Slate Island
Canada
Last wave reading:
Last reading
This reading is more than 3 hours old. The buoy may have stopped sending waves for now.
Significant wave height at the buoy
3.0 ft
0.9 m
- Dominant period
- 4 s
- Direction
- no direction
This station does not send a swell and wind-wave split, so the numbers are for the whole sea.
Short-period wind chop: 3.0 ft at 4 s.
Significant wave height is the average of the biggest third of waves at the buoy. It is not surf height at a beach.
Trend at the buoy
Height at the buoy
- Total (significant height)
Period
- Dominant period
Hourly means of the buoy's readings. Arrows point the way the waves travel.
Model vs the buoy
- Buoy, hourly
- Model, past days
- Model forecast
Over the last day, the model ran 17% high against the buoy.
| Day | Height | Peak period | From |
|---|---|---|---|
| Fri, Nov 13 | 3.5 ft | 4.4 s | NNE |
| Sat, Nov 14 | 2.0 ft | 3.6 s | NNE |
| Sun, Nov 15 | 2.8 ft | 4.2 s | SW |
| Mon, Nov 16 | 4.9 ft | 5.8 s | SW |
| Tue, Nov 17 | 4.8 ft | 6 s | SW |
| Wed, Nov 18 | 3.9 ft | 5.4 s | S |
| Thu, Nov 19 | 4.5 ft | 5.6 s | S |
ECMWF WAM wave model via Open-Meteo, nearest model cell (48.500°N, 87.000°W). Both lines are significant wave height at sea, the same measure the buoy reports. Model output, not a Quiver beach forecast.
Nearby buoys
- Mid Superior - 60 NM North Northeast Hancock, MI4.3 ftLive · 82 km
- East Superior Spotter6.2 ft · 6 sLive · 109 km
- East Superior -70 NM NE Marquette, MI5.2 ftLive · 110 km
- Grand Island North, MI0.7 ftStale · 177 km
- North Entry Buoy, North Keweenaw Peninsula, MI0.7 ftStale · 188 km
- South Entry Buoy, South Keweenaw Peninsula, MI0.3 ftStale · 205 km
Other readings
- Water temperature
- 45°F (7.0°C)
- Wind
- 17 kt from the N, gusts 23 kt
- Air temperature
- 34°F (1.3°C)
- Pressure
- 1020.8 hPa
Reported Nov 12, 5:00 PM EST.
How to read this buoy
Biggest hourly reading in that record: 3.6 ft at 4 s on Nov 11.
- Station id
- 45136
- Operator
- Environment and Climate Change Canada
- Program
- International Partners
- Position
- 48.540°N, 86.950°W
- Type
- Moored buoy
- Local time zone
- America/Toronto
- Swell split
- No, whole-sea numbers only
Source: NOAA National Data Buoy Center (NDBC); station operated by Environment and Climate Change Canada. Licence: Public domain (US government work). Station page at the source.
Not for navigation. Readings can be late, missing or wrong; check official marine forecasts before going to sea.
Buoy terms
- Significant height
- The average of the biggest third of waves the buoy measured. Sets in the surf zone can be bigger or smaller.
- Dominant period
- Seconds between the waves carrying the most energy. Longer period means more power and more bend around points.
- Swell vs wind waves
- Swell was made by distant wind; wind waves were made nearby. The buoy splits its spectrum at a cutoff period to report each.
- Direction
- Where waves come from, in degrees true. 270° is from the west.
