478  
AUUS46 KPDT 201010  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
310 AM PDT FRI SEP 20 2019  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE-SW 3-7 MPH. SW 10-15 MPH.  
TRANSPORT WINDS SE-SW 3-7 MPH. NW 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SAT SEP 21 FAIR.  
 
VENTILATION INDEX (CATEGORY) 55 (POOR). 387 (FAIR).  
OUTLOOK FOR SAT SEP 21 403 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 3-7 MPH. W 5-10 MPH.  
TRANSPORT WINDS NW 3-7 MPH. NW 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SAT SEP 21 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 390 (FAIR).  
OUTLOOK FOR SAT SEP 21 133 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 1-5 MPH. NW 5-10 MPH.  
TRANSPORT WINDS NW 1-5 MPH. NW 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SAT SEP 21 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 317 (FAIR).  
OUTLOOK FOR SAT SEP 21 179 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 301 (FAIR)  
ELLENSBURG 443 (FAIR)  
GOLDENDALE 312 (FAIR)  
TRI-CITIES 392 (FAIR)  
WALLA WALLA 399 (FAIR)  
YAKIMA 483 (FAIR)  
BEND 640 (GOOD)  
PRINEVILLE 501 (FAIR)  
ENTERPRISE 333 (FAIR)  
HERMISTON 393 (FAIR)  
JOHN DAY 256 (POOR)  
LA GRANDE 349 (FAIR)  
MADRAS 590 (FAIR)  
MEACHAM 267 (POOR)  
PENDLETON 397 (FAIR)  
REDMOND 656 (GOOD)  
SENECA 325 (FAIR)  
THE DALLES 600 (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/GFORECAST/GINDEX.PHP?FCST=MIXHGT,VENTCAT,TRANSWIND,VENTINDX&VT=0,72  
 
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE  
NATIONAL WEATHER SERVICE IN PENDLETON.  
 

 
 
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