A brutal heatwave continues to bake the northeastern United States, with major cities like New
York, Boston, and Philadelphia seeing temperatures soar past the 100-degree mark on June 24—
just days after the official start of summer.
Temperatures at New York’s John F. Kennedy Airport reached triple digits for the first time
since 2013. Philadelphia and Boston recorded similar highs shortly thereafter, while even parts
of Maine experienced the intense heat.
The National Weather Service (NWS) reported that nearly 40 heat records were either tied or
broken just one day earlier. Forecasters say the sweltering conditions are expected to persist
through the weekend.
“Heat advisories are in effect for portions of the Midwest, South, Southeast, and East Coast, and
extreme heat warnings are in effect for portions of the Ohio Valley and Mid-Atlantic,” said the
Weather Prediction Center on June 25.
“Extreme heat will linger in the Ohio Valley through the end of the work week, with high
temperatures in the 90s and lows in the 70s each day, but temperatures elsewhere should begin to
moderate by Thursday night,” the Center added.
Health officials are sounding the alarm over the risks of prolonged exposure. The Weather
Prediction Center emphasized the dangers of dehydration and insufficient cooling, warning that
long-term heat exposure can result in conditions such as heat exhaustion and heat stroke.
In addition to the extreme heat, storm activity is becoming a growing concern.
“With extremely warm, moist, unstable air in place across most of the Central and Eastern U.S.,
some thunderstorm activity may become severe,” the Center warned. “Scattered severe
thunderstorms with damaging winds are expected to develop this evening across the Southwest,
Plains, and Upper Midwest.”
On June 25, the NWS’s experimental heat risk index flagged much of the Mid-Atlantic and Ohio
Valley as being at “extreme risk” for heat-related impacts over the next 24 hours.
“This level of rare and/or long-duration extreme heat with little to no overnight relief affects
anyone without effective cooling and/or adequate hydration,” the agency warned. “Impacts likely
in most health systems, heat-sensitive industries, and infrastructure.”
A broader region remains under alert for a “major risk” of heat-related consequences.
According to data from the National Oceanic and Atmospheric Administration (NOAA), average
daytime summer temperatures in the U.S. have risen by approximately 2.2 degrees Fahrenheit
since 1970. Nighttime temperatures have climbed even more—by about 2.6 degrees—due in part
to rising humidity and the heat-retaining effects of urban landscapes.
That lingering nighttime warmth has intensified the heatwave’s impact.
“You get the combination of the extreme heat and humidity but no relief,” said Jacob Asherman,
a meteorologist at NOAA’s Weather Prediction Center. “It’s kind of been just everything stacked
on top of itself … It just speaks to how strong this heat wave is. This is a pretty, pretty extreme
event.”