Hurricane History Map

1870 North Atlantic season

15 storms formed in the North Atlantic basin in 1870, from 29 July 1870 to 26 November 1870.

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Years1870
Ocean basin

Choosing a minimum category hides storms with no wind speed in the record. To see which storms have passed near you, search a town or ZIP code, or tap the map.

Key
  • Tropical depression Winds below 34 knots (39 mph)
  • Tropical storm 34 to 63 knots (39 to 73 mph)
  • Category 1 64 to 82 knots (74 to 95 mph)
  • Category 2 83 to 95 knots (96 to 110 mph)
  • Category 3 96 to 112 knots (111 to 129 mph), major
  • Category 4 113 to 136 knots (130 to 156 mph), major
  • Category 5 137 knots (157 mph) or more, major
  • Unknown intensity No wind speed in the record
  • Post-tropical Storm has become post-tropical (dashed line)

How to read the lines. Each line is the track of one storm, drawn through its six-hourly positions and coloured by its intensity at each point (the Saffir-Simpson scale), so a line changes colour as the storm strengthens or weakens. Tap a line for its details, or tap anywhere else to see which storms have passed nearby. Weaker storms appear as you zoom in. Hurricanes, typhoons and cyclones are the same kind of storm with different names in different oceans.

The 1870 season in numbers

The record holds 15 storms for the 1870 North Atlantic season, of which 0 had names.9 reached tropical storm strength (34 knots or more), 9 reached hurricane strength (category 1 or more) and 2 were major (category 3 or more). 6 have no wind speed in the record.

  • 15storms
  • 9tropical storm strength or more
  • 9hurricane strength or more
  • 2major (category 3 to 5)
  • 90accumulated cyclone energy

Accumulated cyclone energy adds up the squared wind speed of every position of 34 knots or more, divided by 10,000. It is approximate here because the winds are 1-minute equivalents, and it is mostly useful for comparing seasons of one basin.

Strongest storms of 1870

  • Unnamed storm of August 1870 (North Atlantic)29 August 1870 to 13 September 1870, peak Category 3 (110 kt), 948 hPa
  • Unnamed storm of October 1870 (North Atlantic)5 October 1870 to 18 October 1870, peak Category 3 (100 kt), 959 hPa
  • Unnamed storm of August 1870 (North Atlantic)25 August 1870 to 5 September 1870, peak Category 2 (90 kt)
  • Unnamed storm of October 1870 (North Atlantic)17 October 1870 to 22 October 1870, peak Category 2 (90 kt)
  • Unnamed storm of October 1870 (North Atlantic)22 October 1870 to 24 October 1870, peak Category 2 (90 kt)

All 15 storms of 1870

StormPeak
Unnamed storm Category 1
Unnamed storm Unknown intensity
Unnamed storm Category 2
Unnamed storm Category 3
Unnamed storm Unknown intensity
Unnamed storm Category 1
Unnamed storm Unknown intensity
Unnamed storm Category 3
Unnamed storm Category 1
Unnamed storm Category 2
Unnamed storm Category 2
Unnamed storm Unknown intensity
Unnamed storm Category 1
Unnamed storm Unknown intensity
Unnamed storm Unknown intensity

← 1869 · 1871 → · All seasons

Other basins in 1870

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