Great Lakes Marine Forecasts
The nearshore and open waters of Lakes Superior, Michigan, Huron, Erie and Ontario, Lake St. Clair and the St. Lawrence River. The National Weather Service forecast for every zone, with the warnings and advisories in force.
Great Lakes marine zones on the map
The 134 zones, tinted by the most serious marine warning or advisory in force. Tap a zone to open its forecast.
- Small Craft Advisory
Alerts in force
Small Craft Advisory 2 zones
NWS Detroit/Pontiac, MI
15 zones, in the Open Lakes Forecast and Nearshore Marine Forecast.
- St. Clair River
- Detroit River
- Lake St. Clair Open Lake (U.S. Portion)
- Michigan Waters of Lake Erie from Detroit River to North Cape MI
- Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt to the US/Canadian border beyond 5 NM from shore
- Lake Huron from Presque Isle Lt. to Sturgeon Point MI 5NM off shore to US/Canadian border
- Lake Huron from Sturgeon Point to Alabaster MI 5NM off shore to US/Canadian border
- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay
- Inner Saginaw Bay SW of Point Au Gres to Bay Port MI
- Port Austin to Harbor Beach MI
- Harbor Beach to Port Sanilac MI
- Port Sanilac to Port Huron MI
- Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the US/Canadian border
- Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to US/Canadian border
- Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border
NWS Buffalo, NY
14 zones, in the Nearshore Marine Forecast and Open Lakes Forecast.
- Upper Niagara River and Buffalo Harbor
- Ripley to Dunkirk NY
- Dunkirk to Buffalo NY
- Lower Niagara River
- Niagara River to Hamlin Beach NY
- Hamlin Beach to Sodus Bay NY
- Sodus Bay to Mexico Bay NY
- Mexico Bay NY to the St. Lawrence River
- Niagara River to Hamlin Beach NY beyond 5NM off shoreline to US-Canadian border
- Hamlin Beach to Sodus Bay NY beyond 5NM off shoreline to US-Canadian border
- Sodus Bay to Mexico Bay NY beyond 5NM off shoreline to US-Canadian border
- Mexico Bay NY to the St. Lawrence River beyond 5NM off shoreline to US-Canadian border
- St. Lawrence River above Ogdensburg NY
- St. Lawrence River from Ogdensburg to St. Regis NY
NWS Cleveland, OH
17 zones, in the Open Lakes Forecast and Nearshore Marine Forecast.
- Ripley to Buffalo NY extending from 5NM off shoreline to US-Canadian border
- Maumee Bay to Reno Beach OH
- Reno Beach to The Islands OH
- The Islands to Vermilion OH
- Vermilion to Avon Point OH
- Avon Point to Willowick OH
- Willowick to Geneva-on-the Lake OH
- Geneva-on-the-Lake to Conneaut OH
- Conneaut OH to Ripley NY
- Detroit River Lt. to Maumee Bay OH to Reno Beach OH beyond 5NM offshoreline to US-Canadian border
- Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border
- The Islands to Vermilion OH beyond 5 nm off shoreline to US-Canadian border
- Vermilion to Avon Point OH beyond 5 nm off shoreline to US-Canadian border
- Avon Point to Willowick OH beyond 5 nm off shoreline to US-Canadian border
- Willowick to Geneva-on-the-Lake OH beyond 5NM off shoreline to US-Canadian border
- Geneva-on-the-Lake to Conneaut OH beyond 5 nm off shoreline to US-Canadian border
- Conneaut OH to Ripley NY beyond 5 nm off shoreline to US-Canadian border
NWS Gaylord, MI
13 zones, in the Nearshore Marine Forecast.
