Steady rainfall is not a new thing in the Pacific Northwest. But the next round, which begins Tuesday, could cause flooding.
Setup
A slow-moving cold front is approaching the region from the Pacific Ocean. There’s enough moisture and instability to produce persistent rainfall for a few days. Rain may be heavy at times and thunderstorms could pop up in some places along the Interstate 5 corridor from Seattle to Portland, Oregon.
There’s potential for 3 to 6 inches of total rainfall over the...