Prepare for the coming flood
Why does everyone talk about "the storm" that's coming? You can only hide and take shelter during a storm.
But a flood, you can be above the flood. You can surpass the flood, you can leave the surface world behind, in all its destruction.
Perhaps this is a rhetorical trick employed by the enemy? A storm cannot be escaped, a flood can be escaped. A storm makes humans into little bugs hiding from some horrible thing, a flood allows humanity to "rise above"
We see through the rhetorical tricks