Surf Forecasts:
How big are the waves at Rock Island today (04 Aug):
- Morning surf: Morning surf (04 Aug, local time) - 4.5ft (1.4m), 17s period with SE swell.
- Afternoon surf: Afternoon surf (04 Aug, local time) - 5.5ft (1.7m), 16s period with SE swell.
- Evening surf: Evening surf (04 Aug, local time) - 6.5ft (2.0m), 16s period with SE swell.
The current surf forecast for Rock Island at 3AM is: 1.2m 16s primary swell from a Southeast direction and 0.1m 14s secondary swell from a East direction (forecast issued at 08:00pm August 03). An open ocean swell of 0.6m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (04 Aug) | 4.5ft (1.4m) | 17s |
| Afternoon (04 Aug) | 5.5ft (1.7m) | 16s |
| Evening (04 Aug) | 6.5ft (2.0m) | 16s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 30°C on Thu morning, min 22°C on Mon night). Winds decreasing (fresh winds from the NNE on Wed morning, light winds from the NE by Thu morning). | ||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||||
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) | SE 17 | SE 18 | SE 17 | SE 16 | SE 16 | SE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 15 |
Wave Graph  | ||||||||||||||||||
 kJ | 505 | 686 | 671 | 765 | 966 | 1094 | 1245 | 1474 | 1697 | 2003 | 2269 | 2291 | 2441 | 2948 | 3294 | 3142 | 3184 | 2822 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | cross-off | cross-off | cross-off | off | off | off | off | off | off | off | cross-off | cross-off |
High Tide | 8:21PM1.45m | 8:29AM1.35m | 8:48PM1.44m | 9:29AM1.26m | ||||||||||||||
Low Tide | 2:29AM0.59m | 2:32PM0.59m | 3:17AM0.54m | 3:04PM0.75m | ||||||||||||||
 |  |  |  |  |  | | | | | | | | | | | | | |
 | — | — | — | 4:52 | — | — | — | — | — | — | — | 4:52 | — | — | — | — | — | — |
 | 6:44 | — | — | — | — | — | — | — | 6:43 | — | — | — | — | — | — | — | 6:42 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 23 | 23 | 22 | 24 | 26 | 27 | 26 | 24 | 23 | 23 | 23 | 23 | 25 | 28 | 28 | 26 |
Feels °C | 23 | 22 | 20 | 20 | 19 | 20 | 22 | 24 | 23 | 22 | 20 | 20 | 20 | 19 | 23 | 28 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SE 17 | SE 18 | SE 17 | SE 16 | SE 16 | SE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 15 |
| kJ | 505 | 686 | 671 | 765 | 966 | 1094 | 1245 | 1474 | 1697 | 2003 | 2269 | 2291 | 2441 | 2948 | 3294 | 3142 | 3184 | 2822 |
Swell 2 Height (m) Direction Period (s) | — | E 14 | E 14 | E 14 | E 14 | E 14 | — | E 13 | E 13 | — | — | NE 13 | — | — | — | — | — | — |
| kJ | — | 4 | 4 | 4 | 4 | 4 | — | 3 | 3 | — | — | 7 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 3 | NE 3 | NE 3 | NE 3 | NNE 3 | NNE 3 | NE 3 | — | — | — | — | NNE 3 | NNE 3 | NNE 4 | NNE 4 | — | — | — |
| kJ | 6 | 7 | 7 | 7 | 7 | 7 | 7 | — | — | — | — | 8 | 8 | 34 | 32 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 145 | 145 | 488 | 145 | 145 | 491 | 145 | 38 | 491 | 491 | 491 | 488 | 488 | 488 | 488 | 0 | 12 | 6 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
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