MEXICO CITY (November 4, 2013) Mexico's Pacific coast was bracing Monday for the possibility of heavy rains with the arrival of fast-moving Tropical Storm Sonia.
The National Hurricane Center in Miami said late Sunday, Sonia was centered about 60 miles south-southwest of Culicacan and had maximum sustained winds of 40 miles per hour.
The U.S. National Hurricane Center in Miami said Sonia grew from a tropical depression early Sunday.
A tropical storm warning extends from Mazatlan northward to Altata on northwest Mexico's mainland.
Forecasters expect Sonia to pass south of the Baja peninsula in coming hours and near the mainland coast early Monday.
Forecasters say Sonia could unleash heavy rains and life-threatening flash floods and mudslides.