Marine forecast
Pentwater to Manistee, MI
- current wind
- 14 kt WNW
- Gusts
- 15 kt
- Seas
- 2.6 ft
- Period
- 5 sec
- Air
- 62°F
Observed Tue 2:40 PM | LMZ849
- Gusts now
- 15 kt
- Seas now
- 2.6 ft · 5 sec
- Air
- 62°F
- 72-hr peak
- 36 kt
- Peak seas
- 10 ft
In brief
At 2:40 pm EDT on Oct 13, 2026, NDBC station BSBM4 (Big Sable Point, MI, 2 miles away) measured wind from the WNW at 14 kt, gusting to 15 kt; buoy 45210 measured seas of 2.6 ft. The NWS forecast for Pentwater to Manistee, MI issued at 2:11 pm EDT on Oct 13, 2026 reads, for through early evening: “Northwest winds 10 to 20 knots. Partly sunny.”
Source: National Weather Service Grand Rapids MI forecast; NDBC observations
Wind forecast · ktPeak 36 kt
Seas forecast · ftPeak 10 ft
NWS marine forecast
| Period | Forecast |
|---|---|
| Through Early Evening | Northwest winds 10 to 20 knots. Partly sunny. Waves 3 to 5 feet. |
| Tonight | North winds 5 to 10 knots. Partly cloudy. Waves 2 to 4 feet. |
| Wednesday | North winds 10 to 20 knots. Mostly cloudy. Waves 2 to 4 feet. |
| Wednesday Night | Northeast winds 10 to 20 knots becoming after midnight. Partly cloudy. Waves 2 to 4 feet. |
| Thursday | East winds 5 to 15 knots. Mostly cloudy. Waves around 1 foot. |
| Thursday Night | Northeast winds 5 to 10 knots backing northwest 10 to 20 knots in the late evening and early morning, then increasing to gales to 35 knots after midnight. Cloudy with a chance of rain showers. Waves 1 to 2 feet building to 5 to 7 feet after midnight. |
| Friday | Northwest gales to 45 knots. Partly sunny with a chance of rain showers. Waves 11 to 15 feet. |
| Saturday | Northwest winds 10 to 20 knots backing southwest early in the afternoon. Sunny. Waves 5 to 7 feet subsiding to 3 to 5 feet in the late morning and afternoon. |
| Sunday | Southwest gales to 35 knots. Sunny. Waves 7 to 11 feet. |
Issued Tue 2:11 PM by Grand Rapids MI (product NSHGRR).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 2:40 PM | 14 kt WNW | 15 kt | — | — |
| Tue 1:50 PM | 13 kt W | 16 kt | — | — |
| Tue 12:50 PM | 17 kt W | 21 kt | — | — |
| Tue 11:50 AM | 18 kt W | 19 kt | — | — |
| Tue 10:50 AM | 13 kt W | 17 kt | — | — |
| Tue 9:50 AM | 12 kt W | 15 kt | — | — |
| Tue 8:50 AM | 20 kt W | 25 kt | — | — |
| Tue 7:50 AM | 7 kt S | 11 kt | — | — |
| Tue 6:50 AM | 12 kt SSE | 16 kt | — | — |
| Tue 5:50 AM | 11 kt S | 15 kt | — | — |
| Tue 4:50 AM | 13 kt S | 17 kt | — | — |
| Tue 3:50 AM | 11 kt S | 15 kt | — | — |
Observed Tue 2:40 PM at NDBC buoy BSBM4 (Big Sable Point, MI), 1.7 miles away. Seas from buoy 45210 (Rawley Point East, WI (269)), 26.8 miles away, at Tue 2:56 PM.
Frequently asked questions
What is the marine forecast for Pentwater to Manistee today?
Through Early Evening: Northwest winds 10 to 20 knots. Partly sunny. Waves 3 to 5 feet.
Is there a small craft advisory for Pentwater to Manistee?
No advisories, warnings or watches are in effect for NWS zone LMZ849 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 Pentwater to Manistee right now?
Seas are running 2.6 ft at a 5-second period, measured at NDBC buoy BSBM4 Tue 2:40 PM, 1.7 miles from this zone. The forecast peaks at 10.0 ft Fri 11 AM.
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 LMZ849, issued by Grand Rapids 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 NSHGRR, issued Tue 2:11 PM. Observations: NOAA National Data Buoy Center station BSBM4, 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.