The National Hurricane Center says a subtropical depression has formed over the western Atlantic north of Puerto Rico.
The depression has maximum sustained winds Wednesday near 35 mph (55 kph). Slow strengthening is expected and it could become a tropical storm later in the day.
The depression is located about 270 miles (435 kilometers) north-northwest of San Juan, Puerto Rico, and is moving northwest near 8 mph (13 kph).
Addition heavy rainfall from the depression is possible in the northern Leeward Islands and Puerto Rico during the next day or so.