1998 Hurricane/Tropical Data for Southern Indian Ocean
Individual Storm Summary
Winds in knots, pressure in millibars, category is based on Saffir-Simpson scale.
| # | Name | Date | Wind | Pres | Cat | |
| 1 | Tropical Storm #1 | 18-24 JUL | 45 | - | - | |
| 2 | Tropical Storm #2 | 4-13 OCT | 60 | - | - | |
| 3 | Tropical Storm #3 | 24-28 OCT | 35 | - | - | |
| 4 | Cyclone #4 | 28 OCT- 4 NOV | 100 | - | 3 | |
| 5 | Cyclone #5 | 15-21 NOV | 70 | - | 1 | |
| 6 | Cyclone #6 | 21-27 NOV | 90 | - | 2 | |
| 7 | Cyclone #7 | 2-10 DEC | 65 | - | 1 | |
| 8 | Tropical Storm #8 | 24-29 DEC | 40 | - | - | |
| 9 | Cyclone #9 | 25 DEC- 2 JAN | 65 | - | 1 | |
| 10 | Cyclone #10 | 1- 9 JAN | 145 | - | 5 | |
| 11 | Cyclone #11 | 20 DEC- 9 JAN | 140 | - | 5 | |
| 12 | Cyclone #12 | 1 JAN- 2 FEB | 90 | - | 2 | |
| 13 | Tropical Storm #13 | 17-23 JAN | 35 | - | - | |
| 14 | Tropical Storm #14 | 21 JAN- 2 FEB | 50 | - | - | |
| 15 | Cyclone #15 | 22 JAN- 1 FEB | 120 | - | 4 | |
| 16 | Tropical Storm #16 | 24-27 JAN | 40 | - | - | |
| 17 | Cyclone #17 | 31 JAN- 2 FEB | 65 | - | 1 | |
| 18 | Cyclone #18 | 31 JAN- 4 FEB | 75 | - | 1 | |
| 19 | Tropical Storm #19 | 31 JAN- 4 FEB | 45 | - | - | |
| 20 | Cyclone #20 | 5-13 FEB | 115 | - | 4 | |
| 21 | Tropical Storm #21 | 1-10 FEB | 35 | - | - | |
| 22 | Cyclone #22 | 4-18 FEB | 90 | - | 2 | |
| 23 | Tropical Storm #23 | 12-18 FEB | 40 | - | - | |
| 24 | Tropical Storm #24 | 15-18 FEB | 45 | - | - | |
| 25 | Tropical Storm #25 | 24-28 FEB | 35 | - | - | |
| 26 | Tropical Storm #26 | 4- 9 MAR | 55 | - | - | |
| 27 | Cyclone #27 | 4-18 MAR | 90 | - | 2 | |
| 28 | Tropical Storm #28 | 13-20 MAR | 35 | - | - | |
| 29 | Cyclone #29 | 17-27 MAR | 90 | - | 2 | |
| 30 | Cyclone #30 | 19-31 MAR | 65 | - | 1 | |
| 31 | Cyclone #31 | 28 MAR- 6 APR | 100 | - | 3 | |
| 32 | Cyclone #32 | 6-15 APR | 70 | - | 1 | |
| 33 | Subtropical Storm #33 | 6- 7 APR | 30 | - | - | |
| 34 | Tropical Storm #34 | 17-22 APR | 40 | - | - | |
| 35 | Tropical Storm #35 | 16-19 APR | 40 | - | - | |
| 36 | Tropical Storm #36 | 20-26 APR | 45 | - | - | |
| 37 | Tropical Storm #37 | 29 APR- 1 MAY | 35 | - | - |
Saffir-Simpson Scale
The chart color codes intensity (category based on Saffir-Simpson scale):
| Type | Category | Pressure (mb) | Winds (knots) |
Winds (mph) |
Line Color |
| Depression | td | ----- | < 34 | < 39 | Green |
| Tropical Storm | TS | ----- | 34-63 | 39-73 | Yellow |
| Hurricane | 1 | > 980 | 64-82 | 74-95 | Red |
| Hurricane | 2 | 965-980 | 83-95 | 96-110 | Light Red |
| Hurricane | 3 | 945-965 | 96-112 | 111-130 | Magenta |
| Hurricane | 4 | 920-945 | 113-135 | 131-155 | Light Magenta |
| Hurricane | 5 | < 920 | >135 | >155 | White |
NOTE: Pressures are in millibars and winds are in knots where one knot is equal to 1.15 mph
Individual Storm Details
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Tropical Storm #37 (29 APR-01 MAY) Storm - Max Winds: 35 |
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Tropical Storm #36 (20-26 APR) Storm - Max Winds: 45 |
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Tropical Storm #35 (16-19 APR) Storm - Max Winds: 40 |
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Tropical Storm #34 (17-22 APR) Storm - Max Winds: 40 |
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Subtropical Storm #33 (06-07 APR) Storm - Max Winds: 30 |
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Cyclone #32 (06-15 APR) Storm - Max Winds: 70 Category: 1 |
