Hurricane History Map

1970 Eastern and central Pacific season

20 storms formed in the Eastern and central Pacific basin in 1970, from 30 May 1970 to 8 November 1970.

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Years1970
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 1970 season in numbers

The record holds 20 storms for the 1970 Eastern and central Pacific season, of which 20 had names.20 reached tropical storm strength (34 knots or more), 5 reached hurricane strength (category 1 or more) and 0 were major (category 3 or more).

  • 20storms
  • 20tropical storm strength or more
  • 5hurricane strength or more
  • 0major (category 3 to 5)
  • 80accumulated 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 1970

  • Patricia (1970)4 October 1970 to 11 October 1970, peak Category 2 (95 kt), 972 hPa
  • Francesca (1970)1 July 1970 to 10 July 1970, peak Category 2 (85 kt), 991 hPa
  • Lorraine (1970)16 August 1970 to 27 August 1970, peak Category 2 (85 kt), 963 hPa
  • Adele (1970)30 May 1970 to 7 June 1970, peak Category 1 (75 kt)
  • Dot (1970)1 September 1970 to 4 September 1970, peak Category 1 (70 kt)

All 20 storms of 1970

StormPeak
Adele Category 1
Blanca Tropical storm
Connie Tropical storm
Eileen Tropical storm
Francesca Category 2
Gretchen Tropical storm
Helga Tropical storm
Ione Tropical storm
Ione Tropical storm
Joyce Tropical storm
Therese Tropical storm
Kristen Tropical storm
Lorraine Category 2
Maggie Tropical storm
Norma Tropical storm
Dot Category 1
Orlene Tropical storm
Patricia Category 2
Rosalie Tropical storm
Selma Tropical storm

← 1969 · 1971 → · All seasons

Other basins in 1970

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