A developing storm system forecast to swing off the Oregon and Washington coastline on Friday will add to the region's weather woes.

The effects of the so-called bomb cyclone storm on Southern California will be less dramatic compared with the north, weather forecasters say.

The Bay Area and Northern California were seeing the impacts of a storm fueled by a strong atmospheric river and intensified by a bomb cyclone off the Pacific Northwest coast. The storm was bringing heavy rainfall and damaging winds which led to a series of power outages in the region.