705  
AUUS46 KPDT 221042  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
342 AM PDT SAT JUL 22 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS VRB 3-6 MPH. W 4-9 MPH.  
TRANSPORT WINDS VRB 4-7 MPH. SW 6-12 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY FAIR. FAIR.  
OUTLOOK FOR SUN JUL 23 GOOD.  
 
VENTILATION INDEX (CATEGORY) 106 (POOR). 493 (FAIR).  
OUTLOOK FOR SUN JUL 23 656 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 3-7 MPH. S 3-7 MPH.  
TRANSPORT WINDS W 4-8 MPH. SW 5-10 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SUN JUL 23 FAIR.  
 
VENTILATION INDEX (CATEGORY) 42 (POOR). 409 (FAIR).  
OUTLOOK FOR SUN JUL 23 463 (FAIR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS VRB 2-5 MPH. N 5-10 MPH.  
TRANSPORT WINDS VRB 3-6 MPH. NW 6-12 MPH.  
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN JUL 23 GOOD.  
 
VENTILATION INDEX (CATEGORY) 26 (POOR). 345 (FAIR).  
OUTLOOK FOR SUN JUL 23 561 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 422 (FAIR)  
ELLENSBURG 690 (GOOD)  
GOLDENDALE 387 (FAIR)  
TRI-CITIES 462 (FAIR)  
WALLA WALLA 501 (FAIR)  
YAKIMA 408 (FAIR)  
BEND 236 (POOR)  
PRINEVILLE 318 (FAIR)  
ENTERPRISE 342 (FAIR)  
HERMISTON 497 (FAIR)  
JOHN DAY 430 (FAIR)  
LA GRANDE 351 (FAIR)  
MADRAS 278 (POOR)  
MEACHAM 346 (FAIR)  
PENDLETON 463 (FAIR)  
REDMOND 300 (POOR)  
SENECA 455 (FAIR)  
THE DALLES 590 (FAIR)  
 
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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