Cooler and Unsettled Weather Pattern Expected through the Weekend with Rain and Thunderstorms Possible

Tonight through Wednesday Night:

Expect a shift to more unsettled weather starting tomorrow. A weak weather system is moving into western Oregon, with cooler temperatures on the way. Clouds are developing along the eastern slopes of the Oregon Cascades and in parts of the northern Blue Mountains and Wallowas. While there's some instability, the air is dry, so showers or thunderstorms are unlikely tonight. Overnight lows in the 50s.

Tomorrow afternoon, there's a slight chance of isolated thunderstorms, mainly in the Washington Cascades and the John Day Highlands. Another weather system will approach by Wednesday, bringing more cool and unsettled conditions, though chances of rain remain low. Temperatures will continue to drop anywhere from 5 to 10 degrees below normal for this time of year.

Thursday through Monday:

A cooler and more unsettled weather pattern is expected to dominate from Thursday through the weekend. Here’s what to expect:

• Temperatures : Cooler than usual through the weekend, with a chance of more average temperatures returning early next week.

• Rain Chances : Daily rain chances range from 15% to 60% Thursday through Saturday, with the highest chances in the eastern mountains and upper slopes of the Cascades. Central Oregon and the Oregon Cascades have a 60-80% chance of rain on Thursday and Thursday night.

• Thunderstorms : Slight chances (15-25%) of thunderstorms on Thursday and Friday in the eastern mountains and parts of the Cascades.

A large weather system will move in from the coast of British Columbia, bringing cooler temperatures and increased moisture. Expect the wettest conditions on Thursday and Friday, with a good chance of significant rain, especially in central Oregon and the Oregon Cascades.

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