618  
AUUS46 KPDT 181140  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
440 AM PDT THU JUL 18 2019  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 10-15 MPH. W 15-20 MPH.  
TRANSPORT WINDS SW 10-20 MPH. W 15-25 MPH.  
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.  
DISPERSION CATEGORY FAIR. GOOD.  
OUTLOOK FOR FRI JUL 19 FAIR.  
 
VENTILATION INDEX (CATEGORY) 241 (POOR). 1048 (GOOD).  
OUTLOOK FOR FRI JUL 19 618 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 5-10 MPH. W 10-15 MPH.  
TRANSPORT WINDS W 5-10 MPH. W 15-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR FRI JUL 19 FAIR.  
 
VENTILATION INDEX (CATEGORY) 175 (POOR). 779 (GOOD).  
OUTLOOK FOR FRI JUL 19 512 (FAIR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 5-10 MPH. NW 5-10 MPH.  
TRANSPORT WINDS W 5-10 MPH. W 15-20 MPH.  
MIXING HEIGHT 4000 FT MSL. 9000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR FRI JUL 19 GOOD.  
 
VENTILATION INDEX (CATEGORY) 218 (POOR). 864 (GOOD).  
OUTLOOK FOR FRI JUL 19 465 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 802 (GOOD)  
ELLENSBURG 1002 (GOOD)  
GOLDENDALE 705 (GOOD)  
TRI-CITIES 1050 (GOOD)  
WALLA WALLA 1050 (GOOD)  
YAKIMA 800 (GOOD)  
BEND 433 (FAIR)  
PRINEVILLE 572 (FAIR)  
ENTERPRISE 985 (GOOD)  
HERMISTON 1050 (GOOD)  
JOHN DAY 639 (GOOD)  
LA GRANDE 922 (GOOD)  
MADRAS 577 (FAIR)  
MEACHAM 968 (GOOD)  
PENDLETON 1050 (GOOD)  
REDMOND 566 (FAIR)  
SENECA 617 (GOOD)  
THE DALLES 970 (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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