Choropleth of how a period's tornado "weight" distributes across states. Per-tornado weight mirrors the ranking pipeline in methodology; a tornado that crosses state lines counts for every state it touches, split by the track length on each side.
State weights minus the average of the same period across 30 surrounding years (15 before and 15 after mid-record; recent years backfill from earlier years to keep 30). The current year compares year-to-date against the 30 prior years, through 3 days ago. Click a state on the plotted map for its intensity distribution against the same climatology.
Cumulative national weight, day by day: the current year (through yesterday, bold red) against the 15 prior years and their day-by-day mean (bold black). Generated together with the anomaly map above. Click a year in the legend to hide it from the plot and recompute the mean without it.