The celebration of thunder or storms in this stanza emphasizes the fact that

the navajo live in the dry arizona deserts.
the navajo live in the lush forests of oregon.
the navajo live on the sunny coasts of california.
the navajo live on the fertile prairies of nebraska

Refute it, showing why it is mistaken—an apparent but not real problem; acknowledge its validity or plausibility, but suggest why on balance it's relatively less important or less likely than what you propose, and thus doesn't overturn it; concede its force and complicate your idea accordingly—restate your thesis in a more exact, qualified, or nuanced way that takes account of the objection, or start a new section in which you consider your topic in light of it. this will work if the counterargument concerns only an aspect of your argument; if it undermines your whole case, you need a new thesis.