131  
WWUS76 KOTX 221655  
NPWOTX  
 
URGENT - WEATHER MESSAGE  
NATIONAL WEATHER SERVICE SPOKANE WA  
955 AM PDT MON OCT 22 2018  
   
..AIR STAGNATION CONTINUES
 
 
.OUR PROLONGED PERIOD OF STABLE WEATHER WILL PERSIST UNTIL AT  
LEAST TUESDAY. LIGHT WINDS AND A STRONG INVERSION WILL HEIGHTEN  
THE POTENTIAL FOR POOR AIR QUALITY ACROSS MUCH OF CENTRAL AND  
EASTERN WASHINGTON. A SLOW IMPROVEMENT TO AIR QUALITY IS EXPECTED  
FOR MID WEEK WITH A FRONTAL SYSTEM PROVIDING A GOOD SCRUBBING OF  
THE ATMOSPHERE THURSDAY NIGHT INTO FRIDAY.  
 
WAC001-007-017-019-025-043-047-051-063-065-231700-  
/O.CON.KOTX.AS.Y.0001.000000T0000Z-181023T1700Z/  
ADAMS-CHELAN-DOUGLAS-FERRY-GRANT-LINCOLN-OKANOGAN-PEND OREILLE-  
SPOKANE-STEVENS-  
955 AM PDT MON OCT 22 2018  
 
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT  
TUESDAY...  
 
* AIR QUALITY...MODERATE. AIR QUALITY IS EXPECTED TO SLOWLY  
IMPROVE AND BE BETWEEN GOOD TO MODERATE LEVELS THROUGH MID  
WEEK, ESPECIALLY IN THE MOUNTAIN VALLEYS.  
 
* IMPACTS...PERSONS WITH RESPIRATORY ISSUES SHOULD FOLLOW THE  
ADVICE OF THEIR PHYSICIAN ON HOW TO DEAL WITH POOR AIR  
QUALITY. THERE MAY BE LOCAL RESTRICTIONS ON OUTDOOR BURNING,  
SO PLEASE CONSULT CHECK LOCAL BURN BANS BEFORE BURNING LEAVES  
OR YARD WASTE.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT  
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE  
TO UNHEALTHY LEVELS. PERSONS WITH RESPIRATORY ILLNESS SHOULD  
FOLLOW THEIR PHYSICIANS ADVICE FOR DEALING WITH HIGH LEVELS OF  
AIR POLLUTION.  
 

 
 

 
 
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