From the Ready.gov nuclear explosion page:
An official website of the United States government Here's How You Know
Official websites use .gov
A .gov website belongs to an official government organization
A .gov website belongs to an official government organization
in the United States.
Nuclear explosions can cause significant damage and casualties from blast, heat, and radiation but you can keep your family safe by knowing what to do and being prepared if it occurs....
...Go to the basement or middle of the building. Stay away from the outer walls and roof. Try to maintain a distance of at least six feet between yourself and people who are not part of your household. If possible, wear a mask if you’re sheltering with people who are not a part of your household. Children under two years old, people who have trouble breathing, and those who are unable to remove masks on their own should not wear them....
....MUCH MORE
Roger that, maintain masking and social distancing, over.
