497  
AUUS46 KPDT 271123  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
323 AM PST SAT FEB 27 2021  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 9-17 MPH. W 10-13 MPH.  
TRANSPORT WINDS W 11-18 MPH. NW 10-14 MPH.  
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.  
DISPERSION CATEGORY FAIR. FAIR.  
OUTLOOK FOR SUN FEB 28 GOOD.  
 
VENTILATION INDEX (CATEGORY) 76 (POOR). 668 (GOOD).  
OUTLOOK FOR SUN FEB 28 687 (GOOD).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 9-12 MPH. W 5-9 MPH.  
TRANSPORT WINDS NW 9-16 MPH. NW 11-17 MPH.  
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.  
DISPERSION CATEGORY FAIR. FAIR.  
OUTLOOK FOR SUN FEB 28 POOR.  
 
VENTILATION INDEX (CATEGORY) 48 (POOR). 613 (GOOD).  
OUTLOOK FOR SUN FEB 28 156 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 3-8 MPH. NW 8-12 MPH.  
TRANSPORT WINDS W 6-15 MPH. NW 15-21 MPH.  
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR SUN FEB 28 POOR.  
 
VENTILATION INDEX (CATEGORY) 77 (POOR). 664 (GOOD).  
OUTLOOK FOR SUN FEB 28 125 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 396 (FAIR)  
ELLENSBURG 439 (FAIR)  
GOLDENDALE 457 (FAIR)  
TRI-CITIES 777 (GOOD)  
WALLA WALLA 388 (FAIR)  
YAKIMA 547 (FAIR)  
BEND 570 (FAIR)  
PRINEVILLE 614 (GOOD)  
ENTERPRISE 852 (GOOD)  
HERMISTON 663 (GOOD)  
JOHN DAY 739 (GOOD)  
LA GRANDE 742 (GOOD)  
MADRAS 496 (FAIR)  
MEACHAM 672 (GOOD)  
PENDLETON 803 (GOOD)  
REDMOND 716 (GOOD)  
SENECA 880 (GOOD)  
THE DALLES 583 (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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