SAN JUAN, Puerto Rico (AP) — Tropical Storm Bertha swirled over the eastern Dominican Republic early Sunday morning after whipping Puerto Rico with heavy rains and strong winds that knocked out power in parts of the region.

The storm’s maximum sustained winds dropped slightly to 45 mph (75 kph), but slow strengthening was expected by Monday. Bertha was centered about 30 miles (45 kilometers) east-northeast of Santo Domingo, Dominican Republic and was moving northwest at 21 mph (33 kph) Sunday morning.