This Afternoon: Lots of sunshine. Less wind. Increasing clouds late. Highs 61-68. West wind 10 mph or less.

Tonight: Increasing clouds with showers developing after midnight. Thunder possible. Lows 41-47. Light wind.

Saturday: Morning showers. Thunderstorms likely, especially late. A few storms could be severe.  Highs 61-70. South wind 5-15 mph.

Saturday Night: Showers and thunderstorms likely. Lows 52-57. Variable wind 5-10 mph.

Sunday: Mainly morning showers. Mostly cloudy with highs 62-67. West wind 5-15 mph and gusty.

Weather Summary:

Cool Canadian high pressure brought chilly conditions to the Tri-Cities, along with some scattered frost Friday morning.  This high is shifting eastward allowing for a return to unsettled weather this weekend.

Clouds will increase tonight. Rain chances will increase late tonight into Saturday ahead of a storm system that will intensify over the middle of the nation. Periods of rain are expected Saturday along with scattered thunderstorms. Right now rain appears most likely in the morning and again during the late afternoon/evening. Thundershowers are possible through the day, but thunderstorms are most likely late Saturday afternoon through Saturday night. A few severe storms are possible with downpours, damaging winds, and large hail. Isolated tornadoes can't be ruled out. Heavy rainfall is possible in spots with more than 1.0" predicted for some locations in the region.

Be sure to stay up-to-date with the latest forecast through the weekend and have a way to receive warnings during outdoor activities. We recommend the Storm Track 5 mobile app,, and our Facebook and Twitter feeds along with NOAA Weather Radio. We will continue to track this storm system and will alert you to severe weather dangers on-air, online, and on mobile.

Some showers will linger into Sunday, especially in the morning. It will be breezy as well.

Monday and Tuesday are looking dry, but more rain is possible Wednesday and Thursday.

Recap: Highs in the 60s to near 70 through next Friday. Lows in the 40s tonight, 50s Saturday night, near 40 Sunday night, 30s Monday night, and 40s Tuesday and Wednesday nights.

Our average high is 70°, low 45°.

Meteorologist Dave Dierks