Surf Forecasts:
How big are the waves at Rock Island today (12 Sep):
- Morning surf: Morning surf (12 Sep, local time) - 1.5ft (0.4m), 7s period with SSW swell.
- Afternoon surf: Afternoon surf (12 Sep, local time) - 1.5ft (0.4m), 7s period with SSW swell.
- Evening surf: Evening surf (12 Sep, local time) - 1ft (0.3m), 7s period with SSW swell.
The current surf forecast for Rock Island at 5AM is: 0.4m 8s primary swell from a South-southwest direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 08:00pm September 11). An open ocean swell of 0.4m 2s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Sep) | 1.5ft (0.4m) | 7s |
| Afternoon (12 Sep) | 1.5ft (0.4m) | 7s |
| Evening (12 Sep) | 1ft (0.3m) | 7s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 21mm), heaviest during Fri night. Warm (max 27°C on Mon morning, min 20°C on Fri night). Winds increasing (calm on Sun afternoon, fresh winds from the S by Mon afternoon). | ||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | ||||||||||||||||
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 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 9 | SE 8 | SE 8 |
Wave Graph  | ||||||||||||||||||
 kJ | 28 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 10 | 9 | 9 | 9 | 5 | 5 | 12 | 19 | 18 | 16 |
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 | glassy | on | on |
High Tide | 5:19PM1.47m | 4:56AM1.56m | 5:41PM1.48m | 5:41AM1.58m | 6:03PM1.50m | |||||||||||||
Low Tide | 11:01PM0.69m | 11:24AM0.37m | 11:34PM0.56m | 11:58AM0.45m | ||||||||||||||
 |  | | |  | | |  | | | | | | |  | |  | | |
 | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:22 | — | — | — | — | — | — |
 | — | — | — | — | — | — | — | 5:53 | — | — | — | — | — | — | — | 5:52 | — | — |
mm | — | 2 | 4 | 5 | 5 | 4 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 24 | 24 | 24 |
Feels °C | 20 | 21 | 21 | 20 | 20 | 20 | 19 | 21 | 23 | 23 | 23 | 24 | 23 | 23 | 26 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 9 | SE 8 | SE 8 |
| kJ | 28 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 10 | 9 | 9 | 9 | 5 | 5 | 12 | 19 | 18 | 16 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SSE 7 | SSW 7 | SSW 7 | SSW 7 | SW 7 |
| kJ | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 5 | 2 |
Swell 3 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | E 14 | E 14 | SE 10 | E 13 | E 13 | SE 7 | SE 7 | SE 9 | E 12 | E 13 | E 13 | E 13 |
| kJ | 1 | 1 | 1 | 1 | 1 | 1 | 4 | 4 | 4 | 3 | 4 | 2 | 2 | 3 | 3 | 3 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 2 | NE 3 | NNE 3 | NNE 3 | NNE 2 | NNE 2 | NNE 2 | NNE 2 | — | — | — | — | — | — | — |
| kJ | — | — | — | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 51 | 51 | 51 | 55 | 51 | 51 | 54 | 54 | 51 | 51 | 38 | 38 | 38 | 16 | 16 | 16 | 51 | 51 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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