Surf Forecasts:
How big are the waves at Rock Island today (11 Aug):
- Morning surf: Morning surf (11 Aug, local time) - 1.5ft (0.5m), 10s period with SSW swell.
- Afternoon surf: Afternoon surf (11 Aug, local time) - 2.5ft (0.8m), 11s period with SSW swell.
- Evening surf: Evening surf (11 Aug, local time) - 3.5ft (1.1m), 5s period with SSW swell.
The current surf forecast for Rock Island at 7AM is: 0.5m 10s primary swell from a South-southwest direction and 0.1m 11s secondary swell from a East direction (forecast issued at 02:00am August 11). An open ocean swell of 0.3m 2s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Aug) | 1.5ft (0.5m) | 10s |
| Afternoon (11 Aug) | 2.5ft (0.8m) | 11s |
| Evening (11 Aug) | 3.5ft (1.1m) | 5s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 38mm), heaviest during Tue night. Warm (max 28°C on Thu afternoon, min 21°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||||||||||
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 10 | SSW 10 | SSW 10 | SSW 10 | SSW 11 | SSW 11 | SSW 10 | SSW 5 | SSW 10 | S 5 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | S 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 59 | 58 | 58 | 62 | 64 | 143 | 62 | 56 | 58 | 65 | 58 | 58 | 59 | 59 | 40 | 40 | 39 | 38 | 38 | 50 | 38 | 31 | 29 | 29 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | cross | on | on | on | on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off |
High Tide | 2:03AM1.40m | 5:17PM1.41m | 3:09AM1.45m | 5:43PM1.45m | 4:05AM1.50m | 6:08PM1.47m | ||||||||||||||||||
Low Tide | 9:16PM1.16m | 9:46AM0.18m | 10:08PM1.08m | 10:31AM0.14m | 10:48PM0.99m | 11:12AM0.14m | ||||||||||||||||||
 | |  |  | |  | |  |  | | |  | | | | |  | | |  |  | | |  | |
 | — | 4:56 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:36 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:34 | — |
mm | — | — | — | — | — | 1 | 2 | 8 | 3 | 2 | 3 | 8 | 1 | — | — | — | 1 | 1 | 1 | 1 | — | 1 | 1 | 2 |
Temp °C | 24 | 24 | 24 | 25 | 26 | 26 | 25 | 23 | 23 | 22 | 21 | 21 | 22 | 23 | 24 | 24 | 24 | 23 | 23 | 24 | 27 | 28 | 28 | 26 |
Feels °C | 23 | 24 | 24 | 26 | 26 | 24 | 24 | 20 | 21 | 20 | 21 | 23 | 23 | 23 | 23 | 23 | 22 | 21 | 22 | 23 | 28 | 30 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 11 | E 11 | SSW 10 | SE 13 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSE 5 | SSW 10 | S 6 | S 6 | S 6 | SSW 10 | SSW 10 | S 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 |
| kJ | 59 | 58 | 58 | 62 | 64 | 2 | 62 | 6 | 58 | 58 | 58 | 58 | 15 | 59 | 25 | 27 | 18 | 38 | 38 | 50 | 38 | 31 | 29 | 29 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | E 11 | E 11 | E 12 | SE 13 | E 11 | E 11 | SE 13 | SE 13 | SE 13 | SE 13 | SSW 10 | SE 6 | SSW 10 | SSW 10 | SSW 10 | S 6 | S 6 | SE 11 | S 5 | E 9 | E 9 | SE 12 |
| kJ | 9 | 9 | 2 | 9 | 3 | 6 | 2 | 2 | 6 | 7 | 7 | 6 | 59 | 11 | 40 | 40 | 39 | 10 | 5 | 5 | 2 | 2 | 2 | 5 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 13 | SE 13 | SE 12 | SE 13 | S 10 | SE 13 | S 10 | E 11 | S 10 | S 10 | SE 10 | SE 10 | S 5 | SE 10 | SE 12 | SE 12 | SE 12 | SE 11 | — | SE 11 | SE 12 | SE 12 | SE 9 |
| kJ | 5 | 7 | 7 | 6 | 6 | 2 | 6 | 2 | 2 | 2 | 2 | 4 | 4 | 8 | 4 | 5 | 5 | 5 | 5 | — | 5 | 5 | 5 | 3 |
Wind waves Height (m) Direction Period (s) | ENE 3 | NE 3 | NE 2 | — | — | SSW 11 | SW 4 | SSW 5 | S 5 | S 5 | SSE 5 | SSE 5 | — | SE 5 | — | — | — | — | NNE 2 | NNE 2 | NNE 2 | — | — | — |
| kJ | 1 | 1 | 1 | — | — | 143 | 26 | 56 | 55 | 65 | 48 | 30 | — | 29 | — | — | — | — | 1 | 1 | 1 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 38 | 0 | 0 | 10 | 14 | 514 | 27 | 136 | 104 | 228 | 38 | 0 | 0 | 10 | 0 | 0 | 0 | 54 | 51 | 0 | 16 | 38 | 38 | 38 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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