Dolores, located 165 miles (265 km) southwest of the popular tourist resort of Acapulco, is heading northwest at 10 miles per hour (16 kmh), the Miami-based NHC said.
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Forecasters say a strengthening Dolores should reach hurricane status sometime Monday as it tracks roughly parallel to the coast off southwestern Mexico.
The hurricane center said Sunday afternoon that conditions were only marginally conducive for tropical development over the next five days and put the odds at 20 precent.
It could become either a tropical or subtropical depression or a storm, depending on whether it partially or fully acquires tropical characteristics.
Therefore, a tropical storm watch was issued for parts of the Mexican coast.
The area of low pressure set to push off the southern mid-Atlantic coast by Sunday is being monitored for eventual tropical development by AccuWeather meteorologists. Outer rain bands are expected to produce rainfall accumulations of 1 to 3 in (25 to 75 mm) along the southwestern coast of Mexico, from the state of Oaxaca to Nayarit, with isolated rainfall amounts expected to reach 5 in (125 mm). High surf and risky rip currents are also risks.
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There have already been two tropical systems in the Atlantic so far this season – but both made landfall in the United States.
