Warnings on the sea water level

On the basis of the sea water level observations made, the warning limits have been set so that the frequency of warnings at the lowest risk level (yellow) is once a year, at the second risk level (orange) once in five years, and at the highest risk level (red) once in 20 years.

Only one warning level is used for low water (yellow), but all three warning levels are used for high water (yellow, orange and red). The warning levels are set for the 14 observation stations.

Warnings for sea level are drawn up for periods of up to 5 days.

Sea level warning limits

The warning limits are listed in the tables below referenced to the theoretical mean water (MW) and N2000 (BSCD2000) systems.

Theoretical mean water (MW)

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  low
(yellow)
high
(yellow)
very high
(orange)
dangerously high (red)
Kemi, Oulu -80 cm 115 cm 140 cm 170 cm
Raahe, Pietarsaari -65 cm 85 cm 110 cm 130 cm
Vaasa -50 cm 85 cm 110 cm 130 cm
Kaskinen, Pori, Rauma -50 cm 75 cm 100 cm 120 cm
Föglö -50 cm 65 cm 85 cm 100 cm
Turku, Hanko -50 cm 70 cm 95 cm 110 cm
Helsinki, Porvoo -60 cm 80 cm 115 cm 130 cm
Hamina -70 cm 110 cm 145 cm 170 cm

N2000 (BSCD2000)

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  low
(yellow)
high
(yellow)
very high
(orange)
dangerously high (red)
Kemi, Oulu -72 cm 123 cm 148 cm 178 cm
Raahe -57 cm  93 cm 118 cm 138 cm
Pietarsaari -59 cm  91 cm 116 cm 136 cm
Vaasa -44 cm  92 cm 117 cm 137 cm
Kaskinen -41 cm  84 cm 109 cm 129 cm
Pori, Rauma -39 cm  86 cm 111 cm 131 cm
Turku -36 cm  85 cm 110 cm 125 cm
Föglö -39 cm  76 cm  96 cm 111 cm
Hanko -32 cm  88 cm 113 cm 128 cm
Helsinki, Porvoo -39 cm 101 cm 136 cm 151 cm
Hamina -49 cm 131 cm 166 cm 191 cm

The warning limits in N2000 height system change some millimeters every year.

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