I'm drawing a blank on how to translate the joke here, what with it depending on multiple possible meanings of いっか.

台風一過 - clear weather after a typhoon
台風一家 - Typhoon Family
and plus one at the end
まぁいっか - Well, whatever.

Wait, is this Hoppo's first typhoon? You'd think she'd knew of such things by now....

*Bump for trans*

Steak said:

*Bump for trans*

What he said