268  
AUUS46 KPDT 191054  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
254 AM PST SUN NOV 19 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS VRBL 0-4 MPH. S 8-15 MPH.  
TRANSPORT WINDS VRBL 0-4 MPH. SW 30-40 MPH.  
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR MON NOV 20 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 277 (POOR).  
OUTLOOK FOR MON NOV 20 50 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 2-6 MPH. SW 8-15 MPH.  
TRANSPORT WINDS W 2-6 MPH. SW 25-35 MPH.  
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR MON NOV 20 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 281 (POOR).  
OUTLOOK FOR MON NOV 20 27 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 10-20 MPH. S 12-22 MPH.  
TRANSPORT WINDS SE 10-20 MPH. SW 30-40 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR MON NOV 20 POOR.  
 
VENTILATION INDEX (CATEGORY) 57 (POOR). 255 (POOR).  
OUTLOOK FOR MON NOV 20 79 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 65 (POOR)  
ELLENSBURG 120 (POOR)  
GOLDENDALE 136 (POOR)  
TRI-CITIES 204 (POOR)  
WALLA WALLA 458 (FAIR)  
YAKIMA 146 (POOR)  
BEND 363 (FAIR)  
PRINEVILLE 304 (FAIR)  
ENTERPRISE 165 (POOR)  
HERMISTON 134 (POOR)  
JOHN DAY 154 (POOR)  
LA GRANDE 271 (POOR)  
MADRAS 411 (FAIR)  
MEACHAM 256 (POOR)  
PENDLETON 243 (POOR)  
REDMOND 332 (FAIR)  
SENECA 123 (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/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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