Summary of multiple simultaneous severe weather events and probability of an 8+ hour power outage co-occurring on the same county-day from 2018–2020.

Results are on the 1,657 counties with 3 years of reliable power outage data (1,799,208 total county-days). Proportion of county-days with multiple simultaneous severe weather events are relative to 1,799,208 county-days in the study. Only multiple simultaneous severe weather combinations observed in the data are presented.