676  
AUUS46 KPDT 181224  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
524 AM PDT FRI SEP 18 2020  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 3-9 MPH. SW 6-10 MPH.  
TRANSPORT WINDS S 4-9 MPH. SW 8-12 MPH.  
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR SAT SEP 19 GOOD.  
 
VENTILATION INDEX (CATEGORY) 29 (POOR). 245 (POOR).  
OUTLOOK FOR SAT SEP 19 1043 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 3-6 MPH. SW 6-10 MPH.  
TRANSPORT WINDS NW 3-7 MPH. SW 8-13 MPH.  
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SAT SEP 19 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 342 (FAIR).  
OUTLOOK FOR SAT SEP 19 721 (GOOD).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 2-5 MPH. S 8-12 MPH.  
TRANSPORT WINDS SW 4-5 MPH. S 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SAT SEP 19 GOOD.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 805 (GOOD).  
OUTLOOK FOR SAT SEP 19 679 (GOOD).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 342 (FAIR)  
ELLENSBURG 321 (FAIR)  
GOLDENDALE 591 (FAIR)  
TRI-CITIES 231 (POOR)  
WALLA WALLA 208 (POOR)  
YAKIMA 295 (POOR)  
BEND 606 (GOOD)  
PRINEVILLE 543 (FAIR)  
ENTERPRISE 1040 (GOOD)  
HERMISTON 267 (POOR)  
JOHN DAY 1050 (GOOD)  
LA GRANDE 699 (GOOD)  
MADRAS 520 (FAIR)  
MEACHAM 371 (FAIR)  
PENDLETON 206 (POOR)  
REDMOND 582 (FAIR)  
SENECA 1050 (GOOD)  
THE DALLES 632 (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/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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