Heat Dome
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NASA
Summer Goes Out With a Heat Dome
While the calendar indicated that astronomical summer was winding down, a swath of the south-central United States was sweltering under a heat dome in mid-September 2026. This map shows air temperatures in the contiguous U.S. on September 15, 2026, at 4 p.m. Central Time (21:00 Universal Time), modeled at 2 meters (6.5 feet) above the ground. It was produced by…
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NASA
Heat Dome Broils the Western U.S.
It’s still relatively early in the summer season in the Northern Hemisphere, but several parts of North America were sweltering in mid-July. The latest purveyor of heat was a strong ridge of high pressure that lingered in the upper atmosphere over the northern Rockies on the weekend of July 11-12, 2026. This pushed hot air toward the surface and trapped it there—a weather phenomenon meteorologists call…
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