PLAN YOUR NIGHT
Check tonight’s conditions, then plan ahead with the seven-night calendar.
The sky is too bright for a clear view of the northern lights. Check tonight’s dark window and watch for breaks in the clouds.
Estimated geomagnetic index
NOAA · 13 Sept, 12:00 UTC · StaleSpeed measured upstream of Earth
NOAA / SOLAR1 · 13 Sept, 16:25 UTCSouthward values can support activity
NOAA / SOLAR1 · 13 Sept, 16:26 UTCPLAN THE NIGHTS AHEAD
Choose a night to explore. Activity has a shorter forecast horizon than weather. All times are local to Tromsø.
Cloud ranges use available forecast samples during dark hours. Later nights have fewer samples and greater uncertainty.
THE REST OF THIS NIGHT
NOAA’s forecast covers this night’s dark window. Kp describes global geomagnetic activity; it is not your chance of seeing the northern lights.
Each column is an actual forecast time; later forecasts may be six hours apart. Darkness means the sun is at least 12° below the horizon. Northern lights can appear at high latitudes even when Kp is low.
NOAA three-day outlook · issued 13 Sept, 12:30 UTC
MET Norway · issued 13 Sept, 15:33 UTC
An Arctic island city surrounded by fjords and mountains. Compare cloud forecasts before choosing a direction for the evening.
