1998 Global Tropical Cyclones Outside the Northwest Pacific
Total recorded in this database in 1998 21 Tropical Cyclones outside the Northwest Pacific: 21 in the South Indian Ocean. Strongest of the year: Tropical Cyclone Thelma (about 69.4 m/s). For Northwest Pacific typhoons, see 1998 Typhoon .
| The name | English Name | ocean area | Peak Category | Max Wind(m/s) | Minimum Pressure (hPa) | Formation Date | Data Reliability ⓘ |
|---|---|---|---|---|---|---|---|
| - | - | South Indian Ocean | Tropical Depression | 18 | 995 | 1998-01-16 | Reliable |
| Les | Les | South Indian Ocean | Category 1 Tropical Cyclone | 25.7 | 980 | 1998-01-22 | Reliable |
| Tiffany | Tiffany | South Indian Ocean | Category 5 Tropical Cyclone | 61.7 | 940 | 1998-01-22 | Reliable |
| Beltane | Beltane | South Indian Ocean | Moderate Tropical Storm | 20.6 | 992 | 1998-02-01 | Reliable |
| Cindy/Victor | Cindy/Victor | South Indian Ocean | Category 3 tropical cyclone | 46.3 | 970 | 1998-02-05 | Reliable |
| Anacelle | Anacelle | South Indian Ocean | Severe Tropical Cyclone | 59.2 | 950 | 1998-02-05 | Reliable |
| - | - | South Indian Ocean | Moderate Tropical Storm | 23.1 | 997 | 1998-02-15 | Reliable |
| Donaline | Donaline | South Indian Ocean | Severe Tropical Storm | 28.3 | 988 | 1998-03-04 | Reliable |
| Elsie | Elsie | South Indian Ocean | Tropical Cyclone | 46.3 | 975 | 1998-03-05 | Reliable |
| Fiona | Fiona | South Indian Ocean | Tropical Depression | 18 | 995 | 1998-03-13 | Reliable |
| Gemma | Gemma | South Indian Ocean | Tropical Cyclone | 36 | 985 | 1998-04-06 | Reliable |
| - | - | South Indian Ocean | Tropical Disturbance | 15.4 | - | 1998-04-06 | Reliable |
| - | - | South Indian Ocean | Category 1 Tropical Cyclone | 20.6 | - | 1998-04-16 | Reliable |
| - | - | South Indian Ocean | Moderate Tropical Storm | 20.6 | - | 1998-04-17 | Reliable |
| - | - | South Indian Ocean | Tropical Depression | 18 | - | 1998-07-20 | Reliable |
| - | - | South Indian Ocean | Tropical Depression | 18 | - | 1998-09-27 | Reliable |
| Zelia | Zelia | South Indian Ocean | Category 1 Tropical Cyclone | 23.1 | 990 | 1998-10-06 | Reliable |
| Alison | Alison | South Indian Ocean | Category 3 tropical cyclone | 36 | 955 | 1998-11-06 | Reliable |
| Thelma | Thelma | South Indian Ocean | Category 5 Tropical Cyclone | 69.4 | 920 | 1998-12-01 | Reliable |
| Billy | Billy | South Indian Ocean | Category 2 Tropical Cyclone | 33.4 | 966 | 1998-12-01 | Reliable |
| Cathy | Cathy | South Indian Ocean | Category 1 Tropical Cyclone | 20.6 | 991 | 1998-12-23 | Reliable |
Data sources: NOAA IBTrACS v04r01; 等级按各ocean area当地机构分级换算, for reference only.