If you expect trouble for an upcoming event or want to verify past planned riots or FF's. The Satellite weather archives displays is a great tool to find and verify what you are looking for. The Satellite weather archives will display dense ChemTrails coverage, not just the weather. If you see that level of ChemTrails coverage it is likely there will be a problem or verify what was in an area of concern.
Notable FF's (Sandy Hook, Boston, etc) and others, and riots (Portland etc). All had dense ChemTrails during those events. Spanning miles around the area of concern.