Rain tapered off across Washington state and British Columbia on Thursday after a potent storm pushed rivers beyond their banks and left roads, towns and farmland submerged in floodwaters that aren’t expected to recede for days.

But more rain is on the way, forecasters said, with another storm set to approach the region as early as Sunday night and last into early next week.

The details are still uncertain, but forecasters said the most likely scenario was that the next storm would be less intense than the one that led to mass evacuations in Western Washington this week.

At this point, though, even a small amount of rain can have a bigger-than-usual impact.

“The risk is that we are already pretty saturated,” said Harrison Rademacher, a meteorologist with the National Weather Service of

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