Development in the past
In Norderney storm surge frequency increased over time. Such an increase may be caused by changes in storm activity, increasing mean sea levels and hydro-engineering measures. So far, the observed increase in Norderney is mainly caused by rising mean sea levels.
Data from the current season are preliminary and reflect the present status of the ongoing season.
Is the frequency in the current storm surge season unusual?
Blue curve below the orange one:
Within the current season, fewer storm surges are (so far) observed than usual.
Blue curve above the orange one but within the yellow area:
So far storm surges in the current season are more than normal (the long-term average), but not uncommon compared to the past.
Blue bar higher than the gray bar:
In the reference period (1961-1990) there was no season in which the number of storm surges within that month was higher than within the current season.