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Latest image at 40% opacity.
See sidebar for empirical estimates.
MODIS NDSI Snow Cover
High snow/ice (NDSI 80-100)
Moderate snow/ice (NDSI 40-80)
Low snow/ice (NDSI 1-40)
Snow-free land
Cloud (no data)
Transparent = open water
Shortwave IR separates cloud from ice.
Compare: white in true-color may be cloud
but transparent here = confirmed open water.
Compare: white in true-color may be cloud
but transparent here = confirmed open water.
Reading the Imagery
Cloud vs Ice: True-color shows both as white. Toggle NDSI Snow/Ice (top bar, or press N) to see algorithmic classification. Step +/- 1 day: clouds move, ice doesn't.
Open water
Ice OR cloud
Land/forest
Ice-Out Probability Empirical
Based on real ice-out records: Wawa Lake (1964-2023, wawa-news.com) adjusted by lake depth/size. Pure count: "X of N years were open by this date." No curve fitting.
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Historical Imagery MODIS 2001-2025
Same date, every year. Click to load.
Trout Lakes