Observed arrival · 2026-09-22
Tonight Aurora, a five-factor Northern Lights forecast
A location-aware aurora forecast that combines geomagnetic activity, cloud cover, moonlight, darkness, and light pollution.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People deciding whether to look for auroras tonight
- Worth noticing
- The forecast weights Kp, clouds, moon, darkness, and Bortle-class light pollution separately.
Field notes
The forecast decomposes visibility into five weighted inputs rather than relying on geomagnetic activity alone: Kp carries 35% of the score, followed by clouds at 25%, with moon, darkness, and pollution making up the remainder. Its methodology distinguishes astronomical twilight from sunset and uses example location thresholds, including Kp 7 for London and Kp 3 for Tromsø. The page also warns that its 27-day outlook is for planning, not a guaranteed display.
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
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