Unnamed hurricane (1870)

Basin

North Atlantic

Dates

August 29, 1870 to September 13, 1870

Peak strength

Category 3, 110 kt (127 mph)

Lowest pressure

948 mb (27.99 inHg)

Landfall

No; closest approach 491 km (305 mi)

Accumulated cyclone energy

18.6

Identifier

AL031870

No source this site reads publishes a machine-readable casualty or damage figure for a storm of this era. The National Hurricane Center’s season tables begin in 1995 and carry deaths and damage only from 2005 in the Atlantic and 2020 in both basins; the US Storm Events record begins in 1996.

• Unnamed hurricaneNorth Atlantic · 1870Cat 170 kt
• Unnamed tropical depressionNorth Atlantic · 1870Tropical Depression
• Unnamed hurricaneNorth Atlantic · 1870Cat 290 kt
• Unnamed tropical depressionNorth Atlantic · 1870Tropical Depression
• Unnamed hurricaneNorth Atlantic · 1870Cat 180 kt · 969 mb
• Unnamed tropical depressionNorth Atlantic · 1870Tropical Depression
• Unnamed hurricaneNorth Atlantic · 1870Cat 3100 kt · 959 mb
• Unnamed hurricaneNorth Atlantic · 1870Cat 170 kt
• Unnamed hurricaneNorth Atlantic · 1870Cat 290 kt
• Unnamed hurricaneNorth Atlantic · 1870Cat 290 kt
• Unnamed tropical depressionNorth Atlantic · 1870Tropical Depression
• Unnamed hurricaneNorth Atlantic · 1870Cat 170 kt
• Unnamed tropical depressionNorth Atlantic · 1870Tropical Depression
• Unnamed tropical depressionNorth Atlantic · 1870Tropical Depression

A best track is the record a warning agency settles on after the storm, not what it said at the time: position, maximum sustained wind and central pressure every six hours, revised against every observation that came in later. Category is the Saffir-Simpson scale, which runs from Category 1 at 64 kt to Category 5 at 137 kt and reads wind only, so it says nothing about surge or rain. Accumulated cyclone energy adds up the square of the wind through the storm's life, so it counts strength and duration together.

Storm history from NOAA NCEI’s International Best Track Archive for Climate Stewardship (IBTrACS), which merges the official best track of every warning agency. Live storms, cones, watches and warnings from the National Hurricane Center and the Central Pacific Hurricane Center. Archived radar from NOAA’s Level II archive.

The National Hurricane Center has published no tropical cyclone report for this storm.