Mount Washington is not a volcano, so it does not erupt.
the eruption that did it was a eruption
There has never been any eruption on Mount Everest, it is not a volcano.
The largest eruption in the USA was Mount St. Helen's in Washington state.
The Mount St. Helens eruption occurred in Washington state, in the western United States.
Stratovolcano
it has a stombolian eruption
Mount St. Helens in Washington state had a powerful eruption on May 18, 1980.
Mount St. Helen in Washington State in 1980. See link.
Explosive and oozy.
a pyroclastic flow
There have been a number of cases. Pyroclastic flows killed people in Herculaneum in the 79 AD eruption of Mount Vesuvius, in Ketimbang and on the Island of Sebesi in the 1883 eruption of Krakatoa, in St Pierre in the 1902 eruption of Mount Pelee, in the state of Washington in the 1980 eruption of Mount St Helens, and in Japan during the 1991 eruption of Mount Unzen.
An active strato-volcano that had an explosive eruption in May 1980.