CORPUS CHRISTI, Texas (AP) — The Coast Guard has sent two helicopters to try to rescue the crews of three tugboats in distress near the Lydia Ann Channel near Port Aransas, Texas.

The Coast Guard at Corpus Christi says it received a mayday notification Saturday from crew members aboard the Belle Chase, Sandy Point and Sabine Pass.

Two MH-65 Dolphin helicopter aircrews have been sent to rescue the crews.

Texas is being pounded by Hurricane Harvey, which came ashore as a Category 4 hurricane Friday night but has since been downgraded to a Category 1 as it moves inland. Forecasters warn that it could cause catastrophic flooding in the coming days.