All installations I have been involved with are structurally engineered to meet wind loading and snow loading for the region they are installed. More secure than most structures built in prior years.
Wind ratings on the panels themselves vary from 130 to 160 mph depending on the brand. If panels are installed to local codes they are going to stay on thier mounts.
In Florida they are required to be rated for hurricane force winds in some juristictions
Only in 1.1 % of tornados (EF4 to EF5) would you need to be concerned with panels leaving thier mounting brackets, well unless they are not installed to code.
information below was copied and pasted from the attached link.
Across all of history, weak F/EF0 and F/EF1 tornadoes have comprised about 80 percent of all twisters. F/EF2 make up about 14 percent, F/EF3 roughly four percent, F/EF4 nearly one percent, and F/EF5 a miniscule 0.1 percent. As we saw in an examination of
violent tornadoes, 63 percent of all fatalities have been caused by that one percent of F/EF4 and F/EF5 events.
Well over 1,000 tornadoes of all sizes and strengths touch down across the country each year.
www.ustornadoes.com
Not playing down the danger of a tornado as the destruction can be devastating.