988  
AUUS46 KPDT 131117  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
417 AM PDT TUE APR 13 2021  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS N 10-22 MPH. NE 23-26 MPH.  
TRANSPORT WINDS NE 7-20 MPH. NE 17-28 MPH.  
MIXING HEIGHT 2000 FT MSL. 7500 FT MSL.  
DISPERSION CATEGORY GOOD. GOOD.  
OUTLOOK FOR WED APR 14 GOOD.  
 
VENTILATION INDEX (CATEGORY) 297 (POOR). 983 (GOOD).  
OUTLOOK FOR WED APR 14 1013 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS N 17-23 MPH. NE 23-28 MPH.  
TRANSPORT WINDS N 20-30 MPH. NE 25-31 MPH.  
MIXING HEIGHT 2000 FT MSL. 8000 FT MSL.  
DISPERSION CATEGORY GOOD. GOOD.  
OUTLOOK FOR WED APR 14 GOOD.  
 
VENTILATION INDEX (CATEGORY) 521 (FAIR). 1050 (GOOD).  
OUTLOOK FOR WED APR 14 1050 (GOOD).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS N 16-19 MPH. N 18-21 MPH.  
TRANSPORT WINDS NE 10-16 MPH. NE 16-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR WED APR 14 GOOD.  
 
VENTILATION INDEX (CATEGORY) 162 (POOR). 867 (GOOD).  
OUTLOOK FOR WED APR 14 895 (GOOD).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 1050 (GOOD)  
ELLENSBURG 1050 (GOOD)  
GOLDENDALE 1050 (GOOD)  
TRI-CITIES 1050 (GOOD)  
WALLA WALLA 1004 (GOOD)  
YAKIMA 1050 (GOOD)  
BEND 804 (GOOD)  
PRINEVILLE 902 (GOOD)  
ENTERPRISE 515 (FAIR)  
HERMISTON 1050 (GOOD)  
JOHN DAY 635 (GOOD)  
LA GRANDE 806 (GOOD)  
MADRAS 1050 (GOOD)  
MEACHAM 533 (FAIR)  
PENDLETON 760 (GOOD)  
REDMOND 978 (GOOD)  
SENECA 694 (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/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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