830  
AUUS46 KPDT 151206  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
506 AM PDT MON OCT 15 2018  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS VAR 1-4 MPH. N 2-5 MPH.  
TRANSPORT WINDS SE 2-5 MPH. NE 3-6 MPH.  
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR TUE OCT 16 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 106 (POOR).  
OUTLOOK FOR TUE OCT 16 129 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 1-4 MPH. SE 2-4 MPH.  
TRANSPORT WINDS S 1-4 MPH. NE 2-5 MPH.  
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR TUE OCT 16 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 101 (POOR).  
OUTLOOK FOR TUE OCT 16 91 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 0-3 MPH. N 1-4 MPH.  
TRANSPORT WINDS S 2-5 MPH. NE 4-6 MPH.  
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR TUE OCT 16 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 109 (POOR).  
OUTLOOK FOR TUE OCT 16 147 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 65 (POOR)  
ELLENSBURG 87 (POOR)  
GOLDENDALE 119 (POOR)  
TRI-CITIES 90 (POOR)  
WALLA WALLA 98 (POOR)  
YAKIMA 87 (POOR)  
BEND 186 (POOR)  
PRINEVILLE 241 (POOR)  
ENTERPRISE 163 (POOR)  
HERMISTON 97 (POOR)  
JOHN DAY 98 (POOR)  
LA GRANDE 109 (POOR)  
MADRAS 177 (POOR)  
MEACHAM 104 (POOR)  
PENDLETON 123 (POOR)  
REDMOND 270 (POOR)  
SENECA 109 (POOR)  
THE DALLES 204 (POOR)  
 
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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