Tropical Storm Gabrielle was downgraded to a tropical depression Thursday morning, but still was expected to drop a fair amount of rain on Puerto Rico and the Dominican Republic, forecasters said.

Gabrielle is expected to dump up to 4 inches of rain in parts of Puerto Rico and up to 8 inches in other places, the National Hurricane Center in Miami said.

"These rains could cause dangerous flash floods and mudslides over mountainous terrain," the center said.