Rainfall totals of 3 to 6 inches are expected from Baja California into northwestern Sonora, with up to 10 inches possible, weather.com reported.

The main hazard expected from Rosa or its remnants is very heavy rainfall in Baja California, northwestern Sonora, and the U.S. Desert Southwest, the National Hurricane Center said.

Last year, I visited the main jumping off point on the US Mexican border El Sasabe on the Sonora Arizona border. In the month of May, before the summer's searing and deadly heat, local authorities estimated a daily average of 1,000 migrants attempting to cross.