Surf Forecasts:
How big are the waves at Rock Island today (17 Aug):
- Morning surf: Morning surf (17 Aug, local time) - 1.5ft (0.4m), 9s period with S swell.
- Afternoon surf: Afternoon surf (17 Aug, local time) - 1ft (0.3m), 8s period with SSW swell.
- Evening surf: Evening surf (17 Aug, local time) - 1.5ft (0.4m), 8s period with S swell.
The current surf forecast for Rock Island at 4AM is: 0.4m 9s primary swell from a South direction and 0.2m 11s secondary swell from a South-southeast direction (forecast issued at 08:00pm August 16). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Aug) | 1.5ft (0.4m) | 9s |
| Afternoon (17 Aug) | 1ft (0.3m) | 8s |
| Evening (17 Aug) | 1.5ft (0.4m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 3mm), mostly falling on Sun night. Warm (max 28°C on Mon afternoon, min 24°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Sun 16 | Monday 17 | Tuesday 18 | ||||||||||||||||
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 9 | S 8 | SSW 8 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 6 | SE 6 | SE 7 | SE 7 |
Wave Graph  | ||||||||||||||||||
 kJ | 38 | 37 | 37 | 24 | 24 | 23 | 22 | 14 | 22 | 21 | 13 | 7 | 6 | 6 | 6 | 6 | 7 | 11 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | on | cross-on | cross | cross | glassy | off | cross-off | glassy | on | cross-on | cross-on |
High Tide | 7:18PM1.48m | 7:12AM1.50m | 7:41PM1.48m | 8:00AM1.43m | 8:06PM1.47m | |||||||||||||
Low Tide | 1:12AM0.59m | 1:28PM0.46m | 1:51AM0.52m | 1:59PM0.61m | ||||||||||||||
 |  |  | |  |  | | | | | |  | |  | | | | | |
 | — | — | — | 5:01 | — | — | — | — | — | — | — | 5:01 | — | — | — | — | — | — |
 | 6:30 | — | — | — | — | — | — | — | 6:29 | — | — | — | — | — | — | — | 6:28 | — |
mm | 2 | — | 1 | 1 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 25 | 25 | 24 | 25 | 27 | 28 | 27 | 26 | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 26 |
Feels °C | 28 | 27 | 27 | 28 | 27 | 28 | 30 | 30 | 29 | 28 | 29 | 29 | 29 | 29 | 30 | 29 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | SSW 8 | S 8 | S 8 | SSW 8 | SSW 8 | SSE 6 | SSE 6 | SE 6 | SE 6 | SE 7 | SE 7 |
| kJ | 38 | 37 | 37 | 24 | 24 | 23 | 22 | 14 | 22 | 21 | 13 | 7 | 3 | 3 | 5 | 6 | 7 | 11 |
Swell 2 Height (m) Direction Period (s) | SSE 11 | SSE 11 | SSE 11 | SE 11 | SSE 11 | SE 11 | SE 11 | SSE 5 | SE 11 | SE 11 | SSE 6 | SSE 6 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 |
| kJ | 12 | 12 | 12 | 19 | 11 | 5 | 5 | 3 | 4 | 4 | 3 | 3 | 6 | 6 | 6 | 6 | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | E 9 | E 9 | E 8 | E 8 | E 8 | E 9 | E 8 | SE 11 | E 8 | E 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 |
| kJ | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 4 | 1 | 1 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 38 | 38 | 51 | 16 | 18 | 64 | 64 | 51 | 51 | 51 | 51 | 51 | 18 | 51 | 51 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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