Tropical Storm Penny (1975)

Basin

South Indian

Dates

November 6, 1974 to November 16, 1974

Peak strength

Tropical Storm, 60 kt (69 mph), ten-minute wind

Lowest pressure

981 mb (28.97 inHg)

Landfall

No; closest approach 500 km (311 mi)

Accumulated cyclone energy

4.2

Identifier

1974311S06097

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.

• Tropical Storm MarciaSouth Indian · 1975Tropical Storm50 kt · 988 mb
• Tropical Storm NorahSouth Indian · 1975Tropical Storm60 kt · 981 mb
• Tropical Storm SelmaSouth Indian · 1975Tropical Storm50 kt · 980 mb
• Tropical Depression AdeleSouth Indian · 1975Tropical Depression
• Unnamed tropical depressionSouth Indian · 1975Tropical Depression
• Tropical Depression BlandineSouth Indian · 1975Tropical Depression
• Tropical Depression CamilleSouth Indian · 1975Tropical Depression
• Cyclone Deborah:RobynSouth Indian · 1975Cyclone80 kt · 964 mb
• Unnamed tropical depressionSouth Indian · 1975Tropical Depression
• Tropical Depression ElsaSouth Indian · 1975Tropical Depression
• Tropical Depression FernandeSouth Indian · 1975Tropical Depression
• Tropical Depression GervaiseSouth Indian · 1975Tropical Depression
• Tropical Storm ShirleySouth Indian · 1975Tropical Storm55 kt · 981 mb
• Cyclone TrixieSouth Indian · 1975Cyclone115 kt · 925 mb
• Tropical Depression HeloseSouth Indian · 1975Tropical Depression
• Tropical Depression InesSouth Indian · 1975Tropical Depression
• Tropical Storm WilmaSouth Indian · 1975Tropical Storm60 kt · 980 mb
• Unnamed tropical depressionSouth Indian · 1975Tropical Depression
• Tropical Storm VidaSouth Indian · 1975Tropical Storm50 kt · 982 mb
• Unnamed tropical depressionSouth Indian · 1975Tropical Depression
• Cyclone BeverleySouth Indian · 1975Cyclone110 kt · 929 mb
• Tropical Depression JunonSouth Indian · 1975Tropical Depression
• Tropical Storm ClaraSouth Indian · 1975Tropical Storm50 kt · 985 mb
• Tropical Storm DeniseSouth Indian · 1975Tropical Storm45 kt · 992 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. This storm’s winds are ten-minute averages from its regional agency. They read about 12 percent lower than the one-minute winds US agencies use, so a Saffir-Simpson category is not given for it.

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.