There isnt any-- Airbnb is a business and their "extenuating circumstances policy" excludes hurricane exceptions. We're in the same situation and here's what Im doing to handle the cancellations :
I have found as a host that if WE cancel a booking- Airbnb will not allow us to rebook those dates again (on Airbnb) and we pay 10% fee (via Airbnb) -- and if the guest cancels the booking they pay whatever the fees/ daily penalty (in our case 50%) -- so the only people NOT being hosed in this awful situation is Airbnb- THEY TAKE THEIR CUT NO MATTER. Here's my solution as a stand-up host regardless of the fact that Airbnb doesnt value hosts enough to make exceptions-- ask the guest to cancel so that you can rebook the dates--calculate the penalty difference & refund the difference outside of the Airbnb platform (Venmo/Zelle...etc). Its the only work around I can think of so that guests arent getting screwed over because of Airbnbs inflexible policies and hosts can still rebook the dates. its a mess thats for sure and Airbnb is not equipped to handle all these issues -- so you're on your own to get creative and do the right thing by "what could have been" guests