2026 tropical cyclone season · North Indian Ocean
Cyclone Arnab Arnab · IO022026
Cyclone Arnab was tracked in the North Indian Ocean from 2026-10-26 to 2026-10-29 (3 days), peaking at 119 kt (H4) with a minimum pressure of 940 hPa. 131 archived forecasts from JTWC, ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track; at 48 hours the closest was ECMWF ENS, 43 km off on average.
- ATCF ID
- IO022026
- Basin
- North Indian Ocean
- Tracked
- 2026-10-26 → 2026-10-29 (3 days)
- Peak wind
- 119 kt · 61 m/s · H4
- Minimum pressure
- 940 hPa
- Archived forecasts
- 131
- Sources
- JTWC · ECMWF · ECMWF ENS · GFS · GEFS
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| JTWC | 59 (8) | 70 (4) | 33 (1) | — |
| ECMWF | 52 (8) | 87 (4) | 70 (1) | — |
| ECMWF ENS | 49 (8) | 43 (4) | 56 (1) | — |
| GFS | 44 (8) | 154 (4) | 68 (1) | — |
| GEFS | 42 (8) | 88 (4) | 77 (1) | — |
Mean great-circle distance to the best track at each lead time, counted while the system was a tropical or subtropical cyclone; the number of cases is in brackets.
Best track
Six-hourly positions of the US best track (JTWC / NHC, one-minute winds); grades on the Saffir–Simpson scale.
| Time (UTC) | Position | Wind (kt) | Pressure (hPa) | Grade |
|---|---|---|---|---|
| 2026-10-26 00Z | 16.0°N 89.1°E | 35 | 1002 | TS |
| 2026-10-26 06Z | 15.3°N 88.4°E | 64 | 986 | H1 |
| 2026-10-26 12Z | 15.9°N 87.2°E | 80 | 974 | H1 |
| 2026-10-26 18Z | 16.0°N 85.8°E | 80 | 972 | H1 |
| 2026-10-27 00Z | 16.0°N 84.8°E | 89 | 968 | H2 |
| 2026-10-27 06Z | 16.2°N 83.8°E | 115 | 947 | H4 |
| 2026-10-27 12Z | 16.3°N 82.7°E | 119 | 940 | H4 |
| 2026-10-27 18Z | 16.4°N 81.6°E | 99 | 958 | H3 |
| 2026-10-28 00Z | 16.4°N 81.4°E | 70 | 977 | H1 |
| 2026-10-28 06Z | 16.4°N 81.8°E | 54 | 988 | TS |
| 2026-10-28 12Z | 17.0°N 81.8°E | 39 | 992 | TS |
| 2026-10-28 18Z | 17.9°N 81.8°E | — | — | — |
| 2026-10-29 00Z | 19.0°N 81.9°E | — | — | — |
| 2026-10-29 06Z | 20.1°N 82.1°E | 25 | 1005 | TD |