Heavy rainfall. Risk of flash flood, flooding of low-lying areas, flooding of basements, water on roads and viaducts (aquaplaning), and reduced visibility. Heavy thunderstorms involve a risk of fires, failure in electric systems, and many false alarms from automatic systems.
Category 1: Heavy rainfall, thunderstorms and flash flood. 15 to 25 mm rain in 30 min.
Valid for:
Lejre and Roskilde
Additional warnings issued for thunderstorm In København og Nordsjælland:
Awareness level yellow: Valid from 23.08.2026 06:15 GMT+01:00 to 23.08.2026 13:00 GMT+01:00
Category 1: Heavy rainfall, thunderstorms and flash flood. 15 to 25 mm rain in 30 min.
Valid for:
Allerød, Egedal, Frederikssund, Hørsholm and Nordsjælland.
Varoitus voimassa su klo 11:00 - su klo 17:00