This doesn't appear to be the size volcano to influence global temperatures. Volcanic activity is measured by the Volcanic Explosive Index (VEI), a nonlinear scale that takes into account volume of products, eruption cloud height, and qualitative observations.
- Mt St Helens in 1980 was about 5.
- Pinatubo in 1991 was a high 6. (That one did influence climate for a year or so).
- Tambora in 1815 was a very high 7. (It was the largest eruption in recorded history, and caused "The Year Without a Summer" in northern countries in 1816 -- or, my favorite term for it, "Eighteen hundred and froze to death.")
Here's the Twitter page for the volcano, and an updating site from the Alaska Volcano Observatory.