2025 tropical cyclone season · Southern Hemisphere
Cyclone Dianne Dianne · SH282025
Cyclone Dianne was tracked in the Southern Hemisphere from 2025-03-26 to 2025-03-30 (4 days), peaking at 45 kt (TS) with a minimum pressure of 991 hPa. 34 archived forecasts from ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track.
- ATCF ID
- SH282025
- Basin
- Southern Hemisphere
- Tracked
- 2025-03-26 → 2025-03-30 (4 days)
- Peak wind
- 45 kt · 23 m/s · TS
- Minimum pressure
- 991 hPa
- Archived forecasts
- 34
- Sources
- ECMWF · ECMWF ENS · GFS · GEFS
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| ECMWF | 22 (1) | — | — | — |
| ECMWF ENS | 46 (1) | — | — | — |
| GFS | 70 (1) | — | — | — |
| GEFS | 76 (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 |
|---|---|---|---|---|
| 2025-03-28 00Z | 14.1°S 123.6°E | 35 | 995 | TS |
| 2025-03-28 06Z | 14.8°S 123.7°E | 39 | 991 | TS |
| 2025-03-28 12Z | 15.6°S 123.8°E | 39 | 992 | TS |
| 2025-03-28 18Z | 16.2°S 123.8°E | 45 | 991 | TS |
| 2025-03-29 00Z | 17.0°S 124.1°E | 45 | 994 | TS |