Delavan Lake siteid=355 · WI
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Greenness overlay (ExG excess-green proxy) computed per satellite scene, drawn over the natural-color image. Yellow → orange → red with rising score; clear water transparent. RGB proxy — MCI/phycocyanin signals remain the bloom authority for advisories.
mild
strong
intense
Year:
—
KEY
bottom row = one dot per satellite image (click to view; dashed = flagged)
vertical line = selected image
14-day greenness trend
typical range for this time of year (this lake's own history)
background zones = severity (clear / mild / strong / intense)
water temp (°F, right-end label)
orange °= period's high air temp
selected scene
Dots = per-scene surface greenness (optical proxy), colored by imagery source. The olive line is the 14-day trend — when it rides above the shaded "typical for this date" band, the lake is greener than its own normal. Click a dot or drag the slider to view a scene below.