043  
AUUS46 KPDT 190921  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
221 AM PDT SAT AUG 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 SW-NW 7-13 MPH. SW-W 7-13 MPH.  
TRANSPORT WINDS SW-NW 7-13 MPH. NW 7-13 MPH.  
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SUN AUG 20 POOR.  
 
VENTILATION INDEX (CATEGORY) 93 (POOR). 561 (FAIR).  
OUTLOOK FOR SUN AUG 20 308 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 3-7 MPH. NW 5-10 MPH.  
TRANSPORT WINDS NW 3-7 MPH. NW 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN AUG 20 POOR.  
 
VENTILATION INDEX (CATEGORY) 75 (POOR). 511 (FAIR).  
OUTLOOK FOR SUN AUG 20 285 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 2-6 MPH. NW 5-10 MPH.  
TRANSPORT WINDS W 2-6 MPH. NW 15-20 MPH.  
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN AUG 20 GOOD.  
 
VENTILATION INDEX (CATEGORY) 76 (POOR). 533 (FAIR).  
OUTLOOK FOR SUN AUG 20 392 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 447 (FAIR)  
ELLENSBURG 697 (GOOD)  
GOLDENDALE 101 (POOR)  
TRI-CITIES 478 (FAIR)  
WALLA WALLA 637 (GOOD)  
YAKIMA 654 (GOOD)  
BEND 501 (FAIR)  
PRINEVILLE 536 (FAIR)  
ENTERPRISE 554 (FAIR)  
HERMISTON 479 (FAIR)  
JOHN DAY 533 (FAIR)  
LA GRANDE 563 (FAIR)  
MADRAS 520 (FAIR)  
MEACHAM 492 (FAIR)  
PENDLETON 577 (FAIR)  
REDMOND 606 (GOOD)  
SENECA 485 (FAIR)  
THE DALLES 385 (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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