StEER: 10 December 2021 Midwest Tornado Outbreak Joint Preliminary Virtual Reconnaissance Report and Early Access Reconnaissance Report (PVRR-EARR)

In the late hours of 10 December and into the early hours of 11 December 2021, unseasonably warm air instigated an outbreak of at least 60 confirmed tornadoes across nine states. The outbreak included a family of damaging “Quad-State” tornadoes, with an EF4 tornado that was on the ground for over 160 miles causing devastating impacts to many small communities and in particular Mayfield, KY. This tornado outbreak is expected to be one of the largest and deadliest tornado events in US history.
Given the historic nature of this outbreak, StEER immediately issued a Level 3 response to this event, simultaneously activating its Virtual Assessment Structural Team (VAST) on 11 December, while, its Field Assessment Structural Team (FAST) was assembled to begin collecting perishable data in Mayfield and surrounding areas on 14 December. This project encompasses the products of StEER's response to this event: a joint Preliminary Virtual Reconnaissance Report-Early Access Reconnaissance Report (PVRR-EARR) and Curated Dataset.