357  
AUUS46 KPDT 071059  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
359 AM PDT TUE JUL 7 2020  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 16-23 MPH. SW 20-24 MPH.  
TRANSPORT WINDS SW 17-25 MPH. W 18-26 MPH.  
MIXING HEIGHT 4500 FT MSL. 9000 FT MSL.  
DISPERSION CATEGORY GOOD. GOOD.  
OUTLOOK FOR WED JUL 8 GOOD.  
 
VENTILATION INDEX (CATEGORY) 810 (GOOD). 1050 (GOOD).  
OUTLOOK FOR WED JUL 8 744 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 5-13 MPH. W 16-19 MPH.  
TRANSPORT WINDS W 7-13 MPH. W 12-19 MPH.  
MIXING HEIGHT 4500 FT MSL. 9000 FT MSL.  
DISPERSION CATEGORY FAIR. GOOD.  
OUTLOOK FOR WED JUL 8 FAIR.  
 
VENTILATION INDEX (CATEGORY) 395 (FAIR). 1017 (GOOD).  
OUTLOOK FOR WED JUL 8 328 (FAIR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 15-20 MPH. NW 10-12 MPH.  
TRANSPORT WINDS W 8-20 MPH. W 13-17 MPH.  
MIXING HEIGHT 6000 FT MSL. 9000 FT MSL.  
DISPERSION CATEGORY FAIR. GOOD.  
OUTLOOK FOR WED JUL 8 FAIR.  
 
VENTILATION INDEX (CATEGORY) 397 (FAIR). 781 (GOOD).  
OUTLOOK FOR WED JUL 8 369 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 849 (GOOD)  
ELLENSBURG 1050 (GOOD)  
GOLDENDALE 1050 (GOOD)  
TRI-CITIES 1050 (GOOD)  
WALLA WALLA 1050 (GOOD)  
YAKIMA 1037 (GOOD)  
BEND 579 (FAIR)  
PRINEVILLE 920 (GOOD)  
ENTERPRISE 680 (GOOD)  
HERMISTON 1050 (GOOD)  
JOHN DAY 804 (GOOD)  
LA GRANDE 870 (GOOD)  
MADRAS 752 (GOOD)  
MEACHAM 934 (GOOD)  
PENDLETON 1050 (GOOD)  
REDMOND 875 (GOOD)  
SENECA 810 (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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