This is great! I had been using "MODIS Today" to track the changes in water/ice levels on regional lakes and rivers but this is much higher resolution.
Also consider giving Sentinel-1 a look, if you haven't already. C-band synthetic aperture radar, about 20 m ground resolution in its land imaging mode. Radar imagery works really well for water detection, and since it penetrates clouds it works all-weather day-or-night.
Nominal revisit is about every 2 days at the mid latitudes, although one of the two spacecraft failed so it's currently about every 4 days until ESA can launch a replacement.
The Alaska Satellite Facility (a NASA center) provides a graphical search tool and APIs for accessing Sentinel-1 data, as well as a bunch of tutorials.
