National Weather Service Advisory. A strong storm with an atmospheric river origin will impact Southwest Oregon and Northwest California beginning late Monday night and lasting through Wednesday evening. Unlike the last storm, snow levels will already be high (between 7500 and 8500 feet or even higher). This storm has a long moisture fetch along with a southwest flow. The combination of the two will allow more moisture to get wrung out due to upslope flow over the south Coastal mountains and possibly western Siskiyou County. Even though this storm will be mostly a rain event, the eastside will still start the event cold due to an existing snowpack, therefore there is a risk for freezing rain Monday night before the winds scour out the colder air on Tuesday. In addition moderate to strong winds could impact the coast, Shasta Valley and east of the Cascades, especially near Summer Lake. Keep in mind this event is still several days out therefore details on timing, rainfall amounts and areas where the strongest winds will occur could change.
