Kyō mireba Arashi no yama wa Ōigawa momiji fukiorosu na ni koso arikere - Senzai Wakashu(English Translation & Meaning)

今日見れば嵐の山は大井川
紅葉吹きおろす名にこそありけれ

Roma-ji: Kyō mireba Arashi no yama wa Ōigawa momiji fukiorosu na ni koso arikere
English Translation: Seeing it today,
the Storm Mountain, I find,
by the Ōi River
blows the autumn leaves down:
that is what its name means
Meaning: Seeing it today, I find that Storm Mountain is named for the storm that blows its autumn leaves down into the Ōi River.
Commentary: Book Five Autumn Poems II 370

Headnote: "Composed on going to view autumn leaves at the Ōi River"
Composed on going to view the autumn leaves at the Ōi River. Seeing it for himself today, the poet says, he found that the name Arashiyama, Storm Mountain, came from the storm that blows the autumn leaves down into the Ōi River. Witnessing the leaves blown from the mountain into the river, he conveys the splendor of the scene in the form of discovering the origin of a place name.
The author, "Shun'e Hōshi," was the son of Minamoto no Toshiyori. A monk of Tōdaiji, he named his quarters at Shirakawa in the capital the Karin'en, the Poetry Grove, and made it a gathering place for many poets. A poem of his is included in the Ogura Hyakunin Isshu.
The next poem, 371, was composed at the Ōi River on the same occasion, singing of the storm on the peak and the flowing river luring the leaves. 372 of this book likewise finds the origin of the name Tamuke Mountain in the autumn leaves and closes with "na koso arikere," answering this poem.

First line, "kyō mireba": "seeing it today," the occasion of discovery.
Second line, "Arashi no yama wa": Arashiyama in Yamashiro, reading the origin of the name in the character for "storm." It answers "mine no arashi" in the next poem, 371.
Third line, "Ōigawa": a river in Yamashiro that flows at the foot of Arashiyama. The next poem, 371, sings of the same river.
Fourth line, "momiji fukiorosu": a hypermetric line of eight syllables, the storm blowing the leaves down from the mountain into the river.
Fifth line, "na ni koso arikere": "koso" closes with the perfective form "kere." "Keri" expresses realization, "that was the name," showing the discovery of the name's origin. It answers the last line of 372, "na koso arikere."
Author: Shun'e
Source: Senzai Wakashu
Prev Poem: Niwa no omo ni chirite tsumoreru momijiba wa kokonoe ni shiku nishiki narikeri
Next Poem: Ōigawa nagarete otsuru momiji kana sasou wa mine no arashi nomi ka wa