I just hope the wind doesn't get any stronger!

Literal

Wind [subject-が] strong become-only not-[wish-ば] good [exclamation-ですよ]!

~さえしなければいいですよ means 'if only X doesn't happen, I'd be happy.' さえ (even/just) + しなければ (if not done) + いい (good). Expresses anxious hope.