Warming in the eye by subsidence from near the tropopause leads to a tall column of low-density air, and hence a very low sea-level pressure, e.g. below 950 hPa [hectoPascal] in severe cyclones. The record minimum in the Australian regions is 914 hPa [hectoPascal], measured in 1899, whilst global record of 876 hPa [hectoPascal] was observed in the nortwest Pacific in 1975.