NORTH BEND, Wash. — An incoming storm is causing problems with traffic through the Cascade Mountain passes.

All eastbound Interstate 90 lanes were closed early Thursday morning at Denny Creek due to multiple spinouts and collisions amid heavy snowfall. The roadway reopened midmorning only to close again because of spinouts and a jackknifed semitrailer. The roadway was expected to reopen Thursday evening.

Chains are now required in the westbound lanes.

A winter storm warning has been issued for the Cascade Mountains above 3,500 feet through 10 p.m. Thursday. Ten to 20 inches of additional snow is expected during the storm.