Aurora Map Layers Guide: Aurora, Clouds, Daylight, Light Pollution
Understand each Aurora Forecast world map layer and how to combine overlays for better northern lights decisions.
The map in Aurora Forecast is designed as a decision tool: where activity is now, where sky is clear, and where darkness is sufficient for viewing. This guide explains exactly what each layer means.
Layer-by-Layer Meaning
| Layer | Primary Use | Important Note |
|---|---|---|
| Aurora activity | Shows where geomagnetic activity is currently elevated. | Not a full "ground visibility" verdict by itself. |
| Cloud overlay | Shows areas where clouds may block the sky. | Use together with aurora layer, not alone. |
| Daylight/twilight | Shows darkness viability windows across regions. | Aurora can be active but invisible in daylight. |
| Light pollution | Helps pick darker observing zones for visual contrast. | Useful for photography planning and weak displays. |
Critical Distinction: Activity vs Visibility
The aurora activity layer represents upper-atmosphere activity probability. It is intentionally different from the final "can I see it now?" status, which also depends on clouds, darkness, moon, and magnetic latitude.
Practical interpretation
If the aurora layer looks active but your location card is low visibility, check clouds and daylight first. In many cases, the activity is real but local viewing conditions are not yet favorable.
How to Read the Map in 30 Seconds
- Enable aurora + cloud + daylight layers.
- Find nearby active area with lower cloud coverage.
- Confirm darkness at your intended observation time.
- Use nearest-active suggestions if your point is blocked.
Best Workflow for Real Trips
- Use Aurora History to choose season and city.
- Use map layers on the same day for location choice.
- Use alerts for final timing when conditions align.
Recommended follow-up: Aurora History Explained and Aurora Alerts Setup.
Common Mistakes
- Checking only aurora activity and ignoring cloud overlay.
- Ignoring twilight and going out before full darkness.
- Assuming city-center viewing quality equals dark-sky edge locations.
- Not preparing a nearby backup point when local clouds are unstable.
Sources
- NOAA SWPC — OVATION Aurora Forecast — aurora oval data for map layers
- NOAA SWPC — Planetary K-index — geomagnetic activity data
