884  
AUUS46 KPDT 091239  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
439 AM PST FRI DEC 9 2022  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 4-12 MPH. SE 5-11 MPH.  
TRANSPORT WINDS SW 6-12 MPH. SE 6-17 MPH.  
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR SAT DEC 10 GOOD.  
 
VENTILATION INDEX (CATEGORY) 56 (POOR). 83 (POOR).  
OUTLOOK FOR SAT DEC 10 241 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 1-5 MPH. E 3-6 MPH.  
TRANSPORT WINDS W 1-5 MPH. SE 1-7 MPH.  
MIXING HEIGHT NEAR SURFACE. NEAR SURFACE.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR SAT DEC 10 POOR.  
 
VENTILATION INDEX (CATEGORY) 26 (POOR). 26 (POOR).  
OUTLOOK FOR SAT DEC 10 31 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 6-9 MPH. S 12-17 MPH.  
TRANSPORT WINDS SW 6-11 MPH. S 15-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SAT DEC 10 FAIR.  
 
VENTILATION INDEX (CATEGORY) 38 (POOR). 178 (POOR).  
OUTLOOK FOR SAT DEC 10 539 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 84 (POOR)  
ELLENSBURG 25 (POOR)  
GOLDENDALE 30 (POOR)  
TRI-CITIES 25 (POOR)  
WALLA WALLA 102 (POOR)  
YAKIMA 25 (POOR)  
BEND 386 (FAIR)  
PRINEVILLE 307 (FAIR)  
ENTERPRISE 39 (POOR)  
HERMISTON 25 (POOR)  
JOHN DAY 221 (POOR)  
LA GRANDE 114 (POOR)  
MADRAS 329 (FAIR)  
MEACHAM 246 (POOR)  
PENDLETON 176 (POOR)  
REDMOND 296 (POOR)  
SENECA 271 (POOR)  
THE DALLES 30 (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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