Motorists outside their vehicles wait for heavy equipment operators to clear Highway 62 in Morongo Valley, where a flash flood swept across the road and forced its closure, Sunday Aug. 25, 2013. Palm Desert Patch photo by Guy McCarthy.
A flash flood watch has been issued for Thursday afternoon and Thursday evening in the Coachella Valley and the mountains that stand on both sides of the San Gorgonio Pass.
The watch is for all the mountains and deserts of southwest California, according to the National Weather Service.
"Another surge of subtropical air will spread into Southern California during the day on Thursday . . . with scattered thunderstorms likely developing during the afternoon," the Weather Service advised.
"These thunderstorms will be capable of producing very heavy rainfall . . . with flash flooding or debris flows possible. . . . In addition to flash flooding . . . heavy rainfall could cause mud and debris flows in and below burn areas of the past couple of years."
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