2025 tropical cyclone season · Southern Hemisphere

Cyclone Unnamed SH31 SH31 · SH312025

Cyclone Unnamed SH31 was tracked in the Southern Hemisphere from 2025-04-16 to 2025-04-23 (7 days), peaking at 35 kt (TS) with a minimum pressure of 998 hPa. 89 archived forecasts from ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track; at 48 hours the closest was ECMWF ENS, 94 km off on average.

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ATCF ID
SH312025
Basin
Southern Hemisphere
Tracked
2025-04-16 → 2025-04-23 (7 days)
Peak wind
35 kt · 18 m/s · TS
Minimum pressure
998 hPa
Archived forecasts
89
Sources
ECMWF · ECMWF ENS · GFS · GEFS
TDTSH1H2H3H4H5

Forecast track error (km)

Source24 h48 h72 h120 h
ECMWF67 (14)103 (10)94 (6)—
ECMWF ENS54 (14)94 (10)114 (6)—
GFS60 (14)115 (10)102 (6)—
GEFS68 (14)124 (10)175 (6)—

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)PositionWind (kt)Pressure (hPa)Grade
2025-04-18 06Z11.2°S 139.7°E35998TS
2025-04-18 12Z11.6°S 140.5°E35999TS
2025-04-18 18Z11.9°S 141.1°E291000TD
2025-04-19 00Z12.4°S 141.6°E291000TD
2025-04-19 06Z12.7°S 141.1°E291000TD
2025-04-19 12Z12.7°S 141.0°E291001TD
2025-04-19 18Z12.5°S 141.0°E291001TD
2025-04-20 00Z12.4°S 141.1°E291001TD
2025-04-20 06Z12.6°S 140.9°E291002TD
2025-04-20 12Z12.6°S 140.2°E291002TD
2025-04-20 18Z12.6°S 139.5°E291002TD
2025-04-21 00Z12.3°S 138.5°E291001TD
2025-04-21 06Z12.1°S 137.6°E351001TS
2025-04-21 12Z11.6°S 136.6°E291003TD
2025-04-21 18Z10.9°S 135.4°E291004TD
2025-04-22 00Z10.4°S 134.1°E291004TD
2025-04-22 06Z10.3°S 134.0°E291004TD
2025-04-22 12Z10.0°S 133.2°E291007TD