Rain on deep snow expected to bring runoff issues

The National Weather Service in Pendleton warned Sunday that a new, warmer storm will drop rain on top of the snow that has piled up over much of Central and Eastern Oregon, bringing potential “runoff issues.”

“A storm system will bring rain to much of the region Monday night and early Tuesday, causing increased snowmelt and runoff, especially in the lower elevations that have substantial snowpack in place,” the NWS said.

Rain amounts from one quarter to one-half inch are expected in the lower elevations. The rain and snowmelt will cause storm drains and small streams to clog with slush and ice, forecasters said

In the mountains…snow levels will increase to 3,000 to 4,000 feet along the Cascades by Monday night and near 5,000 feet early Tuesday before decreasing to 3,000 feet by Wednesday.

Precipitation amounts will range from 1 to 2 inches on Monday with additional amounts of 1 to 1.5 inches on Tuesday. The highest amounts will be near the crest of the Cascades.

“People living along small streams and in flood-prone locations should be alert for rising water and take action if needed,” forecasters said.