hectopascal - equivalent to a millibar (q.v.). An attempt to use SI units without doing away with the idea of millibars (from the c.g.s. system). [ 1 hPa=100 Pa (or N/m2)]
HPA
Meaning of HPA in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012