Surf Forecasts:
How big are the waves at Rock Island today (15 Aug):
- Morning surf: Morning surf (15 Aug, local time) - 1.5ft (0.4m), 11s period with SSW swell.
- Afternoon surf: Afternoon surf (15 Aug, local time) - 2.5ft (0.8m), 10s period with ESE swell.
- Evening surf: Evening surf (15 Aug, local time) - 2.5ft (0.8m), 11s period with SE swell.
The current surf forecast for Rock Island at 2AM is: 0.3m 11s primary swell from a South-southwest direction and 0.3m 9s secondary swell from a South direction, 0.4m 5s secondary swell from a Southeast direction (forecast issued at 08:00pm August 14). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Aug) | 1.5ft (0.4m) | 11s |
| Afternoon (15 Aug) | 2.5ft (0.8m) | 10s |
| Evening (15 Aug) | 2.5ft (0.8m) | 11s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 23mm), heaviest during Fri night. Warm (max 29°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | ||||||||||||||||
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 9 | SSW 9 | SSE 10 | SSW 11 | ESE 6 | SSW 11 | SSW 11 | ESE 10 | SSW 10 | SE 11 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SE 9 | S 9 | S 9 |
Wave Graph  | ||||||||||||||||||
 kJ | 16 | 16 | 20 | 25 | 44 | 40 | 37 | 120 | 33 | 134 | 28 | 27 | 27 | 28 | 27 | 50 | 38 | 39 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off |
High Tide | 6:31PM1.48m | 5:41AM1.56m | 6:55PM1.48m | 6:26AM1.55m | 7:18PM1.48m | |||||||||||||
Low Tide | 00:00AM0.78m | 12:23PM0.24m | 00:35AM0.68m | 12:57PM0.34m | ||||||||||||||
 |  | |  | |  |  | | |  |  | | | | |  | | | |
 | — | — | — | 5:00 | — | — | — | — | — | — | — | 5:01 | — | — | — | — | — | — |
 | 6:31 | — | — | — | — | — | — | — | 6:30 | — | — | — | — | — | — | — | 6:30 | — |
mm | 3 | 4 | 5 | 6 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 26 | 25 | 25 | 26 | 28 | 29 | 27 | 26 | 25 | 24 | 24 | 25 | 27 | 28 | 27 | 25 |
Feels °C | 29 | 31 | 29 | 27 | 27 | 28 | 29 | 31 | 28 | 27 | 27 | 25 | 25 | 26 | 29 | 30 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 9 | SSW 9 | SSW 11 | SE 5 | SE 5 | SSW 11 | SE 8 | SSW 10 | SE 8 | SSE 8 | SE 8 | SSW 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 |
| kJ | 16 | 16 | 16 | 25 | 13 | 10 | 37 | 33 | 33 | 32 | 24 | 14 | 27 | 28 | 27 | 39 | 38 | 39 |
Swell 2 Height (m) Direction Period (s) | S 9 | SSE 11 | SSE 10 | S 9 | SSW 11 | SSW 11 | SE 6 | S 10 | SE 10 | SSW 10 | SSW 9 | SSW 9 | SE 7 | SE 7 | SE 7 | SSE 11 | SSE 11 | SE 11 |
| kJ | 6 | 11 | 20 | 14 | 40 | 40 | 9 | 52 | 4 | 31 | 28 | 27 | 14 | 14 | 13 | 12 | 12 | 19 |
Swell 3 Height (m) Direction Period (s) | SE 11 | S 8 | S 12 | SSW 8 | SSE 9 | SSE 9 | SSE 9 | SE 10 | SE 12 | SE 10 | SE 12 | SSE 12 | SSE 12 | SSE 12 | SSE 11 | E 10 | SE 9 | E 9 |
| kJ | 5 | 5 | 11 | 7 | 16 | 16 | 15 | 4 | 6 | 4 | 6 | 14 | 14 | 14 | 13 | 2 | 3 | 1 |
Wind waves Height (m) Direction Period (s) | SE 6 | SE 6 | SE 4 | SE 5 | ESE 6 | — | — | ESE 10 | SE 8 | SE 11 | — | — | — | — | — | SE 9 | — | — |
| kJ | 5 | 9 | 5 | 13 | 44 | — | — | 120 | 33 | 134 | — | — | — | — | — | 50 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 64 | 38 | 0 | 0 | 0 | 0 | 0 | 64 | 64 | 8 | 0 | 0 | 0 | 0 | 0 | 6 | 38 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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