Surf Forecasts:
How big are the waves at Rock Island today (13 Aug):
- Morning surf: Morning surf (13 Aug, local time) - 1.5ft (0.4m), 10s period with SSW swell.
- Afternoon surf: Afternoon surf (13 Aug, local time) - 1.5ft (0.5m), 10s period with S swell.
- Evening surf: Evening surf (13 Aug, local time) - 1.5ft (0.4m), 9s period with SSW swell.
The current surf forecast for Rock Island at 9AM is: 0.4m 10s primary swell from a South-southwest direction and 0.2m 4s secondary swell from a South-southeast direction (forecast issued at 02:00am August 13). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Aug) | 1.5ft (0.4m) | 10s |
| Afternoon (13 Aug) | 1.5ft (0.5m) | 10s |
| Evening (13 Aug) | 1.5ft (0.4m) | 9s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 37mm), heaviest during Thu night. Warm (max 29°C on Thu afternoon, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||||||||||
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 | S 10 | SSW 10 | S 10 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | ESE 10 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | ESE 9 | SE 10 | SSW 10 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 39 | 38 | 50 | 38 | 49 | 47 | 45 | 29 | 28 | 28 | 28 | 16 | 28 | 29 | 29 | 16 | 88 | 25 | 40 | 40 | 37 | 121 | 151 | 32 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | cross-off | glassy | cross | cross-off | off | off | off | off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off |
High Tide | 4:05AM1.50m | 6:08PM1.47m | 4:55AM1.54m | 6:31PM1.48m | 5:41AM1.56m | 6:55PM1.48m | ||||||||||||||||||
Low Tide | 10:48PM0.99m | 11:12AM0.14m | 11:25PM0.88m | 11:48AM0.17m | 00:00AM0.78m | 12:23PM0.24m | ||||||||||||||||||
 |  |  |  |  | | | | | | | | | | | | | | | | |  | |  | |
 | — | 4:58 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — | — | 5:00 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:34 | — | — | — | — | — | — | — | 6:31 | — | — | — | — | — | — | — | 6:30 | — |
mm | 1 | — | — | — | 1 | 2 | 2 | 5 | 3 | 1 | — | 1 | 1 | — | 3 | 5 | 3 | 4 | 4 | — | 1 | 1 | — | — |
Temp °C | 25 | 25 | 24 | 26 | 27 | 29 | 28 | 27 | 26 | 26 | 25 | 26 | 27 | 28 | 28 | 27 | 26 | 26 | 25 | 26 | 27 | 29 | 27 | 25 |
Feels °C | 27 | 26 | 23 | 26 | 28 | 33 | 31 | 30 | 28 | 27 | 25 | 27 | 28 | 30 | 30 | 30 | 29 | 28 | 26 | 27 | 27 | 30 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | SSW 10 | S 10 | SSW 10 | S 10 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSE 10 | SSW 11 | SSW 11 | SSW 11 | SE 8 | SE 8 | SE 8 |
| kJ | 39 | 38 | 50 | 38 | 49 | 47 | 45 | 29 | 28 | 28 | 28 | 16 | 28 | 29 | 29 | 16 | 16 | 18 | 40 | 40 | 37 | 32 | 33 | 32 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | SSE 5 | SE 11 | SSE 4 | E 10 | E 10 | SE 10 | SE 12 | ESE 9 | ESE 9 | ESE 10 | S 12 | ESE 6 | ESE 6 | S 8 | SE 5 | SSE 10 | SSW 11 | SE 5 | SE 5 | SE 6 | SSW 10 | SSW 10 | SSW 10 |
| kJ | 7 | 7 | 5 | 2 | 2 | 2 | 4 | 5 | 8 | 7 | 9 | 11 | 4 | 6 | 6 | 4 | 20 | 25 | 9 | 10 | 8 | 34 | 33 | 31 |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 12 | SE 4 | SE 11 | SE 11 | SE 12 | S 12 | SE 9 | S 12 | S 12 | S 12 | SE 7 | SE 11 | SE 11 | SE 11 | SSE 11 | SE 6 | SSW 8 | SSE 9 | SSE 9 | SSE 8 | ESE 10 | SE 10 | ESE 10 |
| kJ | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 11 | 11 | 11 | 2 | 5 | 5 | 5 | 11 | 5 | 7 | 16 | 16 | 13 | 10 | 4 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | NNE 2 | NE 3 | NE 3 | — | SE 3 | — | — | — | — | — | ENE 2 | — | SE 5 | — | ESE 10 | SE 5 | — | — | — | ESE 9 | SE 10 | — |
| kJ | — | — | 1 | 2 | 1 | — | 2 | — | — | — | — | — | 1 | — | 4 | — | 88 | 3 | — | — | — | 121 | 151 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 38 | 38 | 38 | 0 | 17 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 64 | 64 | 0 | 0 | 7 | 17 | 54 | 491 | 491 | 38 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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