The U.S. National Hurricane Center said Pilar had winds of 40 mph (65 kph) and was located about 70 miles (110 kilometers) west-southwest of the port city of Manzanillo. It was moving north at about 5 mph (7 kph).
The hurricane center said late Saturday that Pilar was expected to move over or very near the coast of Jalisco on Sunday as a tropical storm.
The center warned of heavy rains over southwest Mexico through Monday.
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