Storm history › South Indian Ocean › 1999 season
Cyclone Billy (1999)
Billy was a Category 1 cyclone of the 1999 South Indian Ocean season. It was tracked from December 1, 1998 to December 7, 1998, about 6 days, and covered 1,033 miles.
At its peak it had winds of 75 mph (120 km/h) and a lowest pressure of 965 mb.
- Peak wind
- 75 mph
- Lowest pressure
- 965 mb
- Strongest
- Category 1 cyclone
- Duration
- 6 days
- Track length
- 1,033 mi
- Energy (ACE)
- 3.7
DepressionTropical stormCat 1Cat 2Cat 3Cat 4Cat 5
How it compares
- Peak winds: 390th highest of 951 South Indian Ocean storms on record, tied with Cyclone Alvaro (2024), Tropical Storm Filipo (2024), Cyclone Ialy (2024) and 46 more.
- Lowest pressure: 345th lowest of 1,029 South Indian Ocean storms with a recorded pressure, tied with Tropical Storm Elvis (2025), Cyclone Lorna (2019), Cyclone Antoinette (1997) and 8 more.
- Energy: 3% of the 1999 South Indian Ocean season's ACE.