How do I know if this is a good night to see the Northern Lights?
If you are in Lapland between early September and middle April, meaning that the nights are dark enough, there are two major factors to check: clouds and solar activity.
Cloud coverage. You would need to check the cloud coverage forecast to have an idea of the clouds’ situation in the area you are in. We recommend you the Finnish Meteorological Institute website and the Windy: Clouds (Play Store – App store) to monitor the clouds movement every hour.
Solar activity. Solar activity is more complicated to forecast long-term, but there are several platforms you can use as a reference or check the live/short-term activity. For the general simplified overview, you can use one of the many apps, such as “My Aurora Forecast & Alerts” (Play Store – App Store). They would often use so-called KP index to evaluate the chances, but keep in mind that KP index is not an ideal reference to estimate the probability of aurora showing up.
More reliable indicators of solar activity are in the live data, such as Bz and Bt. This data shows the live activity as well as very short-term forecast. It can be found on platforms like SpaceWeatherLive. To evaluate the activity simplified, negative Bz and positive Bt numbers are good indicators of strong auroral activity. Unfortunately, this data doesn’t provide a long-term forecast.
Note. With all the forecasts checked, you can get an idea of the weather conditions and solar activity estimates. Note, however, that there is no 100% way to predict auroras and the weather is subject to a change. And at the end of the day it is also a matter of luck, which makes it so special!
Can I see the Auroras in a cloudy night?
It’s not impossible, but it depends on the cloud cover. If there is solar activity and breaks in the clouds, you have a chance. With thin clouds and strong solar activity, you might see the Auroras through the clouds. However, with thick clouds and a fully covered sky, it is very unlikely you will see any lights.
What should I do to see the Northern Lights then?
Aurora Hunting!
Seeing Auroras might not be so easy. If you want to have better chances, then hunting is what you should do: drive away from the light pollution, find a good spot and… patiently wait. This how it works, and it is all part of the experience!