793
WWUS75 KBOI 182314
NPWBOI
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE BOISE ID
414 PM MST SUN JAN 18 2026
IDZ016-191800-
/O.NEW.KBOI.FG.Y.0006.260118T2314Z-260119T1800Z/
/O.CON.KBOI.AS.Y.0001.000000T0000Z-260122T1800Z/
WESTERN MAGIC VALLEY-
INCLUDING THE CITIES OF TWIN FALLS
414 PM MST SUN JAN 18 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM MST MONDAY
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST
THURSDAY...
* WHAT...FOR THE DENSE FOG ADVISORY, VISIBILITY ONE QUARTER MILE OR
LESS IN DENSE FOG. FOR THE AIR STAGNATION ADVISORY, 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...WESTERN MAGIC VALLEY.
* WHEN...FOR THE DENSE FOG ADVISORY, UNTIL 11 AM MST MONDAY. FOR THE
AIR STAGNATION ADVISORY, UNTIL 11 AM MST THURSDAY.
* IMPACTS...POOR AIR QUALITY MAY CAUSE ISSUES FOR PEOPLE WITH
RESPIRATORY PROBLEMS. LOW VISIBILITY COULD MAKE DRIVING CONDITIONS
HAZARDOUS.
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.
IF DRIVING, SLOW DOWN, USE YOUR HEADLIGHTS, AND LEAVE PLENTY OF
DISTANCE AHEAD OF YOU.
IDZ011>014-028-033-ORZ061>064-191800-
/O.CON.KBOI.AS.Y.0001.000000T0000Z-260122T1800Z/
WEST CENTRAL MOUNTAINS-LOWER TREASURE VALLEY-BOISE MOUNTAINS-
UPPER TREASURE VALLEY-CAMAS PRAIRIE-UPPER WEISER RIVER-HARNEY
COUNTY-BAKER COUNTY-MALHEUR COUNTY-OREGON LOWER TREASURE VALLEY-
INCLUDING THE CITIES OF CASCADE, FAIRFIELD, NEW PRINCETON, SELBY,
MESA, ONTARIO, WARM LAKE, DUNNEAN, BURNS, PRAIRIE, VENATOR,
MCCALL, BLAINE, HILL CITY, DIAMOND, OLA, BIG CREEK, MALHEUR CITY,
GLENDALE, BEAR, COUNCIL, GOODRICH, BUCHANAN, PINE, CALDWELL,
BOISE, CORRAL, CRANE, CUPRUM, INDIAN VALLEY, SOLDIER, ANDERSON
DAM, BAKER, FRUITVALE, CAMBRIDGE, NAMPA, AND NYSSA
414 PM MST SUN JAN 18 2026 /314 PM PST SUN JAN 18 2026/
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST /10 AM
PST/ THURSDAY...
* 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 IDAHO AND NORTHEAST AND SOUTHEAST
OREGON.
* WHEN...UNTIL 11 AM MST /10 AM PST/ THURSDAY.
* 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.
SH
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