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Cyclone #31 (28 MAR-06 APR) Storm - Max Winds: 100 Category: 3 |
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Cyclone #30 (19-31 MAR) Storm - Max Winds: 65 Category: 1 |
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Cyclone #29 (17-27 MAR) Storm - Max Winds: 90 Category: 2 |
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Tropical Storm #28 (13-20 MAR) Storm - Max Winds: 35 |
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Cyclone #27 (04-18 MAR) Storm - Max Winds: 90 Category: 2 |
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Tropical Storm #26 (04-09 MAR) Storm - Max Winds: 55 |
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Tropical Storm #25 (24-28 FEB) Storm - Max Winds: 35 |
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Tropical Storm #24 (15-18 FEB) Storm - Max Winds: 45 |
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Tropical Storm #23 (12-18 FEB) Storm - Max Winds: 40 |
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Cyclone #22 (04-18 FEB) Storm - Max Winds: 90 Category: 2 |
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Tropical Storm #21 (01-10 FEB) Storm - Max Winds: 35 |
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Cyclone #20 (05-13 FEB) Storm - Max Winds: 115 Category: 4 |
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Tropical Storm #19 (31 JAN-04 FEB) Storm - Max Winds: 45 |
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Cyclone #18 (31 JAN-04 FEB) Storm - Max Winds: 75 Category: 1 |
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Cyclone #17 (31 JAN-02 FEB) Storm - Max Winds: 65 Category: 1 |
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Tropical Storm #16 (24-27 JAN) Storm - Max Winds: 40 |
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Cyclone #15 (22 JAN-01 FEB) Storm - Max Winds: 120 Category: 4 |
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Tropical Storm #14 (21 JAN-02 FEB) Storm - Max Winds: 50 |
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Tropical Storm #13 (17-23 JAN) Storm - Max Winds: 35 |
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Cyclone #12 (01 JAN-02 FEB) Storm - Max Winds: 90 Category: 2 |
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Cyclone #11 (20 DEC-09 JAN) Storm - Max Winds: 140 Category: 5 |
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Cyclone #10 (01-09 JAN) Storm - Max Winds: 145 Category: 5 |
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Cyclone #9 (25 DEC-02 JAN) Storm - Max Winds: 65 Category: 1 |
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Tropical Storm #8 (24-29 DEC) Storm - Max Winds: 40 |
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Cyclone #7 (02-10 DEC) Storm - Max Winds: 65 Category: 1 |
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Cyclone #6 (21-27 NOV) Storm - Max Winds: 90 Category: 2 |
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Cyclone #5 (15-21 NOV) Storm - Max Winds: 70 Category: 1 |
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Cyclone #4 (28 OCT-04 NOV) Storm - Max Winds: 100 Category: 3 |
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Tropical Storm #3 (24-28 OCT) Storm - Max Winds: 35 |
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Tropical Storm #2 (04-13 OCT) Storm - Max Winds: 60 |
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Tropical Storm #1 (18-24 JUL) Storm - Max Winds: 45 |





































