561  
AUUS46 KPDT 231154  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
454 AM PDT WED SEP 23 2020  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 5-10 MPH. SW 5-10 MPH.  
TRANSPORT WINDS S 5-10 MPH. SW 15-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR THU SEP 24 GOOD.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 894 (GOOD).  
OUTLOOK FOR THU SEP 24 1050 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 1-5 MPH. S 10-15 MPH.  
TRANSPORT WINDS S 5-10 MPH. SW 20-25 MPH.  
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR THU SEP 24 GOOD.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 1034 (GOOD).  
OUTLOOK FOR THU SEP 24 1050 (GOOD).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 1-5 MPH. S 10-15 MPH.  
TRANSPORT WINDS SE 1-5 MPH. S 15-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 10000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR THU SEP 24 GOOD.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 1050 (GOOD).  
OUTLOOK FOR THU SEP 24 831 (GOOD).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 278 (POOR)  
ELLENSBURG 657 (GOOD)  
GOLDENDALE 729 (GOOD)  
TRI-CITIES 990 (GOOD)  
WALLA WALLA 698 (GOOD)  
YAKIMA 1029 (GOOD)  
BEND 1050 (GOOD)  
PRINEVILLE 1050 (GOOD)  
ENTERPRISE 967 (GOOD)  
HERMISTON 946 (GOOD)  
JOHN DAY 906 (GOOD)  
LA GRANDE 1050 (GOOD)  
MADRAS 1050 (GOOD)  
MEACHAM 1050 (GOOD)  
PENDLETON 1042 (GOOD)  
REDMOND 1050 (GOOD)  
SENECA 879 (GOOD)  
THE DALLES 580 (FAIR)  
 
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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