Live Kp signal
NOAA SWPC K-index tells you whether geomagnetic conditions are waking up.
Aurora forecast with cloud cover
Kp is not enough. Know if the sky will actually show it.
Aurora apps tell you when the Sun is active. DarkestHour adds the missing field layer: cloud risk, moonlight, darkness and local visibility so you know whether the chase is worth the drive.
Cloud + moon filter
Aurora probability means little if the sky is blocked or a bright moon is washing out contrast.
Local chase decision
The paid layer should rank whether to wait, drive north/south, or save the fuel.
Confidence labels
Aurora forecasts are volatile. DarkestHour separates live data from estimated visibility.