Hurricane Irwin (2011)

Basin

Eastern Pacific

Dates

October 4, 2011 to October 18, 2011

Peak strength

Category 2, 85 kt (98 mph)

Lowest pressure

976 mb (28.82 inHg)

Landfall

No; closest approach 154 km (96 mi)

Accumulated cyclone energy

8.4

Tropical-storm-force wind reached

90 nmi (167 km, 104 mi) from the center at its widest

Hurricane-force wind reached

15 nmi (28 km, 17 mi) from the center at its widest

Eyewall radius at its peak

15 nmi (28 km, 17 mi)

Overall size

200 nmi (370 km, 230 mi) to the outermost closed isobar

Peak gust in the best track

100 kt (115 mph)

Fastest the center moved

15 kt (17 mph)

Identifier

EP112011

No source this site reads carries a casualty or damage figure for this storm.

• Hurricane AdrianEastern Pacific · 2011Cat 4120 kt · 944 mb
• Hurricane BeatrizEastern Pacific · 2011Cat 180 kt · 977 mb
• Hurricane CalvinEastern Pacific · 2011Cat 170 kt · 984 mb
• Hurricane DoraEastern Pacific · 2011Cat 4135 kt · 929 mb
• Hurricane EugeneEastern Pacific · 2011Cat 4120 kt · 942 mb
• Tropical Storm FernandaEastern Pacific · 2011Tropical Storm60 kt · 992 mb
• Hurricane GregEastern Pacific · 2011Cat 175 kt · 979 mb
• Unnamed tropical depressionEastern Pacific · 2011Tropical Depression30 kt · 1002 mb
• Hurricane HilaryEastern Pacific · 2011Cat 4125 kt · 942 mb
• Hurricane JovaEastern Pacific · 2011Cat 3110 kt · 955 mb
• Unnamed tropical depressionEastern Pacific · 2011Tropical Depression30 kt · 1004 mb
• Hurricane KennethEastern Pacific · 2011Cat 4125 kt · 940 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.

• Tropical cyclone report, National Hurricane Center
• Every advisory and discussion NHC issued while it was live
• Best track as KMZ, National Hurricane Center