FORT WAYNE, Ind. (WFFT) — 40 years ago on May 18th, Mount St. Helens erupted.
It became the most destructive eruption in U.S. history, according to the United States Geological Service.
57 people were killed, including one USGS scientist.
The eruption began at 9:20 a.m. Pacific time and lasted 9 hours.
540 million tons of ash from the volcano fell over 22 thousand square miles.
That is roughly equal to a football field having 150 miles of ash dumped on top of it.
After the eruption, it took about 36 hours for the ash cloud to diffuse into the sky over northeastern Indiana.
According to the USGS, the ash had drifted around the world for 2 weeks.
Before the eruption, the volcano was 9,677 feet high. That made it the 5th highest peak in Washington State.
Since the eruption, which took out part of the crater, the volcano soars up to 8,365 feet.
If you want to learn more about the eruption and how things have changed since, you can here.