929  
AUUS46 KPDT 261216  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
516 AM PDT WED APR 26 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 5-17 MPH. SW 16-26 MPH.  
TRANSPORT WINDS SW 10-24 MPH. W 22-27 MPH.  
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.  
DISPERSION CATEGORY FAIR. GOOD.  
OUTLOOK FOR THU APR 27 GOOD.  
 
VENTILATION INDEX (CATEGORY) 251 (POOR). 1002 (GOOD).  
OUTLOOK FOR THU APR 27 1046 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 2-12 MPH. W 15-23 MPH.  
TRANSPORT WINDS SW 4-16 MPH. W 18-22 MPH.  
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR THU APR 27 GOOD.  
 
VENTILATION INDEX (CATEGORY) 135 (POOR). 1029 (GOOD).  
OUTLOOK FOR THU APR 27 1050 (GOOD).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 0-5 MPH. W 14-16 MPH.  
TRANSPORT WINDS SW 6-10 MPH. W 11-15 MPH.  
MIXING HEIGHT 4500 FT MSL. 7500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR THU APR 27 GOOD.  
 
VENTILATION INDEX (CATEGORY) 120 (POOR). 321 (FAIR).  
OUTLOOK FOR THU APR 27 1050 (GOOD).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 956 (GOOD)  
ELLENSBURG 1050 (GOOD)  
GOLDENDALE 1050 (GOOD)  
TRI-CITIES 1050 (GOOD)  
WALLA WALLA 844 (GOOD)  
YAKIMA 957 (GOOD)  
BEND 973 (GOOD)  
PRINEVILLE 842 (GOOD)  
ENTERPRISE 275 (POOR)  
HERMISTON 1050 (GOOD)  
JOHN DAY 299 (POOR)  
LA GRANDE 342 (FAIR)  
MADRAS 892 (GOOD)  
MEACHAM 528 (FAIR)  
PENDLETON 1022 (GOOD)  
REDMOND 964 (GOOD)  
SENECA 355 (FAIR)  
THE DALLES 909 (GOOD)  
 
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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