How to assess rough water severity?

How to assess rough water severity? - Foamy waves crashing on rocky cliff

I'm considering taking the ferry from Dalvík to Grímsey, which is a 4 hours ride. I've had a very bad experience with a ferry in very rough waters and I don't like to repeat it anytime soon. There was kind of bad weather in the north of Iceland in the past few days but I have no idea how to figure out if the waters between Dalvík and Grímsey are rough.

How can I check the water condition?






Pictures about "How to assess rough water severity?"

How to assess rough water severity? - Picturesque landscape of blue water surface of pond surrounded by rocky mountainous terrain under cloudy sky
How to assess rough water severity? - Severe rough rock formation located in shallow sea washed by foamy waves under gloomy sky
How to assess rough water severity? - Breathtaking distant scenery of rocky relief covered with mosses and lichens with river and waterfall flowing into narrow ravine under gray cloudy sky





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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Julia Volk, Rachel Claire, Julia Volk, ArtHouse Studio