614  
AUUS46 KPDT 291152  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
452 AM PDT SAT APR 29 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 4-9 MPH. SW-W 6-12 MPH.  
TRANSPORT WINDS SE 4-9 MPH. SW 15-25 MPH.  
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN APR 30 GOOD.  
 
VENTILATION INDEX (CATEGORY) 77 (POOR). 540 (FAIR).  
OUTLOOK FOR SUN APR 30 1048 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 2-6 MPH. S 3-7 MPH.  
TRANSPORT WINDS SW 2-6 MPH. W 15-25 MPH.  
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN APR 30 GOOD.  
 
VENTILATION INDEX (CATEGORY) 50 (POOR). 444 (FAIR).  
OUTLOOK FOR SUN APR 30 1044 (GOOD).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 0-4 MPH. SE 3-7 MPH.  
TRANSPORT WINDS NW 0-4 MPH. W 15-25 MPH.  
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN APR 30 GOOD.  
 
VENTILATION INDEX (CATEGORY) 46 (POOR). 457 (FAIR).  
OUTLOOK FOR SUN APR 30 966 (GOOD).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 307 (FAIR)  
ELLENSBURG 397 (FAIR)  
GOLDENDALE 333 (FAIR)  
TRI-CITIES 548 (FAIR)  
WALLA WALLA 507 (FAIR)  
YAKIMA 364 (FAIR)  
BEND 411 (FAIR)  
PRINEVILLE 461 (FAIR)  
ENTERPRISE 402 (FAIR)  
HERMISTON 549 (FAIR)  
JOHN DAY 463 (FAIR)  
LA GRANDE 466 (FAIR)  
MADRAS 465 (FAIR)  
MEACHAM 517 (FAIR)  
PENDLETON 476 (FAIR)  
REDMOND 443 (FAIR)  
SENECA 484 (FAIR)  
THE DALLES 164 (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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