2023 tropical cyclone season · North Indian Ocean
Cyclone Unnamed IO04 IO04 · IO042023
Cyclone Unnamed IO04 was tracked in the North Indian Ocean from 2023-07-30 to 2023-08-03 (4 days), peaking at 40 kt (TS) with a minimum pressure of 981 hPa. 33 archived forecasts from ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track.
- ATCF ID
- IO042023
- Basin
- North Indian Ocean
- Tracked
- 2023-07-30 → 2023-08-03 (4 days)
- Peak wind
- 40 kt · 21 m/s · TS
- Minimum pressure
- 981 hPa
- Archived forecasts
- 33
- Sources
- ECMWF · ECMWF ENS · GFS · GEFS
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| ECMWF | 105 (2) | — | — | — |
| ECMWF ENS | 99 (7) | 70 (2) | — | — |
| GFS | 92 (2) | — | — | — |
| GEFS | 31 (2) | — | — | — |
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 |
|---|---|---|---|---|
| 2023-07-30 12Z | 19.0°N 90.0°E | 25 | 1004 | TD |
| 2023-07-30 18Z | 18.7°N 90.5°E | 30 | 1000 | TD |
| 2023-07-31 00Z | 18.6°N 91.0°E | 30 | 984 | TD |
| 2023-07-31 06Z | 18.6°N 91.3°E | 30 | 992 | TD |
| 2023-07-31 12Z | 19.0°N 91.8°E | 35 | 990 | TS |
| 2023-07-31 18Z | 19.9°N 92.0°E | 40 | 987 | TS |
| 2023-08-01 00Z | 19.9°N 92.0°E | 40 | 988 | TS |
| 2023-08-01 06Z | 21.6°N 90.7°E | 35 | 990 | TS |
| 2023-08-01 12Z | 22.1°N 89.8°E | 30 | 981 | TD |
| 2023-08-01 18Z | 22.7°N 88.6°E | 25 | 982 | TD |
| 2023-08-02 00Z | 23.0°N 87.3°E | 25 | 993 | TD |
| 2023-08-02 06Z | 23.3°N 85.8°E | 20 | 992 | TD |