After a heavy helping of snow across the west last week we are running into our next active pattern which has already begun as a frontal boundary is moving it’s way onshore to the west coast.

An atmospheric river set-up will continue to pump moisture into the west coast over the next couple of days and we could see some significant heavy rain and high mountain snow totals.

Forecast

This Sunday afternoon, rain is expected along the coast and some snow in the higher elevation and cooler spots.

Into this evening a constant flow of moisture continues to push into northern California and into western Oregon and this will potentially bring in some flooding concern. There are flood watches in place for these areas, these regions could see between 3-9″ storm totals.

Into Monday, the frontal boundary breaks down a bit but additional pushes of moisture in the upper levels will rain out onshore. Snow continues to fall into the Cascades.

By Monday night, we are still dealing with consistent heavy rain along the I-5 corridor but it starts to become more scattered through the overnight hours.

By Tuesday afternoon, additional snow moves into Idaho and western Montana.

Forecast Accumulation

This will bring significant totals to the west coast. Rain totals may be up to 3-9″ in places like southwestern Oregon and into northern California.

Snowfall will be heavy at times as well with this moisture pushing on shore and going up in elevation we will see the highest accumulations in the mountain peaks.

Weather Alerts

Winter Weather Alerts

For the snow through today we have avalanche warnings into the Cascades of Washington and winter weather advisories extending as far south as the Sierra Nevada as some snow has already started to accumulate to areas that saw significant amounts from our last system.

Flooding Alerts

For the flooding threat there are watches in place for the places that are expecting the highest rainfall totals and consistent rain through Tuesday.

For the latest on this forecast be sure to tune into WeatherNation during our top stories or in the Western regional forecast 50 minutes past the hours.