Pamela was forecast to pass well to the south of the southern tip of the Baja California peninsula during the night while accelerating its forward movement toward the coast and regaining wind strength.
The hurricane center warned of the possibility of life-threatening storm surges, flash floods and dangerous winds around the impact area.
Pamela was then forecast to weaken while crossing over northern Mexico and could approach the Texas border as a tropical depression by Thursday. The center said remnants of the storm could carry heavy rain to central Texas and southeast Oklahoma.