According to the National Weather Service, a flash flood watch will be put into effect starting Wednesday afternoon, March 21, until Thursday evening, March 22.
Excessive rainfall is expected over Central California's interior including the sierra foothills, and mountains below 8000 feet in elevation.
Due to an approaching atmospheric storm arriving from Hawaii, heavy rainfall in addition to snow melt, will create excess runoff and bring a threat of localized flash flooding, mudslides, rock slides and debris flows.
Residents and motorists in the areas of the Detwiler and Railroad burn should exercise extra caution.
The weather service warns some roads may become impassable or washed out and residents should be on alert for rising waters in area streams.
A flash flood watch means conditions may develop that lead to flash flooding and it is important to remember flash floods can be extremely dangerous. If a warning is issued be prepared to take action.
Areas effected by the warning are Mariposa, Madera, and Fresno County Foothills, as well as, Yosemite.
For updates on road conditions call Cal Trans: 1-800-427-7623