Abstract of a journal kept at the Mauritius, of the barometrical movements during the hurricane of the 23d February, 1824

Abstract

This article presents meteorological observations, focusing on barometric pressure, recorded at an elevation of 900 feet above sea level during a severe hurricane that struck Mauritius on 23 February 1824.

Pre-Storm Conditions (Feb 18–22):

The preceding days were stormy with short gales, constant rain, and frequent thunder. However, the barometer—the sole reliable indicator of danger—was only slightly affected, never dropping more than one-tenth below its standard, and thus offered no warning of the impending catastrophe. Other signs included oppressive air, gloomy sky, clouded mountains, and heavy sea swells.

Hurricane Progression (Feb 23):

The wind increased overnight, and by 6 A.M. on the 23rd, the barometer had dropped to 28" 9', officially declaring the hurricane.

Thermal and General Observations:

• The thermometer remained remarkably steady at 73∘ throughout the entire gale.

• The greatest recorded range for the thermometer during February 1824 was 13∘.

• Other monthly statistics included 21 days of rain, 10 days of thunder/lightning, 5 rainbows, and 8 lunar rainbows.

The observations confirm the standard hurricane pattern: an initial severe gale, a significant barometric drop to the minimum pressure at the centre/eye, a temporary lull with an associated change in wind direction, followed by a second severe gale as the storm passes.