Surf Forecasts:
How big are the waves at Rock Island today (11 Aug):
- Afternoon surf: Afternoon surf (11 Aug, local time) - 1.5ft (0.5m), 11s period with SSW swell.
- Evening surf: Evening surf (11 Aug, local time) - 1.5ft (0.5m), 10s period with SSW swell.
The current surf forecast for Rock Island at 8PM is: 0.5m 10s primary swell from a South-southwest direction and 0.1m 13s secondary swell from a Southeast direction, 0.7m 4s secondary swell from a Southwest direction (forecast issued at 02:00pm August 11). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Aug) | - | - |
| Afternoon (11 Aug) | 1.5ft (0.5m) | 11s |
| Evening (11 Aug) | 1.5ft (0.5m) | 10s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 65mm), heaviest during Tue night. Warm (max 28°C on Thu afternoon, min 23°C on Tue night). Mainly strong winds. | ||||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | ||||||||||||||||||
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 11 | SSW 11 | SSW 10 | SSW 10 | SSW 6 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | S 10 | S 9 | SSW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 64 | 64 | 62 | 59 | 93 | 58 | 58 | 106 | 59 | 59 | 40 | 40 | 39 | 38 | 38 | 38 | 38 | 47 | 45 | 29 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-on | on | cross-on | cross | cross-off | cross | cross-off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:17PM1.41m | 3:09AM1.45m | 5:43PM1.45m | 4:05AM1.50m | 6:08PM1.47m | |||||||||||||||
Low Tide | 9:46AM0.18m | 10:08PM1.08m | 10:31AM0.14m | 10:48PM0.99m | 11:12AM0.14m | |||||||||||||||
 |  |  |  |  |  | | |  | | |  |  | | | | |  | | | |
 | — | — | — | — | — | 4:58 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — |
 | — | — | 6:36 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:34 | — |
mm | — | — | 2 | 4 | 20 | 7 | 3 | 3 | 5 | 7 | 3 | 3 | — | — | — | — | 1 | — | 2 | 3 |
Temp °C | 26 | 26 | 26 | 25 | 24 | 23 | 24 | 24 | 25 | 26 | 25 | 24 | 24 | 24 | 23 | 25 | 27 | 28 | 28 | 26 |
Feels °C | 26 | 25 | 28 | 24 | 21 | 20 | 24 | 25 | 26 | 27 | 25 | 24 | 24 | 23 | 22 | 25 | 28 | 30 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 5 | SSW 6 | SSW 6 | SSW 10 | SSW 10 | SSE 5 | SSE 5 | SSE 6 | S 6 | S 6 | SSW 10 | SSW 10 | SSW 10 | S 10 | S 9 | SSW 9 |
| kJ | 64 | 64 | 62 | 59 | 37 | 45 | 37 | 106 | 59 | 23 | 22 | 24 | 23 | 15 | 38 | 38 | 38 | 47 | 45 | 29 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 11 | E 11 | SE 13 | SSW 10 | SSW 10 | SSW 10 | SE 13 | SE 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | S 5 | S 5 | S 5 | E 10 | E 10 | S 12 |
| kJ | 3 | 2 | 2 | 6 | 58 | 58 | 58 | 6 | 4 | 59 | 40 | 40 | 39 | 38 | 9 | 5 | 4 | 2 | 2 | 11 |
Swell 3 Height (m) Direction Period (s) | SE 13 | SE 13 | SE 13 | E 11 | SE 13 | SE 10 | SE 10 | SE 10 | SE 13 | SE 12 | SE 10 | SE 12 | SE 12 | SE 12 | SE 11 | SE 11 | E 10 | SE 12 | SE 12 | SE 12 |
| kJ | 6 | 6 | 6 | 2 | 6 | 4 | 4 | 4 | 7 | 6 | 4 | 5 | 5 | 5 | 5 | 5 | 2 | 5 | 5 | 5 |
Wind waves Height (m) Direction Period (s) | — | SSW 3 | SW 4 | SSW 4 | SSW 6 | — | — | ESE 2 | SSE 5 | ESE 5 | E 6 | — | — | — | NNE 2 | NE 2 | NNE 2 | — | — | — |
| kJ | — | 4 | 12 | 25 | 93 | — | — | 1 | 14 | 42 | 16 | — | — | — | 1 | 1 | 1 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 72 | 38 | 10 | 38 | 136 | 77 | 64 | 0 | 470 | 0 | 0 | 0 | 0 | 0 | 0 | 38 | 38 | 0 | 0 | 38 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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