Dense Fog Advisory
URGENT - WEATHER MESSAGE
National Weather Service Sacramento CA
716 AM PST Thu Jan 22 2026
CAZ016-017-019-222000-
/O.NEW.KSTO.FG.Y.0009.260122T1516Z-260122T2000Z/
Central Sacramento Valley-Southern Sacramento Valley-Northern San
Joaquin Valley-
Including the cities of Chico, Marysville/Yuba City, Modesto,
Sacramento, Oroville, and Stockton
716 AM PST Thu Jan 22 2026
...DENSE FOG ADVISORY IN EFFECT UNTIL NOON PST TODAY...
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Central Sacramento Valley, Northern San Joaquin Valley,
and Southern Sacramento Valley.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
&&
$$
For more information, visit us at www.weather.gov/sto/
IDS
URGENT - WEATHER MESSAGE
National Weather Service Hanford CA
201 AM PST Thu Jan 22 2026
CAZ301>303-305>307-309>312-314-315-221900-
/O.NEW.KHNX.FG.Y.0011.260122T1001Z-260122T1900Z/
Los Banos - Dos Palos-Merced - Madera - Mendota-Planada - Le
Grand - Snelling-West Side of Fresno and Kings Counties-Caruthers
- San Joaquin - Selma-Fresno-Clovis-Buttonwillow - Lost Hills -
I5-Delano-Wasco-Shafter-Hanford - Corcoran - Lemoore-Visalia -
Porterville - Reedley-Bakersfield-Southeast San Joaquin Valley-
Including the cities of Porterville, Sanger, Fresno, Merced,
Delano, Lake Mcclure, Goshen, Richgrove, Kettleman City, Visalia,
Kerman, Buttonwillow, Atwater, Selma, Le Grand, Madera, Shafter,
Planada, Five Points, Lost Hills, Wasco, Los Banos, Kingsburg,
Parlier, Corcoran, Lemoore Station, Alpaugh, Hanford,
Bakersfield, Lemoore, and Tulare
201 AM PST Thu Jan 22 2026
...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM PST THIS MORNING...
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...A portion of central California.
* WHEN...Until 11 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Highways include, but are not limited to
Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165,
168, 180, and 198.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
&&
$$
EW
Air Stagnation Advisory
URGENT - WEATHER MESSAGE
National Weather Service Medford OR
725 AM PST Thu Jan 22 2026
ORZ029>031-230600-
/O.CON.KMFR.AS.Y.0001.000000T0000Z-260124T0000Z/
Klamath Basin-Northern and Eastern Klamath County and Western
Lake County-Central and Eastern Lake County-
Including the following locations...Midland, Lakeview, Gilchrist,
Valley Falls, Paisley, Bly, Adel, Olene, Klamath Falls, New Pine
Creek, Crescent, Sprague River, Altamont, Fort Rock, Beatty, and
Chemult
725 AM PST Thu Jan 22 2026
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST FRIDAY
WITHIN THE VALLEYS IN KLAMATH AND LAKE COUNTY...
* WHAT...Decreased air quality may continue. This is due to an
inversion and stagnant air conditions near the surface that will
continue to trap pollutants Within the valleys in Klamath and Lake
County.
* WHERE...The valleys of Klamath and Lake counties.
* WHEN...Until 4 PM PST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.
&&
$$
Smith
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
623 AM MST Thu Jan 22 2026
IDZ011>014-016-028-033-ORZ061>064-222200-
/O.CON.KBOI.AS.Y.0001.000000T0000Z-260123T1200Z/
West Central Mountains-Lower Treasure Valley-Boise Mountains-
Upper Treasure Valley-Western Magic Valley-Camas Prairie-Upper
Weiser River-Harney County-Baker County-Malheur County-Oregon
Lower Treasure Valley-
Including the cities of Cambridge, Selby, Indian Valley, Hill
City, Ola, Glendale, Nampa, Caldwell, Bear, Buchanan, Cascade,
Baker, Mesa, Ontario, Corral, Dunnean, Nyssa, Goodrich, Malheur
City, McCall, Warm Lake, Anderson Dam, Prairie, Soldier,
Fairfield, New Princeton, Crane, Council, Big Creek, Diamond,
Fruitvale, Blaine, Burns, Twin Falls, Cuprum, Venator, Pine, and
Boise
623 AM MST Thu Jan 22 2026 /523 AM PST Thu Jan 22 2026/
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST /4 AM
PST/ FRIDAY...
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will continue to trap pollutants.
* WHERE...Portions of south central and southwest Idaho and
northeast and southeast Oregon.
* WHEN...Until 5 AM MST /4 AM PST/ Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.
&&
$$
KA
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
931 AM MST Tue Jan 20 2026
IDZ054-059-221900-
/O.EXT.KPIH.AS.Y.0001.000000T0000Z-260122T1900Z/
Lower Snake River Plain-Franklin/Eastern Oneida Region-
Including the cities of Pocatello, Blackfoot, Shelley, Fort Hall,
Malad, Preston, American Falls, and Thatcher
931 AM MST Tue Jan 20 2026
...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL NOON MST THURSDAY...
* WHAT...Stagnant conditions will persist due to little vertical
mixing and light winds. Degraded air quality is expected to
continue as pollutants remained trapped near the surface.
* WHERE...Franklin/Eastern Oneida Region and Lower Snake River Plain.
* WHEN...Until noon MST Thursday.
* IMPACTS...Periods of air stagnation can lead to the buildup of
pollutants near the surface.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If possible, reduce or eliminate activities that contribute to air
pollution, such as outdoor burning, and the use of residential wood
burning devices. Reduce vehicle trips and vehicle idling as much as
possible. Check with local agencies for possible restrictions in
your area.
&&
$$
Visit weather.gov/pocatello for more information.
McKaughan
