The exact quote is "Persons not heeding evacuation orders in single-family one or two story homes may face certain death,"
MAY face certain death? It's either certain or it's not.
If the idea is to get people out of danger then never mind MAY. Surely it should be "You face certain death. Get out you moron. Don't expect the rescue services to put their lives at risk to save your sorry butt."
Even then I suspect there are too many who would ignore the warning.
HM has it right. I'd have left at the first warning.