2023 tropical cyclone season · western North Pacific
Typhoon Koinu Koinu · WP142023
Typhoon Koinu was tracked in the western North Pacific from 2023-09-27 to 2023-10-10 (13 days), peaking at 120 kt (H4) with a minimum pressure of 936 hPa. 193 archived forecasts from ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track; at 48 hours the closest was ECMWF ENS, 84 km off on average.
- ATCF ID
- WP142023
- Basin
- western North Pacific
- Tracked
- 2023-09-27 → 2023-10-10 (13 days)
- Peak wind
- 120 kt · 62 m/s · H4
- Minimum pressure
- 936 hPa
- Archived forecasts
- 193
- Sources
- ECMWF · ECMWF ENS · GFS · GEFS
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| ECMWF | 47 (38) | 86 (34) | 118 (30) | 155 (10) |
| ECMWF ENS | 49 (38) | 84 (34) | 105 (30) | 122 (19) |
| GFS | 57 (37) | 100 (33) | 134 (29) | 259 (17) |
| GEFS | 68 (38) | 115 (34) | 144 (30) | 262 (22) |
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 |
|---|---|---|---|---|
| 2023-09-27 12Z | 14.2°N 143.8°E | 15 | 1010 | TD |
| 2023-09-27 18Z | 14.7°N 143.1°E | 15 | 1010 | TD |
| 2023-09-28 00Z | 15.5°N 141.2°E | 15 | 1010 | TD |
| 2023-09-28 06Z | 15.7°N 139.9°E | 15 | 1010 | TD |
| 2023-09-28 12Z | 15.8°N 138.3°E | 20 | 1009 | TD |
| 2023-09-28 18Z | 15.8°N 137.0°E | 20 | 1009 | TD |
| 2023-09-29 00Z | 15.6°N 136.1°E | 20 | 1009 | TD |
| 2023-09-29 06Z | 15.5°N 135.3°E | 20 | 1008 | TD |
| 2023-09-29 12Z | 15.4°N 134.8°E | 25 | 1007 | TD |
| 2023-09-29 18Z | 15.5°N 132.4°E | 30 | 1001 | TD |
| 2023-09-30 00Z | 15.8°N 131.8°E | 30 | 1001 | TD |
| 2023-09-30 06Z | 16.1°N 131.4°E | 35 | 1000 | TS |
| 2023-09-30 12Z | 16.3°N 130.9°E | 40 | 996 | TS |
| 2023-09-30 18Z | 16.8°N 130.2°E | 45 | 995 | TS |
| 2023-10-01 00Z | 17.5°N 129.4°E | 55 | 990 | TS |
| 2023-10-01 06Z | 17.9°N 128.9°E | 65 | 984 | H1 |
| 2023-10-01 12Z | 18.3°N 128.5°E | 75 | 977 | H1 |
| 2023-10-01 18Z | 18.7°N 128.0°E | 80 | 973 | H1 |
| 2023-10-02 00Z | 19.1°N 127.4°E | 105 | 953 | H3 |
| 2023-10-02 06Z | 19.6°N 126.7°E | 110 | 950 | H3 |
| 2023-10-02 12Z | 20.0°N 126.1°E | 120 | 939 | H4 |
| 2023-10-02 18Z | 20.3°N 125.6°E | 110 | 946 | H3 |
| 2023-10-03 00Z | 20.6°N 125.2°E | 105 | 949 | H3 |
| 2023-10-03 06Z | 21.2°N 124.9°E | 100 | 955 | H3 |
| 2023-10-03 12Z | 21.7°N 124.7°E | 95 | 957 | H2 |
| 2023-10-03 18Z | 22.0°N 124.2°E | 90 | 963 | H2 |
| 2023-10-04 00Z | 22.2°N 123.5°E | 105 | 948 | H3 |
| 2023-10-04 06Z | 22.1°N 122.6°E | 115 | 940 | H4 |
| 2023-10-04 12Z | 22.1°N 121.9°E | 120 | 936 | H4 |
| 2023-10-04 18Z | 21.9°N 121.2°E | 120 | 936 | H4 |
| 2023-10-05 00Z | 22.0°N 120.8°E | 110 | 947 | H3 |
| 2023-10-05 06Z | 22.1°N 120.0°E | 90 | 961 | H2 |
| 2023-10-05 12Z | 22.1°N 119.0°E | 80 | 971 | H1 |
| 2023-10-05 18Z | 21.9°N 118.3°E | 70 | 979 | H1 |
| 2023-10-06 00Z | 21.8°N 117.7°E | 90 | 965 | H2 |
| 2023-10-06 06Z | 21.7°N 116.8°E | 100 | 956 | H3 |
| 2023-10-06 12Z | 21.5°N 116.3°E | 100 | 957 | H3 |
| 2023-10-06 18Z | 21.2°N 115.7°E | 105 | 953 | H3 |
| 2023-10-07 00Z | 21.1°N 115.4°E | 100 | 958 | H3 |
| 2023-10-07 06Z | 21.2°N 115.2°E | 105 | 953 | H3 |
| 2023-10-07 12Z | 21.3°N 115.1°E | 100 | 957 | H3 |
| 2023-10-07 18Z | 21.4°N 114.9°E | 85 | 968 | H2 |
| 2023-10-08 00Z | 21.5°N 114.6°E | 75 | 977 | H1 |
| 2023-10-08 06Z | 21.6°N 114.3°E | 80 | 973 | H1 |
| 2023-10-08 12Z | 21.6°N 114.0°E | 90 | 968 | H2 |
| 2023-10-08 18Z | 21.7°N 113.6°E | 70 | 981 | H1 |
| 2023-10-09 00Z | 21.8°N 113.4°E | 50 | 994 | TS |
| 2023-10-09 06Z | 21.7°N 113.1°E | 40 | 997 | TS |
| 2023-10-09 12Z | 21.2°N 112.5°E | 30 | 1000 | TD |
| 2023-10-09 18Z | 20.9°N 111.8°E | 25 | 1010 | TD |
| 2023-10-10 00Z | 20.6°N 111.3°E | 20 | 1003 | TD |