weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

Dense Fog Advisory


URGENT - WEATHER MESSAGE
National Weather Service Boise ID
832 AM MST Thu Dec 5 2024

IDZ012-014-ORZ064-062215-
/O.CON.KBOI.AS.Y.0002.000000T0000Z-241208T0000Z/
/O.CON.KBOI.FG.Y.0015.000000T0000Z-241206T2100Z/
Lower Treasure Valley ID-Upper Treasure Valley-Oregon Lower
Treasure Valley-
Including the cities of Caldwell, Mountain Home, Nampa, Ontario,
Nyssa, and Boise
832 AM MST Thu Dec 5 2024

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY
IN VALLEYS...
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST FRIDAY...

* 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.

* WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday.
  For the Dense Fog Advisory, until 2 PM MST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous
  especially for the morning commute. Poor air quality may cause
  issues for people with respiratory problems. Low visibility could
  make driving conditions hazardous.

* ADDITIONAL DETAILS...Fog could produce patchy black ice and slick
  roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

State air quality agencies highly recommend that no outdoor burning
occur and that residential wood burning devices be limited as much
as possible. According to state air quality agencies, prolonged
periods of stagnant air can hold pollutants close to the ground
where people live and breathe. Check with your local burn agency for
any current restrictions in your area.

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
832 AM MST Thu Dec 5 2024

IDZ033-062215-
/O.EXA.KBOI.FG.Y.0015.000000T0000Z-241206T2100Z/
/O.CON.KBOI.AS.Y.0002.000000T0000Z-241208T0000Z/
Upper Weiser River-
Including the cities of Midvale, Cambridge, and Council
832 AM MST Thu Dec 5 2024

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM MST FRIDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY
IN VALLEYS...

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or
  less in dense fog. 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.

* WHERE...Upper Weiser River.

* WHEN...For the Dense Fog Advisory, until 2 PM MST Friday. For the
  Air Stagnation Advisory, until 5 PM MST Saturday.

* IMPACTS...Low visibility could make driving conditions hazardous
  especially for the morning commute. Poor air quality may cause
  issues for people with respiratory problems. Low visibility could
  make driving conditions hazardous.

* ADDITIONAL DETAILS...Fog could produce patchy black ice and slick
  roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

State air quality agencies highly recommend that no outdoor burning
occur and that residential wood burning devices be limited as much
as possible. According to state air quality agencies, prolonged
periods of stagnant air can hold pollutants close to the ground
where people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$


Freezing Fog Advisory


URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
503 PM MST Thu Dec 5 2024

MTZ005-061800-
/O.NEW.KMSO.ZF.Y.0003.241206T0003Z-241206T1800Z/
Missoula/Bitterroot Valleys-
503 PM MST Thu Dec 5 2024

...FREEZING FOG ADVISORY IN EFFECT UNTIL 11 AM MST FRIDAY...

* WHAT...Visibility to one quarter mile in freezing fog.

* WHERE...Missoula/Bitterroot Valleys.

* WHEN...Until 11 AM MST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.
  Watch out for black ice, particularly on bridges.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

AL


High Wind Watch


URGENT - WEATHER MESSAGE
National Weather Service Great Falls MT
206 PM MST Thu Dec 5 2024

MTZ301>303-307-308-061215-
/O.CON.KTFX.HW.A.0021.241207T0000Z-241208T1800Z/
East Glacier Park Region-Northern High Plains-Eastern Glacier,
Western Toole, and Central Pondera-Southern Rocky Mountain Front-
Southern High Plains-
Including the following locations: Babb, Cut Bank, Santa Rita,
Rogers Pass, Heart Butte, East Glacier Park, Logan Pass, Saint
Mary, Dupuyer, Ethridge, Choteau, Browning, Kiowa, Bynum,
Pendroy, and Marias Pass
206 PM MST Thu Dec 5 2024

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON THROUGH
SUNDAY MORNING...

* WHAT...Southwest winds 35 to 45 mph with gusts up to 80 mph
  possible.

* WHERE...The Rocky Mountain Front and adjacent foothills and
  plains, and Eastern Glacier, Western Toole, and Central Pondera
  Counties.

* WHEN...From Friday afternoon through Sunday morning.

* IMPACTS...Damaging winds may blow down trees and power lines.
  Power outages are possible. Travel could be very difficult,
  especially for high profile vehicles.

* ADDITIONAL DETAILS...The strongest winds are expected to occur
  Saturday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

Remember, a High Wind Watch means that there is at least a 50%
chance of 40 mph sustained winds or 58 mph wind gusts occurring
during the watch period.

