A slight respite from hot, dry weather Monday slowed the hunger for acreage among Oregon’s eight major wildfires, but an ominous forecast loomed as the state welcomed outside help.

Oregon’s largest blaze, the Cow Valley Fire along the state’s desolate eastern flank, stood at 132,528 acres Monday, with 5% containment reported late Monday along its 163-mile perimeter, according to the U.S. Forest Service, other federal agencies and state fire officials.

When it surpassed 100,000 acres sometime…