Surf Forecasts:
How big are the waves at Rock Island today (10 Sep):
- Morning surf: Morning surf (10 Sep, local time) - 3.5ft (1.0m), 8s period with S swell.
- Afternoon surf: Afternoon surf (10 Sep, local time) - 2.5ft (0.7m), 8s period with S swell.
- Evening surf: Evening surf (10 Sep, local time) - 2ft (0.6m), 8s period with S swell.
The current surf forecast for Rock Island at 12AM is: 1.4m 9s primary swell from a South direction and 0.2m 9s secondary swell from a East-southeast direction (forecast issued at 08:00pm September 09). An open ocean swell of 0.6m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Sep) | 3.5ft (1.0m) | 8s |
| Afternoon (10 Sep) | 2.5ft (0.7m) | 8s |
| Evening (10 Sep) | 2ft (0.6m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 49mm), heaviest during Thu night. Warm (max 22°C on Wed night, min 19°C on Thu night). Mainly fresh winds. | ||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | ||||||||||||||||
6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||
Wave Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 |
Wave Graph  | ||||||||||||||||||
 kJ | 455 | 351 | 306 | 220 | 181 | 143 | 90 | 66 | 65 | 46 | 45 | 31 | 30 | 28 | 28 | 28 | 19 | 19 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide | 4:34PM1.41m | 3:13AM1.43m | 4:57PM1.44m | 4:08AM1.50m | 5:19PM1.47m | |||||||||||||
Low Tide | 9:53PM0.96m | 10:09AM0.31m | 10:28PM0.82m | 10:49AM0.32m | ||||||||||||||
 | |  | |  |  | | | |  | |  | | | | | | | |
 | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — |
 | — | — | — | — | — | — | — | 5:57 | — | — | — | — | — | — | — | 5:55 | — | — |
mm | 3 | 5 | 7 | 1 | 1 | — | — | — | 6 | 14 | 1 | — | — | 2 | 4 | 3 | 3 | 1 |
Temp °C | 24 | 22 | 21 | 21 | 20 | 20 | 20 | 21 | 20 | 19 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 20 |
Feels °C | 22 | 19 | 18 | 18 | 17 | 17 | 18 | 19 | 18 | 18 | 20 | 19 | 20 | 18 | 19 | 18 | 18 | 20 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 |
| kJ | 455 | 351 | 306 | 220 | 181 | 143 | 90 | 66 | 65 | 46 | 45 | 31 | 30 | 28 | 28 | 28 | 19 | 19 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | E 16 | ESE 9 | ESE 9 | ESE 9 | — | — | ESE 9 | E 9 | SE 9 | SE 9 | SE 9 | SE 9 | S 9 | SE 10 | SE 10 | SE 10 | SE 10 |
| kJ | 179 | 5 | 9 | 9 | 8 | — | — | 8 | 6 | 3 | 3 | 3 | 3 | 1 | 4 | 4 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | E 16 | — | SE 11 | SE 11 | SE 11 | E 15 | E 15 | E 15 | ESE 10 | — | E 16 | E 15 | E 9 | SE 10 | S 9 | S 8 | S 8 | S 8 |
| kJ | 5 | — | 5 | 5 | 5 | 4 | 4 | 17 | 10 | — | 5 | 4 | 2 | 4 | 1 | 1 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | NE 3 | NE 3 | NE 3 | NE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NE 3 | NE 3 | NNE 2 | — | — | — | — | NNE 2 | NNE 3 |
| kJ | — | 6 | 9 | 9 | 7 | 8 | 6 | 3 | 3 | 2 | 2 | 1 | — | — | — | — | 1 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 38 | 51 | 145 | 145 | 145 | 8 | 0 | 0 | 8 | 38 | 0 | 51 | 51 | 51 | 51 | 51 | 51 | 51 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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