First Autumn Storm

Dense saunal mist begs
dark clouds’ rumbled promises –
buckets poured gain trust.
Grass greens as we hear its thrum,
Inhaling cool autumn breeze.

Frank J. Tassone is the host of Haikai Challenge.  Frank says:
Write the haikai poem of your choice (haiku, senryu, haibun, tanka, haiga, renga, etc.) that alludes to either the first (autumn) storm (hatsu arashi), Darkness (Yami), or both!