Waffle House was open during Hurricane Harvey in Houston. The hurricane that got stuck over us for three days and flooded the heck out of us.
I don’t think anything else was open, but Waffle House was, for a few hours a day.
There is an ‘unofficial’ Waffle House Scale that is used by some Emergency crews.
https://en.wikipedia.org/wiki/Waffle_House_Index
A Waffle House mostly reduced to rubble in Biloxi, Mississippi, after Hurricane Katrina in 2005