It's a different poem in my textbook:
Ripples with the appearance of scales, no foam crests
Small wavelets; crests of glassy appearance, no breaking
Large wavelets; crests begin to break, scattered whitecaps
Small waves, becoming longer; numerous whitecaps
Moderate waves, taking longer to form, many whitecaps, some spray
Large waves begin to form, whitecaps everywhere, more spray
Sea heaps up and white foam from breaking waves begins to be blown in streaks
Moderately high waves of greater length, edges of crests begin to break into spindrift, foam is blown in well-marked streaks
High waves, dense streaks of foam and sea begins to roll, spray may affect visibility
Very high waves with overhanging crests; foam is blown in dense white streaks, causing the sea to appear white; the rolling of the sea becomes heavy; visibility reduced
Exceptionally high waves (small and medium-sized ships might fora time be lost from view behind the waves), the sea is covered with white patches of foam, everywhere the edges of the wave crests are blown into froth, visibility further reduced
The air is filled with foam and spray, sea completely white with driving spray, visibility greatly reduced.