| 23 | 1500 FRI SEP 20 | Tropical Depression Iselle | 25.1N | 113.1W | NNW | 5 (4) | 1006 (29.71) | 23 (20) |
| 22 | 0900 FRI SEP 20 | Tropical Depression Iselle | 24.7N | 112.9W | NNW | 5 (4) | 1005 (29.68) | 29 (25) |
| 21 | 0300 FRI SEP 20 | Tropical Depression Iselle | 24.3N | 112.7W | NNW | 5 (4) | 1003 (29.62) | 29 (25) |
| 20 | 2100 THU SEP 19 | Tropical Depression Iselle | 24N | 112.4W | NE | 6 (5) | 1004 (29.65) | 34 (30) |
| 19 | 1500 THU SEP 19 | Tropical Storm Iselle | 23.7N | 112.9W | NNE | 5 (4) | 1004 (29.65) | 40 (35) |
| 18 | 0900 THU SEP 19 | Tropical Storm Iselle | 23.2N | 113.1W | NE | 5 (4) | 1005 (29.68) | 40 (35) |
| 17 | 0300 THU SEP 19 | Tropical Storm Iselle | 22.8N | 113.6W | NE | 3 (3) | 1005 (29.68) | 40 (35) |
| 16 | 2100 WED SEP 18 | Tropical Storm Iselle | 22.7N | 113.9W | NNE | 5 (4) | 1005 (29.68) | 40 (35) |
| 15 | 1500 WED SEP 18 | Tropical Storm Iselle | 22.5N | 114.7W | NW | 5 (4) | 1002 (29.59) | 46 (40) |
| 14 | 0900 WED SEP 18 | Tropical Storm Iselle | 22.3N | 114.9W | NW | 5 (4) | 998 (29.47) | 52 (45) |
| 13 | 0300 WED SEP 18 | Tropical Storm Iselle | 22N | 114.7W | NW | 5 (4) | 990 (29.23) | 63 (55) |
| 12 | 2100 TUE SEP 17 | Tropical Storm Iselle | 21.8N | 114.1W | NW | 10 (9) | 990 (29.23) | 69 (60) |
| 11 | 1500 TUE SEP 17 | Tropical Storm Iselle | 21.7N | 114W | NW | 13 (11) | 994 (29.35) | 63 (55) |
| 10 | 0900 TUE SEP 17 | Tropical Storm Iselle | 21N | 113.3W | WNW | 16 (14) | 994 (29.35) | 63 (55) |
| 9 | 0300 TUE SEP 17 | Tropical Storm Iselle | 20.4N | 112.1W | NW | 16 (14) | 996 (29.41) | 58 (50) |
| 8 | 2100 MON SEP 16 | Tropical Storm Iselle | 19.8N | 111W | WNW | 16 (14) | 998 (29.47) | 52 (45) |
| 7 | 1500 MON SEP 16 | Tropical Storm Iselle | 18.3N | 109.5W | WNW | 14 (12) | 998 (29.47) | 52 (45) |
| 6 | 0900 MON SEP 16 | Tropical Storm Iselle | 17.6N | 108.6W | WNW | 14 (12) | 1000 (29.53) | 52 (45) |
| 5 | 0300 MON SEP 16 | Tropical Storm Iselle | 17.2N | 107.3W | WNW | 13 (11) | 1001 (29.56) | 46 (40) |
| 4 | 0000 MON SEP 16 | Tropical Storm Iselle | 16.5N | 106.5W | WNW | 12 (10) | 1002 (29.59) | 46 (40) |
| 3 | 2100 SUN SEP 15 | Tropical Depression Twelve-E | 15.8N | 106.4W | WNW | 14 (12) | 1006 (29.71) | 29 (25) |
| 2 | 1500 SUN SEP 15 | Tropical Depression Twelve-E | 15.4N | 104.9W | WNW | 10 (9) | 1005 (29.68) | 29 (25) |
| 1 | 0900 SUN SEP 15 | Tropical Depression Twelve-E | 15.4N | 104.5W | WNW | 10 (9) | 1005 (29.68) | 29 (25) |