Surf Forecasts:
How big are the waves at Rock Island today (21 Oct):
- Morning surf: Morning surf (21 Oct, local time) - 2.5ft (0.7m), 15s period with S swell.
- Afternoon surf: Afternoon surf (21 Oct, local time) - 6ft (1.9m), 6s period with SSW swell.
- Evening surf: Evening surf (21 Oct, local time) - 3.5ft (1.0m), 14s period with S swell.
The current surf forecast for Rock Island at 5AM is: 0.6m 16s primary swell from a South direction and 0.7m 12s secondary swell from a South-southeast direction, 1.3m 5s secondary swell from a South-southwest direction (forecast issued at 02:00am October 21). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Oct) | 2.5ft (0.7m) | 15s |
| Afternoon (21 Oct) | 6ft (1.9m) | 6s |
| Evening (21 Oct) | 3.5ft (1.0m) | 14s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 26°C on Wed morning, min 16°C on Thu night). Winds decreasing (strong winds from the SW on Wed afternoon, calm by Fri night). | ||||||||||||||||||||||||
Wednesday 21 | Thursday 22 | Friday 23 | ||||||||||||||||||||||
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) | SSE 13 | SSE 12 | S 16 | S 15 | S 14 | SSW 6 | SSW 7 | S 14 | S 17 | S 14 | S 16 | S 15 | S 14 | S 14 | S 13 | S 13 | S 14 | S 13 | S 13 | S 13 | S 13 | S 14 | S 14 | SSW 14 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 189 | 167 | 172 | 210 | 260 | 300 | 372 | 416 | 302 | 394 | 701 | 283 | 691 | 515 | 499 | 268 | 485 | 268 | 423 | 268 | 335 | 501 | 508 | 351 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | on | on | on | on | cross-on | off | off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off |
High Tide | 11:27PM1.21m | 2:18PM1.34m | 1:20AM1.24m | 2:50PM1.37m | 2:38AM1.31m | 3:17PM1.40m | ||||||||||||||||||
Low Tide | 6:55AM0.51m | 8:07PM0.93m | 8:02AM0.54m | 8:51PM0.77m | 8:56AM0.57m | |||||||||||||||||||
 |  |  | |  | |  | | | | | |  | | | | | | | | | | | | |
 | — | 5:52 | — | — | — | — | — | — | — | 5:52 | — | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — |
 | — | — | — | — | — | 5:00 | — | — | — | — | — | — | — | 4:59 | — | — | — | — | — | — | — | 4:58 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 24 | 24 | 25 | 26 | 26 | 25 | 25 | 25 | 24 | 22 | 22 | 20 | 20 | 18 | 18 | 17 | 16 | 16 | 16 | 17 | 19 | 19 | 19 |
Feels °C | 25 | 23 | 21 | 23 | 22 | 21 | 20 | 20 | 20 | 22 | 19 | 16 | 15 | 15 | 13 | 13 | 13 | 12 | 11 | 12 | 15 | 17 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | SSE 13 | SSE 12 | SSE 12 | S 15 | S 14 | S 14 | S 14 | S 14 | S 14 | SSW 7 | S 16 | S 13 | S 14 | S 14 | S 13 | S 13 | S 14 | S 13 | S 13 | S 13 | S 13 | S 14 | S 14 | SSW 14 |
| kJ | 189 | 167 | 125 | 210 | 260 | 184 | 297 | 416 | 249 | 154 | 701 | 212 | 691 | 515 | 499 | 268 | 485 | 268 | 423 | 268 | 335 | 501 | 508 | 351 |
Swell 2 Height (m) Direction Period (s) | S 17 | S 16 | S 16 | SSE 12 | SSE 11 | S 18 | S 18 | S 18 | S 17 | S 14 | SSW 6 | S 15 | SW 7 | SSW 17 | SSW 16 | SSW 15 | ESE 10 | SSW 15 | SE 9 | SSW 16 | SSW 16 | SSW 15 | SE 8 | SE 8 |
| kJ | 93 | 130 | 172 | 79 | 70 | 159 | 169 | 238 | 297 | 394 | 75 | 283 | 12 | 216 | 333 | 184 | 9 | 179 | 64 | 144 | 103 | 353 | 95 | 23 |
Swell 3 Height (m) Direction Period (s) | — | — | S 12 | — | S 18 | SSE 11 | — | SE 10 | SSE 11 | S 17 | SSE 7 | SSW 7 | SW 7 | SE 10 | SE 10 | SE 10 | ESE 8 | ESE 9 | ESE 9 | ESE 10 | — | — | SE 10 | SE 8 |
| kJ | — | — | 75 | — | 226 | 46 | — | 47 | 37 | 270 | 30 | 41 | 37 | 45 | 45 | 45 | 19 | 8 | 53 | 9 | — | — | 26 | 32 |
Wind waves Height (m) Direction Period (s) | S 6 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | SSW 7 | SSW 7 | SW 7 | — | — | NE 3 | ENE 3 | ENE 3 | E 3 | ENE 4 | ENE 4 | NE 3 | NE 3 | — | ESE 8 | — | — |
| kJ | 41 | 59 | 122 | 148 | 255 | 300 | 372 | 336 | 302 | 244 | — | — | 5 | 6 | 6 | 5 | 14 | 13 | 2 | 2 | — | 105 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 14 | 14 | 14 | 491 | 491 | 491 | 491 | 491 | 470 | 487 | 488 | 10 | 55 | 38 | 552 | 142 | 552 | 228 | 0 | 27 | 488 | 12 | 0 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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