I hiked Sierra Negra in summer 2019, less than a year after the eruption. Of course, it could be pure hindsight, but the tour guide said that the 2018 eruption

I hiked Sierra Negra in summer 2019, less than a year after the eruption. Of course, it could be pure hindsight, but the tour guide said that the 2018 eruption was anticipated by observable signs, and that our group was safe because there would be many signs before the next eruption. I wish I knew about this model at the time so I could have asked a question or two.