The northern lights alerts are colour-coded:

• YelLow = Applicable to Northern Sweden (in some cases, very rare and sporadic, but passable, quick and short, just outside of their city limits of Stockholm, to the north), Northern Scotland, Iceland and Southern Scandinavia upwards.
• Orange = Applicable down to Northern Sweden (in some cases just outside of their city limits of Stockholm, to the north), Southern Scotland, Northern England, Northern Ireland, Denmark and Lithuania upwards.
• Red = Applicable to the whole Sweden, UK, Ireland, Netherlands, Germany and Poland upwards.
• Major, Severe, Extreme = Additional levels indicating exceptionally strong Northern lights. Do not miss these!