開かい花か前ぜん線せん

noun

cherry blossom front; flower front

Refers to the line connecting areas where cherry blossoms are expected to bloom on the same date, often shown on weather maps during spring.

• 今年ことしの開かい花か前ぜん線せんは平へい年ねんより早はやく北ほく上じょうしている。