Hurricane Ilsa (1975)

Basin

Eastern Pacific

Dates

August 18, 1975 to August 26, 1975

Peak strength

Category 2, 90 kt (104 mph)

Landfall

No; closest approach 366 km (227 mi)

Accumulated cyclone energy

16.7

Fastest the center moved

18 kt (21 mph)

Identifier

EP091975

No source this site reads publishes a machine-readable casualty or damage figure for a storm of this era. The National Hurricane Center’s season tables begin in 1995 and carry deaths and damage only from 2005 in the Atlantic and 2020 in both basins; the US Storm Events record begins in 1996.

• Hurricane AgathaEastern Pacific · 1975Cat 170 kt · 1005 mb
• Tropical Storm BridgetEastern Pacific · 1975Tropical Storm55 kt
• Hurricane CarlottaEastern Pacific · 1975Cat 3110 kt
• Unnamed tropical depressionEastern Pacific · 1975Tropical Depression25 kt
• Hurricane DeniseEastern Pacific · 1975Cat 4120 kt
• Tropical Storm EleanorEastern Pacific · 1975Tropical Storm35 kt
• Tropical Storm FranceneEastern Pacific · 1975Tropical Storm45 kt
• Tropical Storm GeorgetteEastern Pacific · 1975Tropical Storm40 kt
• Tropical Storm HilaryEastern Pacific · 1975Tropical Storm50 kt
• Hurricane JewelEastern Pacific · 1975Cat 165 kt
• Hurricane KatrinaEastern Pacific · 1975Cat 4115 kt
• Unnamed hurricaneEastern Pacific · 1975Cat 165 kt · 990 mb
• Unnamed tropical depressionEastern Pacific · 1975Tropical Depression30 kt
• Hurricane LilyEastern Pacific · 1975Cat 175 kt
• Tropical Storm MonicaEastern Pacific · 1975Tropical Storm45 kt
• Tropical Storm NanetteEastern Pacific · 1975Tropical Storm45 kt
• Unnamed tropical depressionEastern Pacific · 1975Tropical Depression25 kt
• Hurricane OliviaEastern Pacific · 1975Cat 3100 kt
• Unnamed tropical depressionEastern Pacific · 1975Tropical Depression25 kt
• Tropical Storm PriscillaEastern Pacific · 1975Tropical Storm55 kt

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.

The National Hurricane Center has published no tropical cyclone report for this storm.