Marine Heatwave Map Screensaver
The Marine Heatwave Map screensaver reads live sea-surface temperature at a set of ocean points worldwide and colour-flags each against its seasonal norm, so unusually warm water stands out at a glance — key-less, live from the Open-Meteo Marine API. It's free, runs in your browser, and ESC exits.
How the Marine Heatwave Map screensaver works
The saver fetches live sea-surface temperature for a fixed set of ocean points from the key-less Open-Meteo Marine API.
Each point is compared against a typical seasonal baseline for that location and month.
Points warmer than normal glow orange to red; near-normal points stay a calm blue.
The map refreshes on a schedule so the picture tracks real conditions as they change.
A worked example
During a Pacific marine heatwave you might see the points off California and Hawaii glow deep orange — several degrees above normal — while the North Atlantic stays a cool blue.
Settings & tips
- Show temperatures toggles the numeric readout at each point.
- Accent recolours the warm-anomaly glow.
- Baselines are approximate seasonal climatology, not a single official product.
Frequently asked questions
- Is this an official NOAA marine-heatwave product?
- No — it's a live approximation using real sea-surface temperature against seasonal norms, not the official NOAA Coral Reef Watch alert system.
- Is a key needed?
- No. Open-Meteo Marine is free and key-less.
- How often does it refresh?
- On a set interval, matching the pace ocean temperature actually changes.
- Is it free?
- Yes — free, no download, in your browser.