GOES-16 5-min visible imagery captured the flow of ice through and east of Quebec City on 3 February 2018 (Figure 1). The open river has the lowest reflectance (almost black) while the ice has moderate reflectance (gray) and snow (and clouds) has the greatest reflectance (lightest gray to white). The Day Cloud Phase Distinction RGB (Figure 2) better highlights the ice (deep green) versus other features such as snow (light green), water (dark), and water cloud (blue/aqua).
Figure 1: 3 February 2018 GOES-16 5-min 0.64 um visible imagery over Saint Lawrence River in Quebec, Canada. Full res
Figure 2: 1557 UTC 3 February 2018 GOES-16 Day Cloud Phase Distinction RGB. Full res
Bill Line, NWS
Satellite Liaison Blog 
