633  
AUUS46 KPDT 211151  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
451 AM PDT THU OCT 21 2021  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS E 4-8 MPH. N 6-10 MPH.  
TRANSPORT WINDS E 4-8 MPH. SW 5-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR FRI OCT 22 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 174 (POOR).  
OUTLOOK FOR FRI OCT 22 138 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 3-5 MPH. E 3-6 MPH.  
TRANSPORT WINDS NW 3-5 MPH. N 2-5 MPH.  
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR FRI OCT 22 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 60 (POOR).  
OUTLOOK FOR FRI OCT 22 187 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 5-8 MPH. S 17-20 MPH.  
TRANSPORT WINDS SE 5-8 MPH. S 20-21 MPH.  
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR FRI OCT 22 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 534 (FAIR).  
OUTLOOK FOR FRI OCT 22 139 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 106 (POOR)  
ELLENSBURG 152 (POOR)  
GOLDENDALE 103 (POOR)  
TRI-CITIES 42 (POOR)  
WALLA WALLA 413 (FAIR)  
YAKIMA 68 (POOR)  
BEND 616 (GOOD)  
PRINEVILLE 647 (GOOD)  
ENTERPRISE 318 (FAIR)  
HERMISTON 61 (POOR)  
JOHN DAY 653 (GOOD)  
LA GRANDE 545 (FAIR)  
MADRAS 424 (FAIR)  
MEACHAM 493 (FAIR)  
PENDLETON 416 (FAIR)  
REDMOND 573 (FAIR)  
SENECA 632 (GOOD)  
THE DALLES 83 (POOR)  
 
METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY  
SOME OF THE FACTORS USED IN BURN DECISIONS. BURN DECISIONS ARE  
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.  
 
THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT  
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS. A VENTILATION  
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:  
HTTP://WWW.WRH.NOAA.GOV/PDT/GFORECAST/GINDEX.PHP?FCST=MIXHGT,VENTCAT,TRANSWIND,VENTINDX&VT=0,72  
 
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE  
NATIONAL WEATHER SERVICE IN PENDLETON.  

 
 
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