Surf Forecasts:
How big are the waves at Rock Island today (20 Aug):
- Morning surf: Morning surf (20 Aug, local time) - 0.5ft (0.2m), 6s period with SSE swell.
- Afternoon surf: Afternoon surf (20 Aug, local time) - 0.5ft (0.2m), 9s period with SSW swell.
- Evening surf: Evening surf (20 Aug, local time) - 0.5ft (0.2m), 8s period with SSW swell.
The current surf forecast for Rock Island at 7AM is: 0.1m 10s primary swell from a Southeast direction and 0.2m 6s secondary swell from a South-southeast direction (forecast issued at 02:00am August 20). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Aug) | 0.5ft (0.2m) | 6s |
| Afternoon (20 Aug) | 0.5ft (0.2m) | 9s |
| Evening (20 Aug) | 0.5ft (0.2m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 27°C on Thu morning, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||||||||||
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 | 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) | SSW 8 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 9 | SSW 9 | SSW 8 | S 10 | SSW 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 6 | 4 | 4 | 4 | 4 | 8 | 8 | 7 | 8 | 25 | 27 | 27 | 78 | 101 | 127 | 26 | 35 | 36 | 34 | 32 | 32 | 32 | 32 | 32 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | on | on | on | on | on |
High Tide | 9:59AM1.24m | 9:00PM1.45m | 11:32AM1.17m | 9:36PM1.42m | 1:55PM1.18m | |||||||||||||||||||
Low Tide | 3:23AM0.45m | 3:00PM0.90m | 4:23AM0.44m | 3:34PM1.04m | 5:36AM0.43m | 4:30PM1.15m | ||||||||||||||||||
 | |  |  | |  | |  |  | | | | | | | | | | | | | | |  | |
 | — | 5:03 | — | — | — | — | — | — | — | 5:05 | — | — | — | — | — | — | — | 5:05 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:24 | — | — | — | — | — | — | — | 6:23 | — | — | — | — | — | — | — | 6:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 25 | 26 | 27 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 |
Feels °C | 29 | 30 | 28 | 30 | 30 | 29 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 26 | 26 | 26 | 27 | 28 | 29 | 29 | 29 | 28 | 29 | 31 |
Swell 1 Height (m) Direction Period (s) | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SSW 9 | SE 10 | SE 11 | SE 11 | SSW 9 | SSW 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 |
| kJ | 3 | 3 | 3 | 3 | 3 | 8 | 8 | 7 | 6 | 25 | 27 | 27 | 4 | 4 | 4 | 26 | 35 | 36 | 34 | 32 | 32 | 32 | 32 | 32 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 11 | SE 11 | SE 11 | SE 11 | S 10 | SE 11 | SE 11 | SE 11 | SE 11 | S 9 | S 9 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 4 | SE 10 | SE 10 | SE 10 | SE 10 |
| kJ | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 8 | 4 | 4 | 4 | 30 | 2 | 2 | 4 | 4 | 4 | 4 | 2 | 4 | 4 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SW 8 | SW 8 | SW 8 | S 9 | E 6 | SSE 6 | SE 6 | SE 11 | SE 5 | SE 5 | SE 5 | ESE 5 | S 13 | S 9 | S 9 | S 9 | S 9 | SE 11 | SE 10 | SE 11 | SE 11 | SE 11 | SE 11 |
| kJ | 6 | 2 | 2 | 2 | 2 | 1 | 3 | 1 | 4 | 1 | 1 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 4 | 4 | 5 | 5 | 5 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SSE 5 | S 2 | S 3 | S 3 | S 3 | SSW 3 | SSW 3 | S 9 | S 9 | S 9 | S 4 | SSW 4 | SSW 4 | SSW 4 | SW 3 | S 3 | S 3 | S 4 | S 4 |
| kJ | — | — | — | — | — | 6 | 1 | 1 | 1 | 1 | 1 | 2 | 78 | 101 | 127 | 10 | 10 | 7 | 4 | 2 | 3 | 8 | 10 | 10 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 76 | 54 | 76 | 77 | 77 | 76 | 76 | 76 | 76 | 76 | 76 | 76 | 77 | 77 | 77 | 76 | 76 | 38 | 38 | 77 | 92 | 76 | 76 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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