precipitable water

uncountable

The amount of water vapour, in a column of air, that is equivalent to the depth of the liquid water that would be obtained if it fell as rain

Japanese Meaning

大気中のある空気柱に含まれる水蒸気の量。もしこの水蒸気が降雨となって液体の水に変わった場合に得られる水の深さに相当する量。

The satellite data showed unusually high precipitable water over the coastal region, signaling a potential for heavy rainfall.

衛星データは沿岸地域で異常に高い降水換算水蒸気量を示しており、激しい降雨の可能性を示唆していた。

Sense（1）

The amount of water vapour, in a column of air, that is equivalent to the depth of the liquid water that would be obtained if it fell as rain