Boat Seats Seconds
How can I make this better?
"Hold up all right!" Sean screamed in fright when he grabbed the edges of the Boat, while the current moved the boat for the storm. The waves reached more than six meters and crashed into the corner after another. The boat lifted into the air and slammed back down against the water. Max grabbed the hand, and yet almost fell out as the boat again beaten into the water. Torrential rain began to lash their terrified faces, and caused the water to reach his ankles. Then a string of brilliant lightning struck the sky and illuminated the clouds. There was silence except for the unique sound of raindrops splashing in the ocean. Then, BOOM! Abrupt thunder echoed throughout. Within seconds another bolt flash, then another max. and his friends slipped under the rear seat as the rain became too heavy. Then another wave lifted the boat, causing it to roll uncontrollably to the other side. They could not stop himself from crying.
What size boat? How many people are in it? What kind of boat? It's the engine off? You have not set the scene very well for us, but if this is a continuation of a great scene, I'll assume you already did it. And six feet waves can seem daunting if you've never met him, but the really big storms produce waves very higher than that. This seems to be a storm that would produce waves in fifteen to twenty foot range. You can use "so" twice in one paragraph. I have a personal peeve against sentences that begin with "there" (your mileage may vary), then I would say something like "strange silence reigned, and the sound of rain pattering on. Ocean "Losing the Boom, you do not need it." Another flash screwed – I would say "Another bolt winked down, "but again, that's probably a YMMV thing." As the rain became too heavy – too heavy for what they are? I am unable a sense of their characters from, probably so. I understand that they are terrified, but I want more. His senses overwhelmed by the storm, give us a sense that. The water in your nose, the rain plastering his hair down and running into their eyes and ears, crackling electricity in the skin, being deaf by the thunder … It's a start good, very suggestive ey action. 
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