Even though the Lord blessed Lehi’s family so much, eventually many of them turned away from Him. After Nephi built a boat to travel the big sea, it wasn’t too far into their journey before part of the family rebelled against God once more. The Lord chastises us at times out of love, and this He did with them in the way of a great storm. It was only after the wicked part of the family repented that the Lord calmed the storm once more and took them all the way to their destination. See 1 Nephi 18 for more of the story.