• Winter visitors watching geysers erupting

    Yellowstone

    National Park ID,MT,WY

Fumaroles and How They Work

A fumarole emits a jet of hot steam in Porcelain Basin.

Fumaroles, or steam vents, are the hottest hydrothermal features in the park. They have so little water that it all flashes into steam before reaching the surface. At places like Roaring Mountain, the result is a lot of hissing of steam and gases.

Black Growler Steam Vent

Norris Geyser Basin

Did You Know?