Cyclone Alison (1999)

Basin

South Indian

Dates

November 6, 1998 to November 13, 1998

Peak strength

Category 1, 70 kt (81 mph)

Lowest pressure

955 mb (28.20 inHg)

Landfall

No; closest approach 766 km (476 mi)

Accumulated cyclone energy

6.9

Identifier

SH041999

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

• Unnamed tropical stormSouth Indian · 1999Tropical Storm35 kt
• Unnamed tropical stormSouth Indian · 1999Tropical Storm35 kt
• Tropical Storm ZeliaSouth Indian · 1999Tropical Storm45 kt · 990 mb
• Cyclone BillySouth Indian · 1999Cat 165 kt · 965 mb
• Tropical Storm CathySouth Indian · 1999Tropical Storm40 kt · 991 mb
• Unnamed tropical depressionSouth Indian · 1999Tropical Depression
• Cyclone AldaSouth Indian · 1999Cat 165 kt · 975 mb
• Cyclone Birenda:DamienSouth Indian · 1999Cat 180 kt · 950 mb
• Tropical Storm ChikitaSouth Indian · 1999Tropical Storm40 kt · 990 mb
• Unnamed tropical stormSouth Indian · 1999Tropical Storm40 kt
• Unnamed tropical stormSouth Indian · 1999Tropical Storm45 kt · 994 mb
• Unnamed tropical depressionSouth Indian · 1999Tropical Depression30 kt
• Cyclone DavinaSouth Indian · 1999Cat 3110 kt · 930 mb
• Unnamed tropical stormSouth Indian · 1999Tropical Storm35 kt
• Unnamed tropical stormSouth Indian · 1999Tropical Storm35 kt · 995 mb
• Cyclone VanceSouth Indian · 1999Cat 4125 kt · 910 mb
• Cyclone ElaineSouth Indian · 1999Cat 3100 kt · 945 mb
• Unnamed tropical depressionSouth Indian · 1999Tropical Depression
• Cyclone Evrina:FredericSouth Indian · 1999Cat 5140 kt · 920 mb
• Cyclone GwendaSouth Indian · 1999Cat 4130 kt · 900 mb
• Tropical Storm HamishSouth Indian · 1999Tropical Storm45 kt · 980 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.