031  
AUUS46 KPDT 171036  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
235 AM PST THU JAN 17 2019  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 2-6 MPH. S-SW 4-9 MPH.  
TRANSPORT WINDS NW 2-6 MPH. SW 10-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR FRI JAN 18 FAIR.  
 
VENTILATION INDEX (CATEGORY) 30 (POOR). 257 (POOR).  
OUTLOOK FOR FRI JAN 18 183 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 3-7 MPH. W 3-7 MPH.  
TRANSPORT WINDS W 3-7 MPH. SW 20-30 MPH.  
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR FRI JAN 18 POOR.  
 
VENTILATION INDEX (CATEGORY) 26 (POOR). 149 (POOR).  
OUTLOOK FOR FRI JAN 18 68 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 15-25 MPH. S 15-25 MPH.  
TRANSPORT WINDS SE 15-25 MPH. SW 20-30 MPH.  
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.  
DISPERSION CATEGORY FAIR. FAIR.  
OUTLOOK FOR FRI JAN 18 FAIR.  
 
VENTILATION INDEX (CATEGORY) 78 (POOR). 302 (FAIR).  
OUTLOOK FOR FRI JAN 18 135 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 80 (POOR)  
ELLENSBURG 99 (POOR)  
GOLDENDALE 139 (POOR)  
TRI-CITIES 223 (POOR)  
WALLA WALLA 258 (POOR)  
YAKIMA 122 (POOR)  
BEND 645 (GOOD)  
PRINEVILLE 619 (GOOD)  
ENTERPRISE 252 (POOR)  
HERMISTON 232 (POOR)  
JOHN DAY 424 (FAIR)  
LA GRANDE 273 (POOR)  
MADRAS 220 (POOR)  
MEACHAM 249 (POOR)  
PENDLETON 298 (POOR)  
REDMOND 475 (FAIR)  
SENECA 460 (FAIR)  
THE DALLES 140 (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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