**Traders see roughly even odds between zero and one VEI ≥4 eruption for the full year because such events remain infrequent and classification depends on precise plume height, erupted volume, and official assessments.** As of mid-September 2026, monitoring agencies report mostly moderate explosive activity at volcanoes such as Anak Krakatau, Semeru, and several Philippine and Indonesian systems, with ash columns reaching 4–15 km but limited confirmation of sustained VEI 4 criteria like >0.1 km³ dense-rock equivalent or consistently >10 km plumes. Submarine activity at sites like Titan Ridge has prompted VEI 4 speculation, yet underwater settings complicate direct measurement. Historical baselines show VEI ≥4 eruptions occur irregularly—often fewer than one per year on average—while ongoing unrest at long-active centers raises the chance of escalation before December. Key upcoming factors include revised Smithsonian/USGS or national observatory reports on plume heights and tephra volumes that could shift the count.