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| Hurricane Strength by Low Pressure | |||
| Category | Central Pressure | Winds | Surge |
| 1 — Minimal | Greater than 980 mb or 28.94 in | 74 to 95 mph or 64 to 83 kts | 4 to 5 feet |
| 2 — Moderate | 965 to 979 mb or 28.50 to 28.91 in | 96 to 110 mph or 65 to 96 kts | 6 to 8 feet |
| 3 — Extensive | 945 to 964 mb or 27.91 to 28.47 in | 111 to 130 mph or 97 to 113 kts | 9 to 12 feet |
| 4 — Extreme (Ian 940) | 920 to 944 mb or 27.17 to 27.88 in | 131 to 155 mph or 114 to 135 kts | 13 to 18 feet |
| 5 — Catastrophic | less than 920 mb or 27.17 in | greater than 155 mph or 135 kts | greater than 18 feet |
