Morning Geyser of the Lower Geyser Basin in Yellowstone National Park. Morning Geyser reactivated in 2012 to the delight of many after an 18-year dormancy. It is rare for Morning Geyser to erupt, but it has been active on and off for the past year (2013). Although Morning Geyser seldom erupts, when it does it is one of the park's largest geysers. It erupts in bursts 150-200 feet high and 60-100 feet wide.
It received the name “Morning” because it usually erupts in the morning hours, when the wind is calm. Morning Geyser erupts from a large pool of water that rises and lowers which makes the large surface of the pool susceptible to wind effecting surface temperature of it’s water