1864 Calcutta cyclone

On 5 October 1864, most of the areas of Calcutta (present-day Kolkata), India was inundated and destroyed by a tropical cyclone.

[1] Moneka, a ship to the west of the Andamans, experienced "dark, rainy, squally weather and west-southwestward winds, with a low barometer amount" on 1 October.

[1] By afternoon, the sky looked very black and lowering (possibly referring to the barometer count) and the seas were rising.

[1] From observations in Port Blair and the ship Moneka, the vortex of the cyclone formed on the afternoon of 2 October.

[1] Another ship, dubbed Conflict' experienced light variable winds from west-northwest and north-northwest, starting from the sunrise of October 2.

[1] From midnight of 2 to 10 October am of the next day, the ship Moneka experienced a fresh breeze to the west while a very black sky is observed to the north.

[1] Another ship named Wayfarer which was bound for Calcutta had experienced strong breeze and deluge of rains on 2 and 3 October.

[1] Starting on 4 October, heavy rains and gusty winds impacted the shores of Calcutta and the nearby East Bengal.

[1] The cyclone moved north-northeast and is believed to be dissipated on 7 October, inland, possibly near or on East Bengal (present-day Bangladesh).

[1] At exactly 14:30 UTC (10:00 pm IST) on 5 October, as conditions calmed, some employees of the factory near the coast of Calcutta went outside to observe, founding that many trees were uprooted, kutcha houses destroyed and boats sunk.