464  
AUUS46 KPDT 261158  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
458 AM PDT WED SEP 26 2018  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 2-6 MPH. NW 2-5 MPH.  
TRANSPORT WINDS S 2-9 MPH. W 2-5 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR THU SEP 27 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 33 (POOR).  
OUTLOOK FOR THU SEP 27 210 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 2-6 MPH. SE 3-4 MPH.  
TRANSPORT WINDS NW 3-7 MPH. S 3-5 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR THU SEP 27 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 103 (POOR).  
OUTLOOK FOR THU SEP 27 189 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NE 1-3 MPH. N 1-3 MPH.  
TRANSPORT WINDS SE 1-3 MPH. W 1-3 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR THU SEP 27 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 40 (POOR).  
OUTLOOK FOR THU SEP 27 171 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 98 (POOR)  
ELLENSBURG 163 (POOR)  
GOLDENDALE 37 (POOR)  
TRI-CITIES 33 (POOR)  
WALLA WALLA 42 (POOR)  
YAKIMA 122 (POOR)  
BEND 51 (POOR)  
PRINEVILLE 93 (POOR)  
ENTERPRISE 52 (POOR)  
HERMISTON 25 (POOR)  
JOHN DAY 57 (POOR)  
LA GRANDE 37 (POOR)  
MADRAS 36 (POOR)  
MEACHAM 42 (POOR)  
PENDLETON 32 (POOR)  
REDMOND 70 (POOR)  
SENECA 78 (POOR)  
THE DALLES 66 (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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