Hurricane Sandy caused dreadful problems, some of which are still around, when it hit America. Dialysis patients had some extra problems.
Clinics needed to use generators when their patients turned up, but those on home dialysis had problems with the power outage as well, as explained in this video report from EverydayHealth.
With winter approaching we strongly recommend you read this article on preparing yourself for problems in bad weather. It has some good advice which should help disaster proof the lives of those on dialysis.