Thurston, OR Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Thurston.

Use the Radar Maps link provided to understand the trajectory of a storm.

Winter Weather Advisory issued December 6 at 2:09PM PST until December 8 at 4:00PM PST by NWS Pendleton OR

...LIGHT FREEZING RAIN, MOUNTAIN SNOW EXPECTED THIS WEEKEND... .A system moving across our region will bring areas of rain and some light freezing rain to portions of the lower slopes of the eastern Washington Cascades as well as the Kittitas Valley on Saturday. Then on Sunday, areas of moderate snowfall will begin to fall across the Washington Cascades as well as the northern Blue Mountains of both Washington and Oregon. * WHAT...Snow expected. Total snow accumulations of 4-6 inches. Winds gusting as high as 40 mph. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 4 PM Saturday to 4 PM PST Sunday. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow.

Dense Fog Advisory issued December 6 at 2:47PM MST until December 7 at 11:00AM MST by NWS Boise ID

* WHAT...For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...Treasure Valley Zones and the Weiser Basin. * WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday. For the Dense Fog Advisory, until 11 AM MST Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog and snow flurries could produce patchy black ice and slick roads.

Air Stagnation Advisory issued December 6 at 2:47PM MST until December 7 at 5:00PM MST by NWS Boise ID

* WHAT...An extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants in valleys. * WHERE...Portions of south central, southwest, and west central Idaho and northeast and southeast Oregon. * WHEN...Until 5 PM MST /4 PM PST/ Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

Air Stagnation Advisory issued December 6 at 2:47PM MST until December 7 at 5:00PM MST by NWS Boise ID

* WHAT...For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...Treasure Valley Zones and the Weiser Basin. * WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday. For the Dense Fog Advisory, until 11 AM MST Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog and snow flurries could produce patchy black ice and slick roads.

Winter Weather Advisory issued December 6 at 2:10PM MST until December 8 at 5:00AM MST by NWS Boise ID

* WHAT...Snow and freezing rain expected. Total snow accumulations up to one inch and ice accumulations less than one tenth of an inch. * WHERE...Lower Treasure Valley Zones, and northern Malheur County including Highways 20 and 26. * WHEN...From 5 PM MST /4 PM PST/ Saturday to 5 AM MST /4 AM PST/ Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Plan on slippery road conditions.

Air Stagnation Advisory issued December 6 at 12:24PM PST until December 7 at 4:00AM PST by NWS Portland OR

* WHAT...Air Stagnation Advisory, light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...South Willamette Valley. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

Air Stagnation Advisory issued December 6 at 12:24PM PST until December 7 at 4:00AM PST by NWS Portland OR

* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Valleys of Oregon, Lower Columbia River and Cowlitz River Valleys, Central Willamette Valley, Tualatin Valley, Outer Southeast Portland Metro, Willapa and Wahkiakum Lowlands, North Clark County Lowlands, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.

Freezing Fog Advisory issued December 6 at 10:56AM PST until December 7 at 11:00AM PST by NWS Pendleton OR

* WHAT...Visibility less than a quarter mile in freezing fog. * WHERE...North Central Oregon. * WHEN...Until 11 AM PST Saturday. * IMPACTS...Low visibility could make driving conditions hazardous.

Air Stagnation Advisory issued December 5 at 2:58PM PST until December 7 at 4:00AM PST by NWS Medford OR

* WHAT...A ridge of high pressure will lead to a strong inversion and stagnant air conditions near the surface that will continue to trap pollutants. This could worsen air quality over time. * WHERE...Valley locations across southern Oregon. West of the Cascades, this includes the Umpqua, Illinois, Applegate, and Rogue valleys. East of the Cascades, this includes Klamath Falls, Sprague River, Chiloquin, Chemult, Silver Lake, Paisley, and surrounding areas. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Low visibility could make driving conditions hazardous. Watch for icy spots on roads. Poor air quality may cause issues for people with respiratory problems.

Air Quality Alert issued December 4 at 11:37AM PST by NWS Medford OR

Oregon Department of Environmental Quality has issued an Air Pollution Advisory...in effect until 10 AM PST Thursday. The Oregon Department of Environmental Quality issued an air quality advisory for Lake County. Check current air quality conditions and advisories on DEQs Air Quality Index or by downloading the OregonAIR on your app on your smartphone. Many county health and local air agencies have also issued wood burning restrictions limiting the use of wood stoves, fireplaces and outdoor burning. There are often exceptions for those who use wood exclusively to heat their homes and those with limited income. Check with your local heath or air agency for current restrictions. People can take the following precautions to protect their health: - Follow local burn restrictions to prevent deteriorating air quality. - Avoid strenuous outdoor activity during periods of poor air quality. - People with heart or lung problems and young children are especially vulnerable. These people should stay indoors while smoke levels are high. - Use certified High Efficiency Particulate Air (HEPA) filters in indoor heating, ventilation, cooling and air purification systems. - Avoid using wood-burning stoves and other sources of indoor smoke if possible. DEQs color-coded Air Quality Index provides current air quality conditions and ranks air quality as follows: Green is good. Yellow is moderate. Orange is unhealthy for sensitive groups such as children, the elderly, pregnant women and those with respiratory conditions. Red is unhealthy for everyone. Purple is very unhealthy for all groups. Maroon is hazardous. For additional information...please visit the web site at https://oregonsmoke.org