Forecasting when the northern lights can be seen is in general very difficult. It is said more difficult than predicting the weather. What we do is interpreting forecast information given by reliable sources such as the Geophysical Institute in Alaska, The Icelandic Met Office and Space Weather Prediction Center of NOAA in USA. By combining long-term plans based on solar rotation from NOAA (on average, the sun revolves on its axis once every 27-28 days as seen from earth), with predictions based on more recent satellite photos of coronal mass ejection (happens 2-3 days before reaching earth) and the local cloud forecast in Iceland, we try to give you as good prediction as we possibility can.