2023 tropical cyclone season · eastern North Pacific
Hurricane Norma Norma · EP172023
Hurricane Norma was tracked in the eastern North Pacific from 2023-10-17 to 2023-10-23 (6 days), peaking at 115 kt (H4) with a minimum pressure of 939 hPa. 151 archived forecasts from NHC, ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track; at 48 hours the closest was NHC, 81 km off on average.
- ATCF ID
- EP172023
- Basin
- eastern North Pacific
- Tracked
- 2023-10-17 → 2023-10-23 (6 days)
- Peak wind
- 115 kt · 59 m/s · H4
- Minimum pressure
- 939 hPa
- Archived forecasts
- 151
- Sources
- NHC · ECMWF · ECMWF ENS · GFS · GEFS
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| NHC | 59 (19) | 81 (15) | 119 (11) | 235 (3) |
| ECMWF | 60 (20) | 103 (16) | 230 (12) | 664 (2) |
| ECMWF ENS | 54 (20) | 108 (16) | 223 (12) | 560 (4) |
| GFS | 56 (20) | 98 (16) | 185 (11) | 280 (4) |
| GEFS | 45 (20) | 88 (16) | 154 (12) | 470 (4) |
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 |
|---|---|---|---|---|
| 2023-10-17 06Z | 12.4°N 104.4°W | 30 | 1005 | TD |
| 2023-10-17 12Z | 12.7°N 105.8°W | 30 | 1005 | TD |
| 2023-10-17 18Z | 12.9°N 106.9°W | 35 | 1004 | TS |
| 2023-10-18 00Z | 13.4°N 107.6°W | 45 | 1000 | TS |
| 2023-10-18 06Z | 13.9°N 107.8°W | 55 | 995 | TS |
| 2023-10-18 12Z | 14.6°N 107.8°W | 60 | 991 | TS |
| 2023-10-18 18Z | 15.3°N 107.9°W | 65 | 987 | H1 |
| 2023-10-19 00Z | 16.0°N 107.9°W | 80 | 975 | H1 |
| 2023-10-19 06Z | 16.4°N 107.8°W | 105 | 953 | H3 |
| 2023-10-19 12Z | 16.9°N 107.7°W | 115 | 939 | H4 |
| 2023-10-19 18Z | 17.3°N 108.0°W | 110 | 941 | H3 |
| 2023-10-20 00Z | 17.9°N 108.2°W | 105 | 948 | H3 |
| 2023-10-20 06Z | 18.5°N 108.5°W | 100 | 955 | H3 |
| 2023-10-20 12Z | 19.1°N 109.0°W | 100 | 958 | H3 |
| 2023-10-20 18Z | 19.7°N 109.5°W | 105 | 955 | H3 |
| 2023-10-21 00Z | 20.5°N 109.9°W | 105 | 955 | H3 |
| 2023-10-21 06Z | 21.4°N 110.1°W | 100 | 958 | H3 |
| 2023-10-21 12Z | 22.3°N 110.2°W | 90 | 964 | H2 |
| 2023-10-21 18Z | 22.9°N 110.3°W | 75 | 974 | H1 |
| 2023-10-22 00Z | 23.6°N 110.1°W | 60 | 986 | TS |
| 2023-10-22 06Z | 24.3°N 109.8°W | 50 | 990 | TS |
| 2023-10-22 12Z | 24.6°N 109.6°W | 55 | 987 | TS |
| 2023-10-22 18Z | 24.7°N 109.3°W | 55 | 987 | TS |
| 2023-10-23 00Z | 24.7°N 109.0°W | 45 | 991 | TS |
| 2023-10-23 06Z | 24.5°N 108.7°W | 35 | 993 | TS |
| 2023-10-23 12Z | 24.7°N 107.9°W | 30 | 1000 | TD |