hurricanesmapped

EASTERN PACIFIC · SEASON MAP

1970 Pacific hurricane season

Every recorded track, mapped · 18 storms · 30 May 1970–6 Nov 1970

ACCUMULATED CYCLONE ENERGY74.5
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1970 Pacific hurricane season: every recorded storm trackRecorded tracks of all 18 storms, colored by the wind category at each observation. Hover or focus a storm in the table to highlight its track.UNITED STATESMEXICOCUBACHINAJAPANPHILIPPINESINDIAGulf of MexicoAtlantic OceanPacific OceanPhilippine SeaArabian SeaBay of BengalAdele: 30 May–6 Jun, peak 75 kt, Category 1Blanca: 10 Jun–11 Jun, peak 50 kt, Tropical stormConnie: 17 Jun–20 Jun, peak 45 kt, Tropical stormEileen: 26 Jun–30 Jun, peak 40 kt, Tropical stormFrancesca: 1 Jul–8 Jul, peak 85 kt, Category 2Gretchen: 14 Jul–20 Jul, peak 45 kt, Tropical stormHelga: 16 Jul–19 Jul, peak 50 kt, Tropical stormIone: 22 Jul–25 Jul, peak 45 kt, Tropical stormIone: 24 Jul–24 Jul, peak 50 kt, Tropical stormJoyce: 29 Jul–1 Aug, peak 50 kt, Tropical stormKristen: 5 Aug–7 Aug, peak 45 kt, Tropical stormLorraine: 16 Aug–26 Aug, peak 85 kt, Category 2Maggie: 20 Aug–26 Aug, peak 50 kt, Tropical stormNorma: 31 Aug–6 Sep, peak 50 kt, Tropical stormOrlene: 7 Sep–9 Sep, peak 55 kt, Tropical stormPatricia: 4 Oct–10 Oct, peak 95 kt, Category 2Rosalie: 21 Oct–23 Oct, peak 45 kt, Tropical stormSelma: 1 Nov–6 Nov, peak 60 kt, Tropical storm

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Whole season

DepressionTropical stormCat 1Cat 2Cat 3Cat 4Cat 5Post-tropical
Every storm of the 1970 Pacific hurricane season. Column headers sort the list.
Adele–75Cat 1—1,950
Blanca–50Tropical storm—200
Connie–45Tropical storm—510
Eileen–40Tropical storm—740
Francesca–85Cat 29912,180
Gretchen–45Tropical storm1009870
Helga–50Tropical storm—580
Ione–45Tropical storm—960
Ione–50Tropical storm—180
Joyce–50Tropical storm—960
Kristen–45Tropical storm—910
Lorraine–85Cat 29632,790
Maggie–50Tropical storm—1,700
Norma–50Tropical storm9921,030
Orlene–55Tropical storm—310
Patricia–95Cat 29722,080
Rosalie–45Tropical storm1006520
Selma–60Tropical storm995970

18 storms with an IBTrACS 1970 hurricane season record. Tracks are the archived center positions, first observation 30 May 1970, last 6 Nov 1970.

Tropical storms18

Tropical-stage US-agency wind of 34 kt or more

Hurricanes4

64 kt or more, one-minute sustained

Major (Category 3+)0

96 kt or more, Saffir–Simpson scale

Category 50

137 kt or more at any tropical-stage observation

Strongest stormPatricia

95 kt · 109 mph / 176 km/h

Lowest pressure963 hPa

Lorraine, 22 Aug 1970

Longest track record11.5 days

Lorraine, full archive record

Storms without US-agency wind0

Mapped, but outside the counts above

QUICK ANSWERS

The 1970 season in brief

How many hurricanes were there in the 1970 Pacific hurricane season?

The archive records 4 hurricanes (one-minute winds of 64 kt or more) among 18 tropical storms, with 0 major hurricanes reaching 96 kt. Counts use US-agency winds during the tropical stage.

What was the strongest storm of the 1970 Pacific hurricane season?

Patricia, with a peak one-minute sustained wind of 95 kt (Category 2) on 8 Oct 1970, 18:00 UTC and a minimum central pressure of 972 hPa.

How many Category 5 storms were there in 1970?

None. No storm in the 1970 Pacific hurricane season reached Category 5 on the Saffir–Simpson one-minute wind scale in the archive.

When did the 1970 Pacific hurricane season start and end?

The first tropical-stage observation is on 30 May 1970 and the last on 6 Nov 1970, from 18 tracked storms in the archive.

What was the first hurricane of the 1970 Pacific hurricane season?

Adele, which reached hurricane strength (64 kt) on 1 Jun 1970, 00:00 UTC.

METHODOLOGY

Data sources and limitations

The map and totals are generated from NOAA’s IBTrACS v04r01 archive. A storm belongs to this page when the archive lists it in the Eastern Pacific basin for the 1970 season, so a December storm whose track ends in January stays with its season. Storms that cross between basins appear on the page of their archive basin only.

Counts use US-agency one-minute winds during the tropical stage: 34 kt for a tropical storm, 64 kt for hurricane strength and 96 kt for major intensity, on the Saffir–Simpson scale in every basin. Local agencies classify storms differently, and official season summaries can differ from the archive. Accumulated cyclone energy sums squared winds at six-hourly synoptic times, counting observations in the calendar year. Storms with no US-agency wind are mapped but cannot enter the counts.

The map frame is the same for every Eastern Pacific season, so a track that leaves it is cut at the edge. Lines show each storm’s center, not its size, rainfall or flood extent. Coastlines use Natural Earth’s 1:10m land data.

Archive retrieved

NOAA IBTrACS archive · Field documentation

Sources & methodology