524
WWUS75 KBOI 191739
NPWBOI
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE BOISE ID
1039 AM MST MON JAN 19 2026
IDZ016-202100-
/O.EXP.KBOI.FG.Y.0006.000000T0000Z-260119T1800Z/
/O.CON.KBOI.AS.Y.0001.000000T0000Z-260122T1800Z/
WESTERN MAGIC VALLEY-
INCLUDING THE CITIES OF TWIN FALLS
1039 AM MST MON JAN 19 2026
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST
THURSDAY...
..DENSE FOG ADVISORY WILL EXPIRE AT 11 AM MST THIS MORNING
* 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...WESTERN MAGIC VALLEY.
* WHEN...UNTIL 11 AM MST 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.
IDZ011>014-028-033-ORZ061>064-202100-
/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 FAIRFIELD, CORRAL, BLAINE, GOODRICH,
ONTARIO, SOLDIER, MALHEUR CITY, BURNS, GLENDALE, NYSSA, ANDERSON
DAM, COUNCIL, NEW PRINCETON, CALDWELL, FRUITVALE, HILL CITY,
PINE, VENATOR, BUCHANAN, NAMPA, PRAIRIE, BOISE, CASCADE, MCCALL,
INDIAN VALLEY, WARM LAKE, BEAR, SELBY, DIAMOND, DUNNEAN, OLA,
CAMBRIDGE, BIG CREEK, BAKER, CRANE, MESA, AND CUPRUM
1039 AM MST MON JAN 19 2026 /939 AM PST MON JAN 19 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.
JDS
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