Annually the Meteorological Agency announces the coming of spring by 'the flowering dates of cherry blossoms' which are generally connected with line in a map called 'Sakura Zensen' (cherry blossom front).
例年、気象庁は、「さくらの開花予想日」と、開花予想日を線で結んだ図を発表して春の到来を知らせる（この図は一般に「桜前線」と呼ばれる）。