Melody points me to this gem of an advisory from the NSF:
In the event of a natural or anthropogenic disaster that interferes with an organization’s ability to meet a proposal submission deadline, NSF has developed the following guidelines for use by impacted organizations. These guidelines will take the place of the previous NSF practice of posting notices to the NSF website regarding each specific event.
Flexibility in meeting announced deadline dates because of a natural or anthropogenic disasters may be granted with the prior approval of the cognizant NSF Program Officer. Proposers should contact the cognizant NSF Program Officer in the Division/Office to which they intend to submit their proposal and request authorization to submit a “late proposal.” Such contact should be via e-mail (or telephone, if e-mail is unavailable). Proposers should then follow the written or verbal guidance provided by the cognizant NSF Program Officer. Generally, NSF permits extension of the deadline by 5 business days. The Foundation, however, will work with each impacted organization on a case-by-case basis to address their specific issue(s). Proposers should be aware that all applications submitted after the submission deadline must be submitted through FastLane since Grants.gov does not accept proposals after the deadline.
Boldface mine. Yeah, read that again: you can get an extension for a natural disaster with prior approval. “Dude, Dr. Program Manager, I know there is going to be an earthquake on the day I have to submit, so could I please have an extension?”