The phrase "deadly tornado" means a very dangerous and destructive tornado that can cause severe harm and potentially lead to loss of life. Full definition
The shelter is serving as a refuge for many «families» torn apart by deadly tornadoes. (articles.orlandosentinel.com)
Here's a deeper discussion of efforts to clarify productive steps, both in science and policy, in the face of deadly tornado outbreaks, extraordinary midwestern flooding and climate change. (dotearth.blogs.nytimes.com)
December's intense storm system also caused a weeklong string of deadly tornadoes throughout states including Mississippi, Tennessee, and Texas, the likes of which haven't occurred since a 1982 El Niño. (psmag.com)