From Marstrand to Strömstad, low-lying piers and buildings are at risk of flooding and the sail-free height under bridges may decrease.
Moored ships may also be damaged on Thursday, especially between 11 a.m. and 2 p.m.
However, the risk of flooding is very small, according to Jörgen Öberg, oceanographer on duty at SMHI.
Water levels at this level, even higher, happen several times a year. In Uddevalla it is about to turn downward now, he says at around 10 o'clock.
From Halmstad and south along the Halland coast, sensitive stretches of coast are also at risk of erosion. The water level there is expected to be highest between 10 am and 5 pm.
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