If you need a good overview of forecast weather for any area of the Great Lakes, going to the graphical marine forecasts area will bring you to this clickable map.
If you want information for Lake Michigan sailing conditions, you can see that it is divided up into five zones.
Clicking on the brown zone for the lower lake along the Michigan side will bring you to this next screen.
This lower lake map is also broken into clickable zones for your specific sailing grounds:
Clicking on any of them will bring up a detailed forecast for that particular zone.
This listing for Pentwater to Manistee shows the forecast and also notes a weather advisory (Gale Warning).
Going back to the clickable map, you'll note there are text hyperlinks above - including these:
The last two links on this page are covered here (link currently inop)
The Near Shore Marine forecast covers all zones for Lake Michigan wates within five nautical miles of shore.