* 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.
* WHERE...Portions of southwest and west central Idaho and northeast
and southeast Oregon.
* WHEN...Until 2 PM MST /1 PM PST/ Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...Visibility has improved but patches of dense fog in the
Treasure Valley will continue until early afternoon.
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.
* WHERE...Portions of southwest and west central Idaho and southeast
Oregon.
* WHEN...Until 2 PM MST Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...Areas of freezing drizzle and freezing fog.
* WHERE...Airway Heights, Clarkston, Flowery Trail Road, Cheney,
Northport, Orin-Rice Road, Lewiston Grade, Lewiston, Gifford,
Tiger, Chewelah, Peck, Davenport, Culdesac, Kettle Falls, Newport,
Fairfield, Springdale-Hunters Road, Fruitland, Lapwai, Metaline
Falls, Alpowa Summit, Metaline, Deer Park, Ione, Pomeroy,
Rockford, and Colville.
* WHEN...Until 1 PM PST this afternoon.
* IMPACTS...Freezing drizzle and freezing fog creating slick road
conditions.
* ADDITIONAL DETAILS...Temperatures in the region are around 27 to
32 degrees with freezing drizzle and freezing fog being observed.
Spokane downtown is 34 degrees so impacts are not expected there.
Outlying areas are cooler this morning.
* WHAT...Visibility one quarter mile or less in dense fog mainly
over the higher terrain of the zone.
* WHERE...In Oregon, Eastern Columbia River Gorge of Oregon. In
Washington, Lower Columbia Basin of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility one quarter of a mile or less in freezing fog.
* WHERE...Kittitas Valley.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility and slick roads could make driving
conditions hazardous.
* WHAT...Visibility one quarter to one half mile in freezing fog.
* WHERE...In Oregon, Foothills of the Northern Blue Mountains of
Oregon, Grande Ronde Valley, Lower Columbia Basin of Oregon, and
Northern Blue Mountains of Oregon. In Washington, Yakima Valley
and Foothills of the Blue Mountains of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility and slick roads could make driving
conditions hazardous.
* WHAT...Visibility one quarter mile or less in dense fog mainly
over the higher terrain of the zone.
* WHERE...In Oregon, Eastern Columbia River Gorge of Oregon. In
Washington, Lower Columbia Basin of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility one quarter to one half mile in freezing fog.
* WHERE...In Oregon, Foothills of the Northern Blue Mountains of
Oregon, Grande Ronde Valley, Lower Columbia Basin of Oregon, and
Northern Blue Mountains of Oregon. In Washington, Yakima Valley
and Foothills of the Blue Mountains of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility and slick roads could make driving
conditions hazardous.
* WHAT...Areas of freezing drizzle and freezing fog.
* WHERE...Portions of North and North Central Idaho and Northeast
and Southeast Washington.
* WHEN...Until 2 PM PST this afternoon.
* IMPACTS...Freezing drizzle and freezing fog creating slick road
conditions.
* ADDITIONAL DETAILS...Temperatures in the region are around 27 to
32 degrees with freezing drizzle and freezing fog being observed.
Spokane downtown is 34 degrees so impacts are not expected there.
Outlying areas are cooler this morning.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Waterville, Creston, Coulee City, Harrington, Badger
Mountain Road, Mansfield, Wilbur, and Ritzville.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
In addition, below freezing temperatures could result in slick
roads and sidewalks.
* WHAT...Visibility one quarter to one half mile in dense fog.
* WHERE...Hood Canal Area.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Hazardous driving conditions due to low visibility.
* ADDITIONAL DETAILS...Areas of sub-freezing temperatures into
Tuesday morning may cause localized freezing fog.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Southwest Interior.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Hazardous driving conditions due to low visibility.
* ADDITIONAL DETAILS...Areas of sub-freezing temperatures into
Tuesday morning may cause localized freezing fog.
* WHAT...Visibility one quarter mile or less in dense freezing fog.
* WHERE...In Oregon, Foothills of the Northern Blue Mountains of
Oregon, Grande Ronde Valley, Lower Columbia Basin of Oregon, and
Northern Blue Mountains of Oregon. In Washington, Yakima Valley
and Foothills of the Blue Mountains of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
Below freezing temperatures could make for slick roads in areas
under fog.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...In Oregon, Eastern Columbia River Gorge of Oregon. In
Washington, Lower Columbia Basin of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility one quarter mile or less in dense freezing fog.
* WHERE...In Oregon, Foothills of the Northern Blue Mountains of
Oregon, Grande Ronde Valley, Lower Columbia Basin of Oregon, and
Northern Blue Mountains of Oregon. In Washington, Yakima Valley
and Foothills of the Blue Mountains of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
Below freezing temperatures could make for slick roads in areas
under fog.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...In Oregon, Eastern Columbia River Gorge of Oregon. In
Washington, Lower Columbia Basin of Washington.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...South Willamette Valley, Lower Columbia River and Cowlitz
River Valleys, Tualatin Valley, Portland West Hills and Chehalem
Mountain, East Central Willamette Valley, and South Washington
Cascade Foothills.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...In areas with temperatures below 30 degrees,
fog may freeze on surfaces and accumulate. Freezing fog is not
expected to be widespread.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...In Oregon, Inner Portland Metro. In Washington, Inner
Vancouver Metro and North Clark County Lowlands.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...In areas with temperatures below 30 degrees,
fog may freeze on surfaces and accumulate. Freezing fog is not
expected to be widespread. As the winds become easterly, fog will
lift in the eastern metro area.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...South Willamette Valley, Lower Columbia River and Cowlitz
River Valleys, Tualatin Valley, Portland West Hills and Chehalem
Mountain, East Central Willamette Valley, and South Washington
Cascade Foothills.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...In areas with temperatures below 30 degrees,
fog may freeze on surfaces and accumulate. Freezing fog is not
expected to be widespread.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...In Oregon, Inner Portland Metro. In Washington, Inner
Vancouver Metro and North Clark County Lowlands.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...In areas with temperatures below 30 degrees,
fog may freeze on surfaces and accumulate. Freezing fog is not
expected to be widespread. As the winds become easterly, fog will
lift in the eastern metro area.