Monster waves of 30 feet and more failed to materialize along the Leeward Coast of Oahu today but the bumpy, brown ocean was still rough enough for Danilo Cacalda to pull his boat out of the Waianae Small Boat Harbor.

Cacalda drove his 17-foot, Glasspar boat through brown, frothy waves of 6 to 10 feet that were still big enough to encourage him to give up a solo day of fishing and tow his boat back home to Waipahu.

"I got scared," Cacalda said this afternoon, "so I came back in."

Roman Tote and his buddies spent about four hours on the ocean in a 25-foot, Glasspar before giving up.

"It’s dirty out there," Tote said.

Sherwin Caraang, the boat’s owner, added, "and rough."

The west- and north-facing shores were expected to be hit by waves of 25 to 30 feet today because of a large west northwest swell that was forecast to make conditions unusually treacherous for harbors along leeward shores.

Instead, the waves were thick and brown — but not gigantic — along the Leeward Coast.

The National Weather Service, however, continued to forecast wave heights of 12 to 20 feet for west-facing shores early tomorrow morning, dropping to 8 to 15 feet by tomorrow afternoon.

North-facing shores are expected to see waves of nearly 25 feet tomorrow morning, falling to 15 to 20 feet tomorrow afternoon.

Another large northwest swell is forecast to arrive and bring high surf to west- and north-facing shores Wednesday night into early Friday, the weather service said.