High wildfire risk forecast for this weekend around Cascades

National Weather Service officials have issued weekend red flag warnings for Oregon and Washington around the Cascade Mountains because of east winds and low humidity contributing to critical fire weather conditions.

Officials said east winds will increase late Friday night. The National Weather Service in Portland predicts east winds to reach up to 25 mph gusts, while the relative humidity could drop as low as 15 to 20%. The conditions make it easy for fires to spread quickly.

Bolt Creek Fire near Skykomish, Washington (Inciweb)

"Minimize the potential for creating sparks by obeying all burn restrictions and preventing motor vehicle engines from idling on top of dead grass along roadsides," the National Weather Service in Portland posted on Twitter Friday.

Several fires started amid similar conditions last month including the Bolt Creek Fire, which continues to burn northeast of Seattle and at times close U.S. Highway 2 near Skykomish. The highway closed again at 9 p.m. Thursday because of fire-related falling trees. Officials as of Friday afternoon had not estimated when it would reopen.

RELATED: Wildfire smoke a growing concern as locals breathe in 'moderate'-quality air for weeks

Smoke from that fire and others has also been impacting air quality around the region, which was also expected to continue over the weekend.

"It may be October, but it’s clear we’re not out of the woods when it comes to wildfire smoke and the dangers it can bring," Kaitlyn Kelly, air quality policy specialist for the Washington Department of Health, said in a statement.

Cooler weather and winds to clear some smoke were expected to arrive on Monday, officials said.

Scientists say climate change has made the West warmer and drier over the last three decades and will continue to make weather more extreme and wildfires more frequent and destructive.

WEATHER FORECAST: Smoky with record heat this weekend