Marine forecast
Green Bay N of Cedar River–Rock I. Passage, MI
- current wind
- 7 kt NW
- Gusts
- 13 kt
- Seas
- 2.3 ft
- Period
- 4 sec
- Air
- 64°F
Observed Tue 2:40 PM | LMZ221
- Gusts now
- 13 kt
- Seas now
- 2.3 ft · 4 sec
- Air
- 64°F
- 72-hr peak
- 25 kt
- Peak seas
- 2 ft
In brief
At 2:40 pm EDT on Oct 13, 2026, NDBC station FPTM4 (Fairport, MI, 12 miles away) measured wind from the NW at 7 kt, gusting to 13 kt; buoy 45183 measured seas of 2.3 ft. The NWS forecast for Green Bay N of Cedar River–Rock I. Passage, MI issued at 11:01 am EDT on Oct 13, 2026 reads, for rest of today: “Northwest wind 10 to 15 knots. Mostly cloudy.”
Source: National Weather Service Marquette MI forecast; NDBC observations
Wind forecast · ktPeak 25 kt
Seas forecast · ftPeak 2 ft
NWS marine forecast
| Period | Forecast |
|---|---|
| Rest Of Today | Northwest wind 10 to 15 knots. Mostly cloudy. Waves 1 to 2 feet. |
| Tonight | Northwest wind less than 10 knots. Cloudy through midnight then becoming partly cloudy. Waves 1 to 2 feet. |
| Wednesday | North wind 5 to 15 knots. Mostly cloudy. Waves calm to 1 foot. |
| Wednesday Night | Northeast wind less than 10 knots. Mostly cloudy. Waves calm to 1 foot. |
Issued Tue 11:01 AM by Marquette MI (product NSHMQT).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 2:40 PM | 7 kt NW | 13 kt | — | — |
| Tue 1:50 PM | 12 kt WNW | 14 kt | — | — |
| Tue 12:50 PM | 9 kt WNW | 14 kt | — | — |
| Tue 11:50 AM | 10 kt NW | 12 kt | — | — |
| Tue 10:50 AM | 8 kt NNW | 12 kt | — | — |
| Tue 9:50 AM | 8 kt NNW | 13 kt | — | — |
| Tue 8:50 AM | 4 kt NNW | 5 kt | — | — |
| Tue 7:50 AM | 8 kt ENE | 11 kt | — | — |
| Tue 6:50 AM | 10 kt ENE | 18 kt | — | — |
| Tue 5:50 AM | 10 kt NE | 16 kt | — | — |
| Tue 4:50 AM | 9 kt ENE | 12 kt | — | — |
| Tue 3:50 AM | 9 kt E | 15 kt | — | — |
Observed Tue 2:40 PM at NDBC buoy FPTM4 (Fairport, MI), 11.7 miles away. Seas from buoy 45183 (Sleeping Bear Dunes), 70.9 miles away, at Tue 1:00 PM.
Frequently asked questions
What is the marine forecast for Green Bay N of Cedar River–Rock I. Passage today?
Rest Of Today: Northwest wind 10 to 15 knots. Mostly cloudy. Waves 1 to 2 feet.
Is there a small craft advisory for Green Bay N of Cedar River–Rock I. Passage?
No advisories, warnings or watches are in effect for NWS zone LMZ221 as of the last update on this page. Advisories can be issued at any time; check the current bulletin before leaving the dock.
How high are the waves at Green Bay N of Cedar River–Rock I. Passage right now?
Seas are running 2.3 ft at a 4-second period, measured at NDBC buoy FPTM4 Tue 2:40 PM, 11.7 miles from this zone. The forecast peaks at 2.0 ft Fri 2 PM.
What do the wind speeds in knots mean?
One knot is 1.15 mph. The National Weather Service issues a small craft advisory for sustained winds of roughly 22–33 knots or hazardous seas, a gale warning at 34–47 knots, and a storm warning at 48 knots and above. Exact advisory thresholds vary by forecast office and by water body — a bay reaches dangerous chop at a lower wind speed than open ocean.
Where does this forecast come from?
The forecast text is the National Weather Service's own marine bulletin for zone LMZ221, issued by Marquette MI, reproduced in full. The wind and seas charts are drawn from the NWS gridded forecast for a point inside the zone. Observations come from the nearest reporting NDBC buoy. We are not affiliated with NOAA or the National Weather Service.
Forecast: NOAA/NWS product NSHMQT, issued Tue 11:01 AM. Observations: NOAA National Data Buoy Center station FPTM4, read Tue 2:40 PM. Retrieved Oct 13, 3:42 PM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.