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WESTERN PACIFIC · SEASON MAP

2011 Pacific typhoon season

Every recorded track, mapped · 28 storms · 2 Apr 2011–19 Dec 2011

ACCUMULATED CYCLONE ENERGY188.5
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2011 Pacific typhoon season: every recorded storm trackRecorded tracks of all 28 storms, colored by the wind category at each observation. Hover or focus a storm in the table to highlight its track.UNITED STATESCANADAMEXICOAFRICAEUROPECHINAJAPANPHILIPPINESINDIAGulf of MexicoPacific OceanPhilippine SeaArabian SeaBay of BengalUnnamed: 2 Apr–3 Apr, peak 30 kt, Tropical depressionUnnamed: 5 Apr–5 Apr, peak 30 kt, Tropical depressionAere: 6 May–12 May, peak 50 kt, Tropical stormSongda: 19 May–29 May, peak 140 kt, Category 5Unnamed: 31 May–1 Jun, no US-agency windSarika: 8 Jun–11 Jun, peak 30 kt, Tropical depressionHaima: 16 Jun–25 Jun, peak 35 kt, Tropical stormMeari: 21 Jun–27 Jun, peak 55 kt, Tropical stormMa-On: 11 Jul–24 Jul, peak 115 kt, Category 4Tokage: 14 Jul–15 Jul, peak 30 kt, Tropical depressionNock-Ten: 24 Jul–30 Jul, peak 65 kt, Category 1Muifa: 26 Jul–9 Aug, peak 140 kt, Category 5Merbok: 3 Aug–9 Aug, peak 75 kt, Category 1Unnamed: 10 Aug–13 Aug, peak 30 kt, Tropical depressionNanmadol: 22 Aug–31 Aug, peak 140 kt, Category 5Talas: 23 Aug–5 Sep, peak 55 kt, Tropical stormNoru: 1 Sep–6 Sep, peak 45 kt, Tropical stormKulap: 6 Sep–11 Sep, peak 40 kt, Tropical stormRoke: 9 Sep–21 Sep, peak 115 kt, Category 4Sonca: 14 Sep–20 Sep, peak 90 kt, Category 2Nesat: 23 Sep–30 Sep, peak 115 kt, Category 4Haitang: 23 Sep–26 Sep, peak 35 kt, Tropical stormNalgae: 26 Sep–5 Oct, peak 130 kt, Category 4Banyan: 10 Oct–14 Oct, peak 30 kt, Tropical depressionUnnamed: 7 Nov–8 Nov, peak 25 kt, Tropical depressionUnnamed: 3 Dec–4 Dec, peak 25 kt, Tropical depressionUnnamed: 10 Dec–13 Dec, peak 25 kt, Tropical depressionWashi: 12 Dec–19 Dec, peak 50 kt, Tropical storm

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Whole season

DepressionTropical stormCat 1Cat 2Cat 3Cat 4Cat 5Post-tropical
Every storm of the 2011 Pacific typhoon season. Column headers sort the list.
Unnamed–30Tropical depression1000190
Unnamed–30Tropical depression10001,140
Aere–50Tropical storm9853,990
Songda–140Cat 59184,600
Unnamed–—Unclassified—330
Sarika–30Tropical depression1000790
Haima–35Tropical storm9932,090
Meari–55Tropical storm9822,010
Ma-On–115Cat 49375,060
Tokage–30Tropical depression1000490
Nock-Ten–65Cat 19741,730
Muifa–140Cat 59184,530
Merbok–75Cat 19672,390
Unnamed–30Tropical depression10001,530
Nanmadol–140Cat 59181,170
Talas–55Tropical storm9822,220
Noru–45Tropical storm9892,990
Kulap–40Tropical storm9931,170
Roke–115Cat 49374,200
Sonca–90Cat 29563,070
Nesat–115Cat 49372,050
Haitang–35Tropical storm996620
Nalgae–130Cat 49261,900
Banyan–30Tropical depression10001,590
Unnamed–25Tropical depression1004710
Unnamed–25Tropical depression1004250
Unnamed–25Tropical depression1004660
Washi–50Tropical storm9852,740

28 storms with an IBTrACS 2011 typhoon season record. Tracks are the archived center positions, first observation 2 Apr 2011, last 19 Dec 2011.

Tropical storms18

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

Typhoons10

64 kt or more, one-minute sustained

Major (Category 3+)7

96 kt or more, Saffir–Simpson scale

Category 53

137 kt or more at any tropical-stage observation

Strongest stormSongda

140 kt · 161 mph / 259 km/h

Lowest pressure918 hPa

Songda, 26 May 2011

Longest track record20.3 days

Ma-On, full archive record

Storms without US-agency wind1

Mapped, but outside the counts above

QUICK ANSWERS

The 2011 season in brief

How many typhoons were there in the 2011 Pacific typhoon season?

The archive records 10 typhoons (one-minute winds of 64 kt or more) among 18 tropical storms, with 7 major typhoons reaching 96 kt. Counts use US-agency winds during the tropical stage.

What was the strongest storm of the 2011 Pacific typhoon season?

Songda, with a peak one-minute sustained wind of 140 kt (Category 5) on 26 May 2011, 06:00 UTC and a minimum central pressure of 918 hPa.

How many Category 5 storms were there in 2011?

3 storms in the 2011 Pacific typhoon season reached Category 5 on the Saffir–Simpson one-minute wind scale: Songda, Muifa, Nanmadol.

When did the 2011 Pacific typhoon season start and end?

The first tropical-stage observation is on 2 Apr 2011 and the last on 19 Dec 2011, from 28 tracked storms in the archive.

What was the first typhoon of the 2011 Pacific typhoon season?

Songda, which reached typhoon strength (64 kt) on 23 May 2011, 18:00 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 Western Pacific basin for the 2011 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 typhoon 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 Western 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