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Unexpected dynamic phenomena have surprised solar system observers in thepast and have led to important discoveries about solar system workings.Observations at the initial stages of these events provide crucial informationon the physical processes at work. We advocate for long-term/permanent programson ground-based and space-based telescopes of all sizes - including ExtremelyLarge Telescopes (ELTs) - to conduct observations of high-priority dynamicphenomena, based on a predefined set of triggering conditions. These programswill ensure that the best initial dataset of the triggering event are taken;separate additional observing programs will be required to study the temporalevolution of these phenomena. While not a comprehensive list, the following arenotional examples of phenomena that are rare, that cannot be anticipated, andthat provide high-impact advances to our understandings of planetary processes.Examples include: new cryovolcanic eruptions or plumes on ocean worlds; impactson Jupiter, Saturn, Uranus, or Neptune; extreme eruptions on Io; convectivesuperstorms on Saturn, Uranus, or Neptune; collisions within the asteroid beltor other small-body populations; discovery of an interstellar object passingthrough our solar system (e.g. 'Oumuamua); and responses of planetaryatmospheres to major solar flares or coronal mass ejections.

Astro2020 Science White Paper: Triggered High-Priority Observations of Dynamic Solar System Phenomena