Idea 1: Over-achieving Nankai quake (something like a M9.5 or M9.6 instead of the expected M9.2 or M9.3) Idea 2: Combination American EAS/Japanese EEW/J-Alert for a Cascadia Megaquake/tsunami (like the one from January 26, 1700) Idea 3: Megatyphoon (minimum pressure of 835mb, similar to that seen in ForceThirteen's 2020 What-Might-Have-Been Pacific Typhoon video) Idea 4: Asteroid 99942 Apophis