After drenching eastern Cuba with heavy rain, Tropical Storm Oscar advanced toward the Bahamas on Monday.

Oscar produced maximum sustained winds of 40 mph (65 kph) and moved north-northeast at a speed of 9 mph (14 kph).

Early Tuesday, the storm was located approximately 70 miles (115 kilometers) south of Long Island, Bahamas, as reported by the U.S. National Hurricane Center in Miami.

The central and southeastern Bahamas were under a tropical storm warning.

Hurricane specialist and storm expert Michael Lowry recorded Oscar as the smallest hurricane, featuring a wind field of just about 6 miles (10 kilometers) across.

Lowry pointed out that no forecast model had predicted Oscar would escalate into a hurricane on Saturday before it struck the Bahamas.

He described this as a “colossal failure in hurricane forecasting” in an analysis he published on Monday.

On Sunday evening, Oscar, then a Category 1 hurricane with winds of 75 mph (120 kph), made landfall in the eastern Cuban province of Guantanamo near the city of Baracoa.

The storm caused flooding in low-lying areas and resulted in at least six fatalities.

Since last week, Cubans have faced significant power outages that have caused widespread loss of electricity and water across the island.

Oscar initially made landfall on Great Inagua in the Bahamas on Saturday, prompting evacuations after homes were damaged.

Meanwhile, off the southern Pacific coast of Mexico, Tropical Storm Kristy developed on Monday.

According to the National Hurricane Center, the storm was located 315 miles (510 kilometers) southwest of Acapulco and was moving west at 16 mph (26 kph) with sustained winds of 45 mph (75 kph).