Waves in Attu Station
Hourly wave forecast for 7 days · updated today, Wednesday, October 28, at 5:40 pm (HADT)- Sea state
- Rough · Douglas 5
- Period
- 7.7 s · S
- Swell
- 4.4 ft · 8 s
- Highest expected
- 20 ft
Today the sea at Attu Station is rough: 10 ft waves with a period of 7.7 s from the south. The swell, 4.4 ft at 8 s, comes from the south-southeast. Biggest waves: Thursday 29, with waves up to 18 ft (very rough).
Wave height, next 7 days
Significant height: the average of the highest third of the waves, what an observer would estimate by eye. Swell: waves arriving from far away, longer.
The waves you may find today
- Most common5.0 ft
- Significant10 ft
- Highest expected20 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 20 ft. Before heading out, expect waves of up to 20 ft.
The Douglas sea state scale
| Degree | Name | Wave height |
|---|---|---|
| 0 | Calm (glassy) | 0 |
| 1 | Calm (rippled) | 0.0 ft–0.3 ft |
| 2 | Smooth | 0.3 ft–1.6 ft |
| 3 | Slight | 1.6 ft–4.1 ft |
| 4 | Moderate | 4.1 ft–8.2 ft |
| 5 | Rough · today | 8.2 ft–13.1 ft |
| 6 | Very rough · week peak | 13.1 ft–19.7 ft |
| 7 | High | 19.7 ft–29.5 ft |
| 8 | Very high | 29.5 ft–45.9 ft |
Waves day by day
| Day | Max wave | Sea state | Direction | Max period | Swell | Max wind |
|---|---|---|---|---|---|---|
| Today | 11 ft | Rough | S | 9 s | 8.2 ft S | 40 mph SSE |
| Thu 29 | 18 ft | Very rough | SSW | 14 s | 16 ft SSW | 31 mph WNW |
| Fri 30 | 13 ft | Very rough | SW | 12 s | 12 ft SW | 30 mph W |
| Sat 31 | 11 ft | Rough | SSW | 9 s | 8.7 ft SW | 33 mph SSW |
| Sun 1 | 11 ft | Rough | SSW | 10 s | 10 ft SSW | 29 mph SW |
| Mon 2 | 17 ft | Very rough | SW | 12 s | 12 ft SW | 46 mph W |
| Tue 3 | 13 ft | Rough | SW | 11 s | 11 ft SW | 28 mph NNW |
Today, every 3 hours
| Time | 12:00 am | 3:00 am | 6:00 am | 9:00 am | 12:00 pm | 3:00 pm | 6:00 pm | 9:00 pm |
|---|---|---|---|---|---|---|---|---|
| Waves | 7.6 ft | 7.0 ft | 7.3 ft | 9.0 ft | 11 ft | 9.6 ft | 10 ft | 10 ft |
| Period | 9.3 s | 8.4 s | 7.2 s | 6.9 s | 7.5 s | 8.0 s | 7.7 s | 8.3 s |
| Direction | SW | SSW | S | SSE | SE | SE | S | S |
| Swell | 7.3 ft · 8 s | 6.3 ft · 8 s | 4.8 ft · 8 s | 4.1 ft · 7 s | 4.5 ft · 8 s | 6.4 ft · 7 s | 4.1 ft · 8 s | 6.0 ft · 8 s |
| Wind (mph) | 12 S | 20 SE | 27 SE | 34 ESE | 37 ESE | 29 SW | 26 SSW | 26 S |
Previous days
The waves over the last 14 days. Tap a day to see it hour by hour.
| Day | Max wave | Period | Swell |
|---|---|---|---|
| Tue 27 | 13 ft SSW | 10 s | 10 ft SSW |
| Mon 26 | 18 ft SSW | 11 s | 10 ft S |
| Sun 25 | 14 ft SW | 10 s | 11 ft SW |
| Sat 24 | 12 ft SW | 11 s | 11 ft SW |
| Fri 23 | 19 ft SW | 12 s | 15 ft SW |
| Thu 22 | 19 ft SSW | 12 s | 10 ft SW |
| Wed 21 | 9.2 ft SSW | 8 s | 2.6 ft WSW |
Show all 14 days
These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.
Questions about the waves in Attu StationQuestions
How are the waves today in Attu Station?
Rough (10 ft with a period of 7.7 s from the south). The highest wave to expect is around 20 ft.
Which day will have the biggest waves this week?
Thursday 29, with waves up to 18 ft (very rough).
What is the wave period?
The time, in seconds, between two crests. With long periods (over 10 s) waves come from far away, are cleaner and break harder; with short periods they are wind waves, choppier.
What is significant wave height?
The average of the highest third of the waves. One in seven is higher and, a few times a day, one comes in at almost double: today, about 20 ft.
More about Attu Station today
Learn more
Waves: Open-Meteo with Météo-France (MFWAM, up to 10 days) and ECMWF WAM, CC BY 4.0; wave grid point 3.9 mi away. Near the shore, the seabed and the shape of the coast change the waves.
Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 5:40 pm (local time).
Spotted a mistake? Tell us · Where the weather and sea data come from