A milky-blue thermal pool has emerged in Yellowstone’s Norris Geyser Basin, forming through a series of small hydrothermal bursts between December 2024 and February 2025. Park geologists discovered this 4-meter (13-foot) feature during routine maintenance visits on April 10, 2025. Located in the Porcelain Basin area, the pool sits immediately west of a vegetation patch known locally as “Tree Island.” Its light blue water, heated to 43°C (109°F), rests about 30 centimeters (1 foot) below the rim. Scattered rocks up to 30 centimeters across, coated with light-gray silica mud, surround the pool’s edge – evidence of the mild explosions that … Continue reading New Blue Pool at Yellowstone’s Norris Basin Born Christmas Day Without Major Eruption