What are tides 

The tides along the west coast of Jutland
The tides in the Danish waters are an offshoot of the tides from the Atlantic Ocean. The tidal wave flows into the North Sea via the English Channel (a northbound wave) and through the waters north of Scotland (the dominant part), from where the wave turns south, flows into the North Sea and follows the coasts of England.

The wave swings around the North Sea’s southern part and heads north along the Danish west coast. This means that a high tide at the Danish coast first occurs by the German border. The high tide moves up along the west coast and reaches Skagen about three hours later than it does at Rømø, while tide size decreases. The average difference between high and low tide is approximately 125 cm at Rømø, and approximately 25 cm at Skagen. The tide at Skagen is only about one fifth of the tide at Rømø.

Tides in the inner Danish waters
The tidal wave enters the inner Danish waters from the North Sea, continues into Skagerrak and from there flows south to the Baltic Sea. The high tide takes eight hours to move from Skagen to Korsør. The average difference between high and low tide is from 10 to 30 cm in the inner Danish waters.

The tides are half daily, which means that high tides at a given place, occur with an interval of 12 ½ hours.