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:
Mera surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 am Thursday 11 Dec 2025 JSTForecast update in hr min s Forecast update imminent
Mera surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mera sea temperature is
21.1° C
(Which is 1.3°C warmer than normal for this time of year)How big are the waves at Mera today?
The current surf forecast for Mera at 1PM is: 0.6m 10s primary swell from a East-southeast direction and 0.5m 5s secondary swell from a East direction, 0.2m 4s secondary swell from a West direction (forecast issued at 08:00am December 11). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 2ft (0.6m) | 10s |
| Afternoon (11 Dec) | 2ft (0.6m) | 10s |
| Evening (11 Dec) | 7.5ft (2.3m) | 6s |
Table - waves today at Mera. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | Sun 14 | |||||||||||||||||||||
| 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 10 | 10 | 5 | 6 | 7 | 7 | 7 | 8 | 8 | 10 | 10 | 12 | 12 | 11 | 11 | 11 | 14 | 12 | 12 | 12 | 6 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 133 | 77 | 74 | 74 | 153 | 397 | 704 | 618 | 207 | 117 | 98 | 56 | 56 | 146 | 139 | 127 | 89 | 86 | 61 | 132 | 136 | 97 | 90 | 89 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | on | on | on | on | cross- on | cross | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | off | off | cross- off | cross- off | off | cross- off |
High Tide / height (m) | 9:55AM 1.23 | 8:19PM 1.13 | 10:35AM 1.22 | 10:07PM 1.01 | 11:14AM 1.23 | 12:18AM 0.99 | ||||||||||||||||||
Low Tide / height (m) | 3:18PM 0.90 | 3:26AM 0.46 | 4:51PM 0.81 | 4:19AM 0.62 | 6:18PM 0.67 | |||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | Sun 14 | |||||||||||||||||||||
| Sunrise | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:29 | - | - | - | - | - | - | - | 4:29 | - | - | - | - | - | - | - | 4:29 | - | - | - | - |
 |  |  |  |  | | | |  | | | | | | | | | | |  |  | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 2 | 3 | 6 | 4 |
| Temp. °C | 12 | 12 | 14 | 15 | 16 | 17 | 16 | 14 | 9 | 7 | 8 | 8 | 7 | 6 | 6 | 6 | 5 | 6 | 7 | 8 | 10 | 13 | 10 | 8 |
| Feels °C (?) | 8 | 10 | 10 | 5 | 6 | 6 | 3 | 8 | -3 | -4 | -2 | -2 | -3 | -4 | -2 | -1 | -2 | 0 | 2 | 2 | 5 | 10 | 5 | 0 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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