Super Typhoon Irma (1981)

Basin

Western Pacific

Dates

November 15, 1981 to November 27, 1981

Peak strength

Category 4, 135 kt (155 mph)

Lowest pressure

905 mb (26.72 inHg)

Landfall

Yes

Accumulated cyclone energy

20.5

Fastest the center moved

40 kt (46 mph)

Identifier

WP261981

The sources count different things and are not added together.

• Typhoon FredaWestern Pacific · 1981Cat 3100 kt · 945 mb
• Tropical Storm GeraldWestern Pacific · 1981Tropical Storm60 kt · 980 mb
• Tropical Depression GeraldWestern Pacific · 1981Tropical Depression
• Tropical Storm HollyWestern Pacific · 1981Tropical Storm45 kt · 996 mb
• Typhoon IkeWestern Pacific · 1981Cat 165 kt · 965 mb
• Typhoon JuneWestern Pacific · 1981Cat 175 kt · 965 mb
• Typhoon KellyWestern Pacific · 1981Cat 175 kt · 975 mb
• Tropical Storm LynnWestern Pacific · 1981Tropical Storm55 kt · 985 mb
• Tropical Storm MauryWestern Pacific · 1981Tropical Storm55 kt · 985 mb
• Unnamed tropical depressionWestern Pacific · 1981Tropical Depression
• Tropical Storm NinaWestern Pacific · 1981Tropical Storm35 kt · 992 mb
• Typhoon OgdenWestern Pacific · 1981Cat 165 kt · 975 mb
• Tropical Storm PhyllisWestern Pacific · 1981Tropical Storm55 kt · 975 mb
• Unnamed tropical stormWestern Pacific · 1981Tropical Storm40 kt · 988 mb
• Tropical Storm RoyWestern Pacific · 1981Tropical Storm50 kt · 985 mb
• Unnamed tropical depressionWestern Pacific · 1981Tropical Depression
• Tropical Storm SusanWestern Pacific · 1981Tropical Storm60 kt · 980 mb
• Tropical Storm WarrenWestern Pacific · 1981Tropical Storm45 kt · 992 mb
• Tropical Storm VanessaWestern Pacific · 1981Tropical Storm55 kt · 980 mb
• Typhoon ThadWestern Pacific · 1981Cat 285 kt · 955 mb
• Typhoon AgnesWestern Pacific · 1981Cat 295 kt · 950 mb
• Typhoon BillWestern Pacific · 1981Cat 285 kt · 960 mb
• Typhoon ClaraWestern Pacific · 1981Cat 4120 kt · 925 mb
• Typhoon DoyleWestern Pacific · 1981Cat 180 kt · 965 mb
• Unnamed tropical depressionWestern Pacific · 1981Tropical Depression
• Super Typhoon ElsieWestern Pacific · 1981Cat 5150 kt · 895 mb
• Unnamed tropical depressionWestern Pacific · 1981Tropical Depression
• Tropical Storm FabianWestern Pacific · 1981Tropical Storm45 kt · 994 mb
• Typhoon GayWestern Pacific · 1981Cat 295 kt · 950 mb
• Unnamed tropical depressionWestern Pacific · 1981Tropical Depression
• Typhoon HazenWestern Pacific · 1981Cat 3100 kt · 955 mb
• Tropical Storm JeffWestern Pacific · 1981Tropical Storm35 kt · 1000 mb
• Typhoon KitWestern Pacific · 1981Cat 4115 kt · 925 mb
• Typhoon LeeWestern Pacific · 1981Cat 295 kt · 950 mb

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.

• Wikipedia article: Typhoon Irma