2023 tropical cyclone season · North Atlantic
Hurricane Tammy Tammy · AL202023
Hurricane Tammy was tracked in the North Atlantic from 2023-10-18 to 2023-10-31 (13 days), peaking at 95 kt (H2) with a minimum pressure of 965 hPa. 300 archived forecasts from NHC, ECMWF, ECMWF ENS, GFS, GEFS are verified against its best track; at 48 hours the closest was NHC, 94 km off on average.
- ATCF ID
- AL202023
- Basin
- North Atlantic
- Tracked
- 2023-10-18 → 2023-10-31 (13 days)
- Peak wind
- 95 kt · 49 m/s · H2
- Minimum pressure
- 965 hPa
- Archived forecasts
- 300
- Sources
- NHC · ECMWF · ECMWF ENS · GFS · GEFS
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| NHC | 70 (33) | 94 (31) | 169 (29) | 450 (21) |
| ECMWF | 81 (36) | 123 (32) | 183 (28) | 607 (8) |
| ECMWF ENS | 79 (37) | 140 (33) | 209 (29) | 435 (20) |
| GFS | 91 (37) | 173 (33) | 247 (29) | 385 (21) |
| GEFS | 85 (37) | 177 (33) | 244 (29) | 338 (21) |
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 |
|---|---|---|---|---|
| 2023-10-18 18Z | 12.9°N 51.0°W | 35 | 1007 | TS |
| 2023-10-19 00Z | 13.0°N 52.5°W | 35 | 1006 | TS |
| 2023-10-19 06Z | 13.2°N 54.0°W | 45 | 1004 | TS |
| 2023-10-19 12Z | 13.4°N 55.3°W | 50 | 1004 | TS |
| 2023-10-19 18Z | 13.5°N 56.4°W | 50 | 1002 | TS |
| 2023-10-20 00Z | 13.6°N 57.2°W | 50 | 1001 | TS |
| 2023-10-20 06Z | 13.7°N 57.9°W | 50 | 1000 | TS |
| 2023-10-20 12Z | 13.9°N 58.4°W | 60 | 997 | TS |
| 2023-10-20 18Z | 14.1°N 58.9°W | 65 | 991 | H1 |
| 2023-10-21 00Z | 14.5°N 59.6°W | 70 | 991 | H1 |
| 2023-10-21 06Z | 14.9°N 60.3°W | 70 | 991 | H1 |
| 2023-10-21 12Z | 15.6°N 60.6°W | 75 | 987 | H1 |
| 2023-10-21 18Z | 16.6°N 61.0°W | 75 | 987 | H1 |
| 2023-10-22 00Z | 17.5°N 61.7°W | 80 | 987 | H1 |
| 2023-10-22 06Z | 18.0°N 62.2°W | 75 | 989 | H1 |
| 2023-10-22 12Z | 18.7°N 62.8°W | 75 | 990 | H1 |
| 2023-10-22 18Z | 19.4°N 63.4°W | 75 | 990 | H1 |
| 2023-10-23 00Z | 20.2°N 63.9°W | 75 | 992 | H1 |
| 2023-10-23 06Z | 21.0°N 64.0°W | 70 | 993 | H1 |
| 2023-10-23 12Z | 21.6°N 64.0°W | 70 | 993 | H1 |
| 2023-10-23 18Z | 22.1°N 63.8°W | 65 | 988 | H1 |
| 2023-10-24 00Z | 22.6°N 63.5°W | 65 | 987 | H1 |
| 2023-10-24 06Z | 23.1°N 63.1°W | 65 | 987 | H1 |
| 2023-10-24 12Z | 23.6°N 62.6°W | 65 | 987 | H1 |
| 2023-10-24 18Z | 24.0°N 62.0°W | 65 | 987 | H1 |
| 2023-10-25 00Z | 24.5°N 61.2°W | 75 | 976 | H1 |
| 2023-10-25 06Z | 25.1°N 60.4°W | 85 | 969 | H2 |
| 2023-10-25 12Z | 26.1°N 59.4°W | 95 | 965 | H2 |
| 2023-10-25 18Z | 27.5°N 58.3°W | 85 | 968 | H2 |
| 2023-10-26 00Z | 29.1°N 57.8°W | 80 | 970 | H1 |
| 2023-10-26 06Z | 30.0°N 58.3°W | 75 | 972 | H1 |
| 2023-10-26 12Z | 30.5°N 58.8°W | 70 | 975 | H1 |
| 2023-10-26 18Z | 31.0°N 59.5°W | 65 | 977 | H1 |
| 2023-10-27 00Z | 31.5°N 60.1°W | 60 | 980 | TS |
| 2023-10-27 06Z | 31.8°N 60.6°W | 55 | 985 | TS |
| 2023-10-27 12Z | 32.0°N 61.0°W | 55 | 988 | TS |
| 2023-10-27 18Z | 32.3°N 61.4°W | 55 | 988 | TS |
| 2023-10-28 00Z | 32.6°N 61.5°W | 50 | 991 | TS |
| 2023-10-28 06Z | 32.9°N 61.0°W | 45 | 994 | TS |
| 2023-10-28 12Z | 33.1°N 59.5°W | 45 | 995 | TS |
| 2023-10-28 18Z | 33.3°N 58.0°W | 40 | 997 | TS |
| 2023-10-29 00Z | 32.8°N 56.1°W | 35 | 1000 | TS |
| 2023-10-29 06Z | 32.6°N 54.3°W | 35 | 1002 | TS |
| 2023-10-29 12Z | 31.8°N 52.5°W | 35 | 1002 | TS |
| 2023-10-29 18Z | 30.9°N 50.9°W | 35 | 1002 | TS |
| 2023-10-30 00Z | 29.6°N 49.6°W | 30 | 1004 | TD |
| 2023-10-30 06Z | 28.5°N 49.0°W | 30 | 1005 | TD |
| 2023-10-30 12Z | 27.5°N 48.5°W | 30 | 1005 | TD |
| 2023-10-30 18Z | 26.5°N 48.1°W | 25 | 1006 | TD |
| 2023-10-31 00Z | 25.6°N 48.5°W | 25 | 1006 | TD |
| 2023-10-31 06Z | 25.1°N 49.0°W | 25 | 1007 | TD |
| 2023-10-31 12Z | 24.9°N 49.9°W | 20 | 1008 | TD |
| 2023-10-31 18Z | 24.6°N 50.6°W | 20 | 1008 | TD |