Wind Speed 11

 Ivry Ben Efraim
Wind Speed 11

Violent storm.

Wind speed is 56–63 knots.

Exceptionally high waves; small- and medium-sized ships might be for a long time lost to view behind the waves; sea is covered with long white patches of foam; everywhere the edges of the wave crests are blown into foam; visibility affected.

On land, very rarely experienced; accompanied by widespread damage