Surf Forecasts:
How big are the waves at Rock Island today (20 Oct):
- Morning surf: Morning surf (20 Oct, local time) - 1.5ft (0.4m), 14s period with SE swell.
- Afternoon surf: Afternoon surf (20 Oct, local time) - 4ft (1.2m), 6s period with SSW swell.
- Evening surf: Evening surf (20 Oct, local time) - 2.5ft (0.8m), 13s period with SSE swell.
The current surf forecast for Rock Island at 4AM is: 0.3m 16s primary swell from a South-southeast direction and 0.7m 5s secondary swell from a South direction, 0.5m 4s secondary swell from a Southwest direction (forecast issued at 08:00pm October 19). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Oct) | 1.5ft (0.4m) | 14s |
| Afternoon (20 Oct) | 4ft (1.2m) | 6s |
| Evening (20 Oct) | 2.5ft (0.8m) | 13s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 27°C on Tue afternoon, min 18°C on Thu afternoon). Winds increasing (light winds from the W on Tue night, strong winds from the SW by Wed night). | ||||||||||||||||||
Mon 19 | Tuesday 20 | Wednesday 21 | ||||||||||||||||
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 5 | SSW 5 | SSW 5 | SSE 16 | SSE 17 | SE 14 | SSW 5 | SSW 6 | SSE 13 | SSE 13 | SSE 13 | SSE 12 | S 16 | S 15 | SSW 6 | SSW 6 | SSW 7 | S 17 |
Wave Graph  | ||||||||||||||||||
 kJ | 61 | 53 | 44 | 50 | 55 | 52 | 84 | 97 | 156 | 195 | 189 | 167 | 172 | 210 | 203 | 300 | 349 | 476 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | on | on | on | on | on | on |
High Tide | 9:24PM1.27m | 1:37PM1.31m | 11:27PM1.21m | 2:18PM1.34m | ||||||||||||||
Low Tide | 5:05PM1.16m | 5:37AM0.46m | 7:03PM1.07m | 6:55AM0.51m | 8:07PM0.93m | |||||||||||||
 | |  |  |  |  | | | | | | |  | | | | | | |
 | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:52 | — | — | — | — | — | — |
 | — | — | — | — | — | — | — | 5:00 | — | — | — | — | — | — | — | 5:00 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 23 | 23 | 23 | 23 | 24 | 26 | 27 | 25 | 25 | 23 | 24 | 24 | 25 | 26 | 26 | 26 | 25 |
Feels °C | 21 | 21 | 21 | 23 | 23 | 23 | 24 | 25 | 25 | 26 | 25 | 24 | 22 | 23 | 22 | 22 | 22 | 20 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SSE 9 | SE 9 | S 5 | S 5 | SE 14 | SE 13 | SSE 12 | S 6 | S 6 | SSE 13 | SSE 12 | SSE 12 | S 15 | S 14 | S 14 | S 14 | S 17 |
| kJ | 4 | 8 | 12 | 26 | 27 | 50 | 40 | 57 | 71 | 43 | 189 | 167 | 125 | 210 | 203 | 184 | 297 | 476 |
Swell 2 Height (m) Direction Period (s) | SE 16 | SSE 16 | SSE 15 | SSE 16 | SSE 17 | SSE 16 | SSE 15 | SSE 15 | SSE 13 | SSE 13 | S 6 | S 16 | S 16 | SSE 12 | SSE 11 | S 19 | S 18 | S 13 |
| kJ | 10 | 24 | 21 | 50 | 55 | 52 | 45 | 71 | 156 | 195 | 31 | 130 | 172 | 121 | 70 | 170 | 240 | 166 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SSE 15 | S 18 | SE 8 | SSE 13 | SSE 16 | — | — | S 19 | S 18 | S 17 | — | S 12 | — | S 19 | SSE 11 | — | SSE 10 |
| kJ | 2 | 21 | 24 | 11 | 17 | 51 | — | — | 30 | 57 | 93 | — | 75 | — | 112 | 46 | — | 36 |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 5 | SSW 5 | SW 4 | SW 4 | SSW 6 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 5 | SSW 5 | SSW 5 | SSW 5 | SSW 6 | SSW 6 | SSW 7 | SSW 7 |
| kJ | 61 | 53 | 44 | 10 | 26 | 40 | 84 | 97 | 93 | 43 | 42 | 30 | 56 | 92 | 201 | 300 | 349 | 431 |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 491 | 27 | 27 | 10 | 14 | 92 | 92 | 491 | 14 | 12 | 10 | 27 | 136 | 491 | 518 | 491 | 470 | 487 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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