John Gill Commentary Mark 4:37

"And there ariseth a great storm of wind, and the waves beat into the boat, insomuch that the boat was now filling." — Mark 4:37 (ASV)

And there arose a great storm of wind
Called Laelaps, a wind that is suddenly whirled about upwards and downwards, and is said to be a storm, or tempest of wind with rain; it was a sort of a hurricane:

and the waves beat into the ship, so that it was full ;
of water, and ready to sink. Beza says in one copy it read, (buyizesyai) , and so in one of Stephens's. It was immersed, covered all over with water, and was going down at once to the bottom; so that they were in imminent danger, in the utmost extremity; (See Gill on Matthew 8:24).