Clear North: Aurora Alerts — ASO

By Matthew Donders on AppTrack Ninja.

Only when you can see it

Most aurora alerts tell you the sun is busy. Clear North tells you whether you can actually see the lights tonight. An alert only fires when all three are true at your location: • Activity is high enough for your latitude • It is dark (the sun is well below the horizon) • The sky is clear enough (low cloud cover) If one fails, Clear North says which one: "Not enough activity: Kp 5, you need 6", or "Too cloudy: 94% cover". TONIGHT (free) A clear verdict (Likely, Possible or Unlikely), the best window to look, how high above the horizon to look, and an hour-by-hour table of activity, cloud and …

Categories: Weather, Travel

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