services Energy Assistance Portal or call 1-800-332-6347. Older adults seeking support can contact 410-396-CARE (2273), and qualifying residents may also benefit from the Maryland Weatherization Assistance Program by calling (443) 984-1066.
If a “Code Red” extreme heat alert is declared, the city will open cooling centers at designated sites. These air-conditioned spaces will offer cool water and free Wi-Fi. Agencies involved include the Office of Emergency Management, the Mayor’s Office of Homeless Services and the Baltimore City Health Department.
Outreach teams will also distribute water to people experiencing homelessness.
AccuWeather meteorologist Brandon Buckingham said the expansive dome of high pressure will anchor itself over the central and eastern United States from this weekend through at least midweek next week, posing a risk for a multi-day stretch of heat. In addition to the heat, the dome of high pressure will help to steer a very humid airmass from the Caribbean and Gulf of America into the central and eastern United States, which will also lead to very humid conditions.
“The duration of the heatwave can become dangerous, especially for children, the elderly, construction/outdoor workers and for anyone without air conditioning,” Buckingham said in an email to The Baltimore Sun. “The daytime heat can become strenuous for anyone working or recreating outside, so it is important to stay hydrated during the upcoming stretch. Another factor increasing the potential severity of the heat wave will be the limited relief during the nighttime hours.
“Temperatures are expected to consistently stay above 70 degrees overnight which can further exacerbate any heat-related health issues.”
The Baltimore Department of Public Works activated its new Heat Illness Prevention Plan, developed in response to the death of Ronald Silver II, a 36-year-old trash collector who died of hyperthermia in August 2023.
The plan includes training on recognizing symptoms of heat-related illnesses — from heat cramps to heat stroke — and emphasizes preventative steps such as hydration and rest breaks in shaded areas. Silver had called out sick the day before his death, having experienced heat exhaustion symptoms for several days, according to a report by the city’s Office of the Inspector General.
City officials have since scrutinized DPW’s practices and are pushing for greater accountability and improved worker protections.
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