National Weather Service United States Department of Commerce


Marine Weather Data and Forecasts


Northeast Wisconsin and Lakeshore Hourly Weather Roundup
Wisconsin Hourly Weather Roundup
Lake Michigan Coast Guard
Western Great Lakes Buoy and C-Man Data
Western Great Lakes Buoy, C-Man, and Ship Obs 
Other Buoy and C-Man Sites
National Ocean Service Observations 
Western Great Lakes Ice Analysis -- National Ice Center
Lake Michigan Surface Temperature Analysis
Great Lakes Surface Temperature Analysis
Great Lakes Water Levels: Source 1    Source 2
Eastern Wisconsin and Lk Michigan Surface Plot -- Updated hourly
Lake Winnebago Info -- USACE - Water flows and levels
Satellite-Derived Winds


Northwest Lk Michigan Nearshore -- Including Green Bay
North Lk Michigan Nearshore -- Including far northern Green Bay
Southwest Lk Michigan Nearshore -- Including Milwaukee shore
Lk Michigan Open Waters -- Beyond 5 nm from shore

Graphical Forecast -- Great Lakes
Model Forecast -- Great Lakes Coastal Forecasting System


Long-Duration Watch / Warning / Advisories
Marine Weather Message -- NW Lk Mich including Green Bay

Short-Fused Warnings

Weather Statements -- NW Lk Mich including Green Bay
Special Marine Warnings -- NW Lk Mich including Green Bay

For Mobile Devices
Weather Observations


Information for the Marine Community

Rip Current Safety
Rip Current Safety Video
National NWS Marine Services Program
National NWS Marine Forecasts
Mariners Weather Log Magazine
NOAA BookletCharts for the Great Lakes

About the Program

The National Weather Service in Green Bay issues forecasts and warnings for a part of northwest Lake Michigan, including the Bay of Green Bay.

The Nearshore Marine Forecast is for waters within 5 nautical miles from shore, and contains a forecast of wave heights, wind and weather out to 48 hours. The Nearshore Marine Forecast is issued year round for much of the lake.

A Special Marine Warning is issued when hazardous weather conditions of short duration, such as those associated with thunderstorms, are expected to produce winds of 34 knots or more.

Lakeshore and Coast Guard Observations are collected and broadcast hourly on the Green Bay and Sister Bay NOAA Weather Radio stations.