&&

$$

Ludwig

URGENT - WEATHER MESSAGE
National Weather Service Great Falls MT
206 PM MST Thu Dec 5 2024

MTZ312>314-318-061215-
/O.EXB.KTFX.HW.A.0021.241208T0000Z-241209T0000Z/
Cascade County below 5000ft-Judith Basin County and Judith Gap-
Fergus County below 4500ft-Snowy and Judith Mountains-
Including the following locations: Stanford, Benchland, Hilger,
Hobson, Raynesford, Lewistown, Great Falls, Windham, Geyser, and
Moccasin
206 PM MST Thu Dec 5 2024

...HIGH WIND WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH SUNDAY
AFTERNOON...

* WHAT...West winds 25 to 35 mph with gusts up to 60 mph possible.

* WHERE...Snowy and Judith Mountains, Cascade County below 5000ft,
  Fergus County below 4500ft, and Judith Basin County and Judith Gap.

* WHEN...From Saturday afternoon through Sunday afternoon.

* IMPACTS...High winds may move loose debris, damage property and
  cause power outages. Travel could be difficult, especially for
  high profile vehicles.

* ADDITIONAL DETAILS...The strongest winds are expected to occur
  Saturday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

Remember, a High Wind Watch means that there is at least a 50%
chance of 40 mph sustained winds or 58 mph wind gusts occurring
during the watch period.

&&

$$


Air Stagnation Advisory


URGENT - WEATHER MESSAGE
National Weather Service Boise ID
832 AM MST Thu Dec 5 2024

IDZ011-013-016-028-ORZ061>063-062215-
/O.CON.KBOI.AS.Y.0002.000000T0000Z-241208T0000Z/
West Central Mountains-Boise Mountains-Western Magic Valley-Camas
Prairie-Harney County-Baker County-Malheur County-
Including the cities of Dunnean, Baker, Garden Valley, Burns,
Cascade, Crane, Idaho City, Pine, McCall, Buchanan, New
Princeton, Lowman, Fairfield, Twin Falls, Jerome, Malheur City,
Venator, and Diamond
832 AM MST Thu Dec 5 2024 /732 AM PST Thu Dec 5 2024/

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST /4 PM
PST/ SATURDAY IN VALLEYS...

* 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

State air quality agencies highly recommend that no outdoor burning
occur and that residential wood burning devices be limited as much
as possible. According to state air quality agencies, prolonged
periods of stagnant air can hold pollutants close to the ground
where people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

ST

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
832 AM MST Thu Dec 5 2024

IDZ012-014-ORZ064-062215-
/O.CON.KBOI.AS.Y.0002.000000T0000Z-241208T0000Z/
/O.CON.KBOI.FG.Y.0015.000000T0000Z-241206T2100Z/
Lower Treasure Valley ID-Upper Treasure Valley-Oregon Lower
Treasure Valley-
Including the cities of Caldwell, Mountain Home, Nampa, Ontario,
Nyssa, and Boise
832 AM MST Thu Dec 5 2024

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY
IN VALLEYS...
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST FRIDAY...

* 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.

* WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday.
  For the Dense Fog Advisory, until 2 PM MST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous
  especially for the morning commute. Poor air quality may cause
  issues for people with respiratory problems. Low visibility could
  make driving conditions hazardous.

* ADDITIONAL DETAILS...Fog could produce patchy black ice and slick
  roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

State air quality agencies highly recommend that no outdoor burning
occur and that residential wood burning devices be limited as much
as possible. According to state air quality agencies, prolonged
periods of stagnant air can hold pollutants close to the ground
where people live and breathe. Check with your local burn agency for
any current restrictions in your area.

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
832 AM MST Thu Dec 5 2024

IDZ033-062215-
/O.EXA.KBOI.FG.Y.0015.000000T0000Z-241206T2100Z/
/O.CON.KBOI.AS.Y.0002.000000T0000Z-241208T0000Z/
Upper Weiser River-
Including the cities of Midvale, Cambridge, and Council
832 AM MST Thu Dec 5 2024

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM MST FRIDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY
IN VALLEYS...

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or
  less in dense fog. 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.

* WHERE...Upper Weiser River.

* WHEN...For the Dense Fog Advisory, until 2 PM MST Friday. For the
  Air Stagnation Advisory, until 5 PM MST Saturday.

* IMPACTS...Low visibility could make driving conditions hazardous
  especially for the morning commute. Poor air quality may cause
  issues for people with respiratory problems. Low visibility could
  make driving conditions hazardous.

* ADDITIONAL DETAILS...Fog could produce patchy black ice and slick
  roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

State air quality agencies highly recommend that no outdoor burning
occur and that residential wood burning devices be limited as much
as possible. According to state air quality agencies, prolonged
periods of stagnant air can hold pollutants close to the ground
where people live and breathe. Check with your local burn agency for
any current restrictions in your area.

&&

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE