Will I see the aurora tonight from Tromso?

There is currently a 33% chance of seeing the aurora from Tromso.

What is the Kp index and how does it affect aurora visibility from Tromso?

The Kp index measures geomagnetic activity on a 0-9 scale. Higher values push the auroral oval further toward the equator. Tromso, Norway's aurora chances grow as Kp rises above 5 (G1 minor storm).

Possible

Tromso· Norway

69.65°N, 18.96°E · Northern Hemisphere · Updated 4 minutes ago

Chance of aurora right now

33%

Possible

Look toward the northern horizon. Cloud cover is 60% right now.

Key metrics

Geomagnetic Kp: 2; Quiet
Auroral boundary: 61.5°; Equator-most latitude where aurora is visible
Cloud cover: 60%; Mostly cloudy
Best window: Fri, May 1 · 00:00 UTC; 100% at in 2 days
Direction to look: North; Toward the northern horizon
Hemisphere: Northern; Aurora Borealis

What this means

There is a real chance of aurora tonight. If you go outside, find a dark spot away from city lights and look north.

Heavy cloud cover (60%) will reduce visibility even if aurora is active overhead.

The strongest window in the next 72 hours looks to be around Fri, May 1 · 00:00 UTC, at about 100% cloud-adjusted visibility.

72-hour forecast

Tue, Apr 28
21:00 UTC
29%
60%
Wed, Apr 29
00:00 UTC
49%
40%
Wed, Apr 29
03:00 UTC
10%

How we forecast

We combine three inputs to produce a single cloud-adjusted visibility probability:

Kp index
NOAA SWPC's 3-hour geomagnetic activity forecast — how strong the aurora-driving storms are.
Auroral oval
The boundary 66.5° − 2.5 · Kp — the lowest latitude where aurora is normally visible.
Local clouds
Open-Meteo's hourly cloud cover for your location. Heavy clouds reduce visibility proportionally.

Other aurora cities

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