A moisture-rich atmospheric river is forecast to hit California on Sunday and Monday, delivering a much needed drenching of rain to a drought-plagued state at a time of year when big storms are unusual.

It’s unclear at this point where the bull’s-eye of the storm will dump the most rain, but forecasters agree it will likely be anywhere from far Northern California to Central California, with the San Francisco Bay Area being impacted. The wettest spots could see up to a foot of rain.