glos.us Great Lakes Observing System: Observational data for the Great Lakes region
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Data Mapping:
 >> observations
explorer
>> get observations

Forecasts:
 >> hec now/forecasting
>> hec flows
>> weather conditions
>> weekly water levels

Offsite Data:
 >> surface water temps
>> more lake conditions

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Great Lakes Observations Viewer

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GLOS: Great Lakes Conditions Mapper provides Great Lakes Latest Observations, including air pressure, air temperature, cloud cover, dew point, waves, water temperature and winds via an interactive mapping interface. Additional features include WMS layers and base map selectability.

Disclaimer: All products published on this website are prototype products and are not intended to be used for navigational or operational purposes. Due to atmospheric or other conditions, latest data may not always be available. View full disclaimer.