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Dense Fog Advisory 0003
Issued by the Missoula Forecast Office

Action Issued Starts Expiration
New 2025-12-23 22:25:04 2025-12-23 22:24:00 2025-12-24 06:00:00
New 2025-12-23 22:25:04 2025-12-23 22:24:00 2025-12-24 06:00:00
Continued 2025-12-24 04:29:35 2025-12-24 06:00:00
Time and Area Extended 2025-12-24 04:29:35 2025-12-24 09:00:00
Continued 2025-12-24 04:29:35 2025-12-24 06:00:00


Action: New
Issued At: 2025-12-23 22:25:04

360 
WWUS75 KMSO 240424
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
924 PM MST Tue Dec 23 2025

IDZ007-241200-
/O.NEW.KMSO.FG.Y.0003.251224T0424Z-251224T1200Z/
Orofino/Grangeville Region-
824 PM PST Tue Dec 23 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM PST WEDNESDAY...

* WHAT...Visibility 1/2 miles in dense fog.

* WHERE...Orofino/Grangeville Region.

* WHEN...Until 4 AM PST Wednesday.

* 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.

&&

$$

IDZ010-241200-
/O.NEW.KMSO.FG.Y.0003.251224T0424Z-251224T1200Z/
Eastern Lemhi County-
924 PM MST Tue Dec 23 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 5 AM MST WEDNESDAY...

* WHAT...Visibility 1/2 miles in dense fog, Mainly from elevations 
  4300 and lower.

* WHERE...Eastern Lemhi County.

* WHEN...Until 5 AM MST Wednesday.

* 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.

&&

$$


Action: New
Issued At: 2025-12-23 22:25:04

360 
WWUS75 KMSO 240424
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
924 PM MST Tue Dec 23 2025

IDZ007-241200-
/O.NEW.KMSO.FG.Y.0003.251224T0424Z-251224T1200Z/
Orofino/Grangeville Region-
824 PM PST Tue Dec 23 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM PST WEDNESDAY...

* WHAT...Visibility 1/2 miles in dense fog.

* WHERE...Orofino/Grangeville Region.

* WHEN...Until 4 AM PST Wednesday.

* 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.

&&

$$

IDZ010-241200-
/O.NEW.KMSO.FG.Y.0003.251224T0424Z-251224T1200Z/
Eastern Lemhi County-
924 PM MST Tue Dec 23 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 5 AM MST WEDNESDAY...

* WHAT...Visibility 1/2 miles in dense fog, Mainly from elevations 
  4300 and lower.

* WHERE...Eastern Lemhi County.

* WHEN...Until 5 AM MST Wednesday.

* 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.

&&

$$


Action: Continued
Issued At: 2025-12-24 04:29:35

446 
WWUS75 KMSO 241029
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
329 AM MST Wed Dec 24 2025

MTZ005-241500-
/O.EXB.KMSO.FG.Y.0003.000000T0000Z-251224T1500Z/
Missoula/Bitterroot Valleys-
329 AM MST Wed Dec 24 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM MST THIS MORNING...

* WHAT...Visibility one quarter mile in dense fog.

* WHERE...Missoula/Bitterroot Valleys.

* WHEN...Until 8 AM MST this morning.

* 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.

&&

$$

IDZ007-241200-
/O.CON.KMSO.FG.Y.0003.000000T0000Z-251224T1200Z/
Orofino/Grangeville Region-
229 AM PST Wed Dec 24 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST EARLY THIS 
MORNING...

* WHAT...Visibility 1/2 miles in dense fog.

* WHERE...Orofino/Grangeville Region.

* WHEN...Until 4 AM PST early this morning.

* 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.

&&

$$

IDZ010-241200-
/O.CON.KMSO.FG.Y.0003.000000T0000Z-251224T1200Z/
Eastern Lemhi County-
329 AM MST Wed Dec 24 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST EARLY THIS 
MORNING...

* WHAT...Visibility 1/2 miles in dense fog, Mainly from elevations 
  4300 and lower.

* WHERE...Eastern Lemhi County.

* WHEN...Until 5 AM MST early this morning.

* 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.

&&

$$


Action: Time and Area Extended
Issued At: 2025-12-24 04:29:35

446 
WWUS75 KMSO 241029
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
329 AM MST Wed Dec 24 2025

MTZ005-241500-
/O.EXB.KMSO.FG.Y.0003.000000T0000Z-251224T1500Z/
Missoula/Bitterroot Valleys-
329 AM MST Wed Dec 24 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM MST THIS MORNING...

* WHAT...Visibility one quarter mile in dense fog.

* WHERE...Missoula/Bitterroot Valleys.

* WHEN...Until 8 AM MST this morning.

* 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.

&&

$$

IDZ007-241200-
/O.CON.KMSO.FG.Y.0003.000000T0000Z-251224T1200Z/
Orofino/Grangeville Region-
229 AM PST Wed Dec 24 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST EARLY THIS 
MORNING...

* WHAT...Visibility 1/2 miles in dense fog.

* WHERE...Orofino/Grangeville Region.

* WHEN...Until 4 AM PST early this morning.

* 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.

&&

$$

IDZ010-241200-
/O.CON.KMSO.FG.Y.0003.000000T0000Z-251224T1200Z/
Eastern Lemhi County-
329 AM MST Wed Dec 24 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST EARLY THIS 
MORNING...

* WHAT...Visibility 1/2 miles in dense fog, Mainly from elevations 
  4300 and lower.

* WHERE...Eastern Lemhi County.

* WHEN...Until 5 AM MST early this morning.

* 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.

&&

$$


Action: Continued
Issued At: 2025-12-24 04:29:35

446 
WWUS75 KMSO 241029
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
329 AM MST Wed Dec 24 2025

MTZ005-241500-
/O.EXB.KMSO.FG.Y.0003.000000T0000Z-251224T1500Z/
Missoula/Bitterroot Valleys-
329 AM MST Wed Dec 24 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM MST THIS MORNING...

* WHAT...Visibility one quarter mile in dense fog.

* WHERE...Missoula/Bitterroot Valleys.

* WHEN...Until 8 AM MST this morning.

* 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.

&&

$$

IDZ007-241200-
/O.CON.KMSO.FG.Y.0003.000000T0000Z-251224T1200Z/
Orofino/Grangeville Region-
229 AM PST Wed Dec 24 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST EARLY THIS 
MORNING...

* WHAT...Visibility 1/2 miles in dense fog.

* WHERE...Orofino/Grangeville Region.

* WHEN...Until 4 AM PST early this morning.

* 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.

&&

$$

IDZ010-241200-
/O.CON.KMSO.FG.Y.0003.000000T0000Z-251224T1200Z/
Eastern Lemhi County-
329 AM MST Wed Dec 24 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST EARLY THIS 
MORNING...

* WHAT...Visibility 1/2 miles in dense fog, Mainly from elevations 
  4300 and lower.

* WHERE...Eastern Lemhi County.

* WHEN...Until 5 AM MST early this morning.

* 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.

&&

$$



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