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NOAA/GLERL Great Lakes Depth-Averaged Currents Map
See Additional Currents: Latest Depth-Averaged | Latest Surface
Updated four times per day at 3 and 9 Eastern Time

1 cm/s

2 cm/s

5 cm/s

7.5 cm/s

10 cm/s

20 cm/s

Monthly Depth-Averaged
Currents for 2010-2013
jan Jan
feb Feb
mar Mar
apr Apr
may May
jun Jun
jul Jul
aug Aug
sep Sep
oct Oct
nov Nov
dec Dec
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Note, these maps are designed to depict a broad overview of the current field, and are considered to be more qualitative than quantitative. In particular, the specific coordinates are not very accurate. See also,, and

The flow patterns depicted in these visualizations of lake currents are based on simulations from the Great Lakes Coastal Forecasting System operated by NOAA's Great Lakes Environmental Research Laboratory.

The "Latest" and "3hrs Previous" visualizations depict water motion corresponding to a snapshot of lake currents at the present time and three hours previous to the present time. Lake currents can change rapidly with changing wind conditions.

Surface currents tend to follow the wind direction more closely than currents at depth. Depth-averaged currents represent the average water motion from surface to bottom and tend to follow shoreline and bottom contours.

This map uses copyrighted technology developed by Fernanda Viegas and Martin Wattenberg ( for their stunning wind map application. They have graciously allowed us to show visualization of lake currents here until license issues are resolved.

Data is acquired from from the GLOS THREDDS Data Server via OPeNDAP using python scripts (courtesy of Rich Signell).

Please send feedback and inquiries to: Eric Anderson.