暖波(だんぱ)

Composed of 暖(だん) (warm) and 波(は) (wave). Formed as the direct antonym of 寒波(かんぱ) (cold wave), though it is far less common than its opposite because Japan's winters more often make news for cold snaps.

Usage

A meteorological term used in weather forecasts, newspaper weather columns, and climate-change discussions. It refers specifically to unseasonably warm air masses — typically in winter or early spring. For a hot spell in the middle of summer, 熱波(ねっぱ) is the usual word. In casual conversation people simply say 暖(あたた)かい日(ひ)が続(つづ)く (warm days continue) rather than using 暖波(だんぱ).

Common collocations

• 暖波(だんぱ)が到来(とうらい)する: a warm spell arrives
• 暖波(だんぱ)が流(なが)れ込(こ)む: a warm spell flows in
• 記録的(きろくてき)な暖波(だんぱ): a record-breaking warm spell
• 暖波(だんぱ)の影響(えいきょう): the influence of a warm spell

Similar words

• 寒波(かんぱ): cold wave — the direct antonym, much more frequently used
• 熱波(ねっぱ): heat wave — the word for extreme heat, especially a deadly summer heat wave
• 暖冬(だんとう): warm winter — describes a whole season, not a short-term event
• 異常気象(いじょうきしょう): abnormal weather — a broader term that may include warm spells among other anomalies