A cold dip in the jet stream (we call it an upper-level trough) slides down out of British Columbia and lingers west of the Pacific Northwest coastline Saturday through next Wednesday. This will send waves of showers onshore all 5 days, although there will be fewer showers Tuesday-Wednesday
Mark Nelsen is the Chief Meteorologist at KPTV Fox 12 Oregon. A weather enthusiast and lifelong resident of the Northwest, Mark focuses on regional interests, climate change, and environmental issues, while also covering topics related to travel and tourism in Oregon and Portland. He has been featured in various segments and discussions, bringing over 30 years of experience in PDX television to his reporting.