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Severe weather warnings in Denmark

DMI issues warnings on severe weather conditions in Danish territories in accordance with guidelines agreed upon by the Danish Emergency Management Agency and the Danish National Police.

Warnings are broadcast up to 24 hours before severe weather is expected. However, many weather phenomena are often mentioned in DMI's general weather forecast to the public prior to issuing an actual warning.

A risk report is issued as warning of severe weather. Risk reports are often followed by a warning of severe weather when an overview of the areas affected and to what extent has been prepared.

Active warnings are displayed with a red flashing marker. 

Warning criteria 

Hurricane: Average wind speed exceeding 32 m/s over coastal areas of Fisher or the German Bight, or the Southern Baltic Sea, Western Baltic Sea, the Belts and the Sound, Kattegat or Skagerrak. 

Storm: Average wind speed exceeding 24 m/s over coastal areas of Fisher or the German Bight or the Baltic Sea around Bornholm, Western Baltic Sea, the Belts and the Sound, Kattegat or Skagerrak. 

Heavy rain: Precipitation exceeding 24 mm in 6 hours locally within the warning area.  

Storm surge: Precipitation exceeding 15 mm in 30 minutes locally within the warning area. 

Storm surge at the Danish West Coast:
Expected water levels exceeding 1.9 m at Thyborøn, Torsminde or Hvide Sande. Expected water levels exceeding 2.4 m at Vidå/Højer, Rømø or Esbjerg.

Storm surge in domestic waters and/or the Baltic Sea: Water levels at a Danish station are expected over 1.30 m by Skagerrak and Limfjorden, and/or 1.25 m in the Baltic Sea and domestic waters.

Heavy thunderstorm: Large number of lightning expected locally within the warning area.

Heavy snowfall: Precipitation exceeding 15 mm in 6 hours, equivalent to 15 cm of snow locally within the warning area.

Blizzard: Snowfall of more than 10 cm in 6 hours and average wind exceeding 10 m/s and possible drifting snow locally within the warning area.

Blowing and drifting snow: Light powdery snow and average wind speed exceeding 10 m/s causing possible blowing and drifting snow locally within the warning area.

Freezing precipitation: Extensive precipitation forming ice on the surface locally within the warning area.

Dense fog: Visibility of less than 100 m locally within the warning area.

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Translated by Marianne Brandt, kommunikation@dmi.dk