A flood watch has been issued for parts of Northern and Central California, covering the Mariposa–Madera Lower Sierra, Yosemite, the San Joaquin River Canyon, and the Upper San Joaquin River.
The watch is scheduled to run from 4 p.m. Saturday, December 20, to 4 p.m. Friday, December 26 (local time), according to an update tied to National Weather Service (NWS) guidance reported by regional outlets.
We have started Key Messages for the Atmospheric River event into California next week. Heavy rain and mountain snow are expected across much of the state. pic.twitter.com/JM1N68f3pN
— NWS Weather Prediction Center (@NWSWPC) December 19, 2025
In the watch area, forecasters are cautioning
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