- Straits of Mackinac within 5 nm of Mackinac Bridge including Mackinac Island
- St Ignace to False Detour Channel
- 5NM East of Mackinac Bridge to Presque Isle Light MI including Bois Blanc Island
- Presque Isle Light to Sturgeon Pt MI Including Thunder Bay National Marine Sanctuary
- Sturgeon Pt to Alabaster MI
- Grand Traverse Bay south of a line Grand Traverse Light to Norwood MI
- Seul Choix Point to 5NM West of Mackinac Bridge
- Norwood MI to 5NM West of Mackinac Bridge including Little Traverse Bay
- Sleeping Bear Point to Grand Traverse Light MI
- Point Betsie to Sleeping Bear Point MI
- Manistee to Point Betsie MI
- Whitefish Bay (U.S. Portion)/Whitefish Point to Point Iroquois MI
- St. Marys River Point Iroquois to E. Potagannissing Bay
NWS Northern Indiana
2 zones, in the Nearshore Marine Forecast.
NWS Milwaukee/Sullivan, WI
24 zones, in the Open Lakes Forecast and Nearshore Marine Forecast.
- Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.
- Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake
- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and North of a line from Charlevoix MI to South Fox Island 5NM offshore
- Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to mid lake
- Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake
- Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake
- Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake
- Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake
- Sheboygan to Port Washington WI
- Port Washington to North Point Light WI
- North Point Light to Wind Point WI
- Wind Point WI to Winthrop Harbor IL
- Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake
- Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake
- Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake
- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake
- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
- Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake
- Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake
- Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake
- Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake
- Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake
- Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake
- Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake
NWS Marquette, MI
21 zones, in the Nearshore Marine Forecast and Open Lakes Forecast.
- Green Bay North of line from Cedar River MI to Rock Island Passage
- Seul Choix Point to Point Detour MI
- 5NM East of a line from Fairport MI to Rock Island Passage
- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
- Saxon Harbor WI to Black River MI
- Black River To Ontonagon MI
- Ontonagon to Upper Entrance of Portage Canal MI
- Upper Entrance of Portage Canal to Eagle River MI
- Eagle River to Manitou Island MI
- Manitou Island to Point Isabelle MI
- Point Isabelle to Lower Entrance of Portage Canal MI
- Portage Lake to Huron Island MI to Lower Entrance of Portage Canal To Huron Islands MI Including Keweenaw and Huron Bays
- Huron Islands to Marquette MI
- Marquette to Munising MI
- Munising to Grand Marais MI
- Grand Marais to Whitefish Point MI
- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park
- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore
- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
NWS Green Bay, WI
5 zones, in the Nearshore Marine Forecast.
NWS Chicago
6 zones, in the Nearshore Marine Forecast.
NWS Grand Rapids, MI
6 zones, in the Nearshore Marine Forecast.
NWS Duluth, MN
11 zones, in the Nearshore Marine Forecast.
- Chequamegon Bay-Bayfield to Oak Point WI
- Grand Portage to Grand Marais MN
- Grand Marais to Taconite Harbor MN
- Taconite Harbor to Silver Bay Harbor MN
- Silver Bay Harbor to Two Harbors MN
- Two Harbors to Duluth MN
- Duluth MN to Port Wing WI
- Port Wing to Sand Island WI
- Sand Island to Bayfield WI
- Oak Point to Saxon Harbor WI
- Outer Apostle Islands Beyond 5 NM from Mainland
By coast
- Atlantic Coast153 zones · 117 under alerts
- Gulf of America106 zones
- Caribbean and Southwest Atlantic49 zones
- Puerto Rico and the U.S. Virgin Islands10 zones
- Great Lakes134 zones · 2 under alerts
- Pacific Coast68 zones · 37 under alerts
- Alaska124 zones · 82 under alerts
- Hawaii16 zones · 15 under alerts
- Guam and Micronesia11 zones
- American Samoa7 zones
- Mexico and Central America Pacific21 zones
- High seas5 areas
Sources
Forecasts from the National Weather Service marine program. Zone outlines from the NWS marine and offshore zone boundaries. Warnings and advisories from the NWS API, read 09:19 UTC. All public domain, from the National Weather Service.