Observed arrival · 2026-10-25
JordanWatch puts lake-bloom risk on a map
A free screening app for harmful algal blooms, with lake ratings, satellite data, local stations, and practical safety guidance.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Swimmers, paddlers, and dog owners
- Worth noticing
- Satellite readings are treated as early warnings, not toxin measurements; readings over a week old cannot produce a Low Risk rating.
Field notes
The method uses EPA CyAN satellite estimates of cyanobacteria, with roughly 300-meter pixels, and compares cell counts against 20,000 and 100,000 cells/mL thresholds. Rain, river levels, lake level, and wind can raise a location's rating; the page says the worst signal wins. It also warns that satellites do not measure toxins, and that readings older than a week can preserve a warning but cannot yield Low Risk.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
One card from the complete issue