Ice motion on the Great Lakes1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) revealed the fracturing of land-fast ice in the far southern portion of Lake Michigan on 19 February 2021. Although the westerly wind speeds were not particularly strong — generally 15-20 knots over water, including Metop ASCAT winds early in the day — these winds in tandem with lake currents were enough to move some of this ice eastward.
Farther to the north over western Lake Superior, 5-minute CONUS sector GOES-16 Visible images (below) also showed a significant amount of ice motion during the day.A 30-meter resolution Landsat-8 False Color RGB image viewed using RealEarth (below) provided a more detailed look at the ice structure over western Lake Superior at 1653 UTC. Ice and areas of vegetation-sparse snow cover (rivers, lakes and wildfire burn scars) appear as shades of cyan in the RGB image.
===== 20 February Update =====On 20 February, another look at 1-minute GOES-16 Visible images over southern Lake Michigan (above) indicated that new ice leads were opening up within individual ice floes that had broken free a day earlier.
===== 21 February Update =====On 21 February, GOES-16 Visible images (above) showed how southerly winds were shifting much the ice in Lake Erie to the north. However, the effects of lake currents on the ice motion were also evident. As mentioned in this blog post, ice coverage on Lake Erie was around 80%.