By Jon Herskovitz
AUSTIN, Texas (Reuters) - The National Weather Service placed large parts of Texas that are home to more than 10 million people under a flash flood watch on Friday due to storms expected to drop as much as 15 inches of rain in some spots through the weekend.
The warning stretches from the border with Mexico through San Antonio and into the Dallas area, a region where heavy rains and flooding in May killed more than 20 people and caused massive damage.
"Heaviest rains are expected late tonight through Saturday night with the heavy rain threat expected to shift east on
Sunday," the National Weather Service said.
Nearly 100 flights were canceled at Dallas/Fort Worth International Airport, one of the country's busiest, as of 8 a.m. CDT, according to tracking service FlightAware.com.
Storms pounded western Texas on Thursday night, causing floods that lifted mobile homes off their foundations in Rankin, about 300 miles northwest of Austin, and causing numerous road accidents in Abilene and Odessa.
The storms in Texas are caused by an upper level trough that is interacting with Hurricane Patricia, which is threatening Mexico from the Pacific, the National Weather Service said.
Hurricane Patricia strengthened into a potentially catastrophic Category 5 storm as it churned toward Mexico, having grown at an "incredible rate" in the past 12 hours, the World Meteorological Organization said on Friday.
(Reporting by Jon Herskovitz; Editing by Mohammad Zargham)