164  
AUUS46 KPDT 171145  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
345 AM PST SUN DEC 17 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS S-SE 1-4 MPH. SW-W 5-10 MPH.  
TRANSPORT WINDS S-SE 1-4 MPH. SW 15-25 MPH.  
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR MON DEC 18 POOR.  
 
VENTILATION INDEX (CATEGORY) 49 (POOR). 116 (POOR).  
OUTLOOK FOR MON DEC 18 139 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 0-4 MPH. SW 5-10 MPH.  
TRANSPORT WINDS W 0-4 MPH. SW 5-10 MPH.  
MIXING HEIGHT NEAR SURFACE. NEAR SURFACE.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR MON DEC 18 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 38 (POOR).  
OUTLOOK FOR MON DEC 18 25 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 0-4 MPH. S 5-10 MPH.  
TRANSPORT WINDS NW 0-4 MPH. S 5-10 MPH.  
MIXING HEIGHT NEAR SURFACE. NEAR SURFACE.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR MON DEC 18 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 63 (POOR).  
OUTLOOK FOR MON DEC 18 95 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 68 (POOR)  
ELLENSBURG 25 (POOR)  
GOLDENDALE 90 (POOR)  
TRI-CITIES 56 (POOR)  
WALLA WALLA 136 (POOR)  
YAKIMA 25 (POOR)  
BEND 70 (POOR)  
PRINEVILLE 54 (POOR)  
ENTERPRISE 25 (POOR)  
HERMISTON 25 (POOR)  
JOHN DAY 27 (POOR)  
LA GRANDE 65 (POOR)  
MADRAS 153 (POOR)  
MEACHAM 56 (POOR)  
PENDLETON 30 (POOR)  
REDMOND 99 (POOR)  
SENECA 25 (POOR)  
THE DALLES 25 (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/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT  
 
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE  
NATIONAL WEATHER SERVICE IN PENDLETON.  
 

 
 
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