899  
AUUS46 KPDT 201230  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
530 AM PDT WED SEP 20 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 6-12 MPH. W 10-17 MPH.  
TRANSPORT WINDS SW 12-18 MPH. SW 17-28 MPH.  
MIXING HEIGHT 2000 FT MSL. 7000 FT MSL.  
DISPERSION CATEGORY FAIR. GOOD.  
OUTLOOK FOR THU SEP 21 FAIR.  
 
VENTILATION INDEX (CATEGORY) 287 (POOR). 915 (GOOD).  
OUTLOOK FOR THU SEP 21 744 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS E 2-5 MPH. SW 8-12 MPH.  
TRANSPORT WINDS SW 3-9 MPH. W 12-19 MPH.  
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR THU SEP 21 FAIR.  
 
VENTILATION INDEX (CATEGORY) 34 (POOR). 617 (GOOD).  
OUTLOOK FOR THU SEP 21 418 (FAIR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 5-5 MPH. W 13-14 MPH.  
TRANSPORT WINDS NW 3-6 MPH. W 14-18 MPH.  
MIXING HEIGHT 4000 FT MSL. 9000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR THU SEP 21 GOOD.  
 
VENTILATION INDEX (CATEGORY) 39 (POOR). 680 (GOOD).  
OUTLOOK FOR THU SEP 21 593 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 658 (GOOD)  
ELLENSBURG 656 (GOOD)  
GOLDENDALE 819 (GOOD)  
TRI-CITIES 739 (GOOD)  
WALLA WALLA 753 (GOOD)  
YAKIMA 417 (FAIR)  
BEND 1050 (GOOD)  
PRINEVILLE 1050 (GOOD)  
ENTERPRISE 1050 (GOOD)  
HERMISTON 1050 (GOOD)  
JOHN DAY 818 (GOOD)  
LA GRANDE 671 (GOOD)  
MADRAS 1050 (GOOD)  
MEACHAM 660 (GOOD)  
PENDLETON 996 (GOOD)  
REDMOND 1050 (GOOD)  
SENECA 1050 (GOOD)  
THE DALLES 1050 (GOOD)  
 
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/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT  
 
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE  
NATIONAL WEATHER SERVICE IN PENDLETON.  

 
 
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