Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Valnäs - Nord Koster surfForecast / Kattegat and Skagerrack / Sweden
48hr Weather and Surf, issued 6 am Tuesday 16 Dec 2025 CETForecast update in hr min s Forecast update imminent
Valnäs - Nord Koster surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Valnäs - Nord Koster sea temperature is
7.6° C
(Which is 2.1°C warmer than normal for this time of year)| Time (CET) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Dec) | - | - |
| Afternoon (16 Dec) | - | - |
| Evening (16 Dec) | 2ft (0.6m) | 8s |
Table - waves today at Valnäs - Nord Koster. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 7 | 7 | 7 | 6 | 6 | 8 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 7 | 7 | 8 | 8 | 7 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 0 | 0 | 0 | 0 | 0 | 37 | 0 | 0 | 0 | 91 | 0 | 45 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 217 | 186 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- on | cross- off | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- off | cross- off | cross- off |
High Tide / height (m) | 2:14AM 0.24 | 2:33PM 0.29 | 2:53AM 0.25 | 3:15PM 0.30 | 3:32AM 0.26 | 3:57PM 0.31 | ||||||||||||||||||
Low Tide / height (m) | 7:48AM 0.05 | 8:33PM 0.06 | 8:24AM 0.06 | 9:05PM 0.07 | 9:00AM 0.06 | 9:38PM 0.09 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| Sunrise | - | - | 9:03 | - | - | - | - | - | - | - | 9:03 | - | - | - | - | - | - | - | 9:04 | - | - | - | - | - |
| Sunset | - | - | - | 3:18 | - | - | - | - | - | - | - | 3:18 | - | - | - | - | - | - | - | 3:18 | - | - | - | - |
 | |  | | |  | | | | |  | |  | | | | | |  | | |  | | | |
Rain (mm) | - | - | - | - | - | 1 | 1 | 3 | 1 | - | - | - | - | - | - | - | - | - | 1 | 2 | - | - | - | 2 |
| Temp. °C | 8 | 8 | 8 | 7 | 8 | 7 | 7 | 7 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 7 | 7 |
| Feels °C (?) | 0 | 0 | 0 | 0 | 1 | 0 | -2 | -2 | 1 | 4 | 2 | 1 | -1 | -1 | 1 | -1 | -1 | -2 | -4 | -4 | 0 | 1 | 0 | -4 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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