Eighty million Americans from the central Plains to New England are under some form of heat advisory or excessive heat warning as of June 18–19, 2026, as a dangerous and widespread heat event stretches across the country — hitting during the Juneteenth holiday weekend and drawing emergency declarations from governors and mayors across the affected region.
New York Governor Kathy Hochul activated the state's Emergency Operations Center on June 18, putting the entire statewide heat response apparatus on active deployment. In language that reflects the scale of the public health risk, she was direct: "This is a deadly event. We have seen blizzards, we have seen flooding, we had hurricanes, we had tornadoes. But this heat event is most likely to cause more deaths."
