Tropical Storm Richard dumped rain on Honduras on Sunday and was seen becoming a hurricane before hitting Belize and Mexico’s Yucatan peninsula later in the day.

Richard had top sustained winds near 70 miles per hour and was expected to barrel through southern Mexico and emerge in Mexico’s oil-rich Bay of Campeche on Tuesday as a tropical depression, the U.S. National Hurricane Center said.

At 5 a.m. EDT (0900 GMT), the storm was about 25 miles east of Isla Guanaja, Honduras, after brushing past the remote Miskito coast region where indigenous groups live in wooden houses along rivers vulnerable to flooding.

The hurricane center said the storm was a relatively small tropical cyclone, but becoming better organized.