noun
westerly wind around the spring equinox
A seasonal wind that blows from the west around the time of the spring equinox (彼岸). Used in weather and traditional contexts.
彼岸西風が吹くと、春の訪れを感じる。
When the westerly wind blows around the spring equinox, I feel the arrival of spring.
Compound of 彼岸 (spring equinox) and 西風 (westerly wind). The exact historical derivation is uncertain, but the term describes a wind pattern associated with the equinoctial period.