300  
AUUS46 KPDT 221255  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
455 AM PST MON JAN 22 2018  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE-S 6-11 MPH. SW 13-17 MPH.  
TRANSPORT WINDS SE-S 6-11 MPH. W 22-24 MPH.  
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR TUE JAN 23 FAIR.  
 
VENTILATION INDEX (CATEGORY) 30 (POOR). 472 (FAIR).  
OUTLOOK FOR TUE JAN 23 99 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 4-9 MPH. W 8-14 MPH.  
TRANSPORT WINDS SW 4-9 MPH. W 13-18 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE JAN 23 POOR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 204 (POOR).  
OUTLOOK FOR TUE JAN 23 54 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 4-8 MPH. SW 6-8 MPH.  
TRANSPORT WINDS S 4-8 MPH. W 14-17 MPH.  
MIXING HEIGHT 4000 FT MSL. 8500 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR TUE JAN 23 FAIR.  
 
VENTILATION INDEX (CATEGORY) 42 (POOR). 476 (FAIR).  
OUTLOOK FOR TUE JAN 23 216 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 542 (FAIR)  
ELLENSBURG 329 (FAIR)  
GOLDENDALE 207 (POOR)  
TRI-CITIES 148 (POOR)  
WALLA WALLA 610 (GOOD)  
YAKIMA 101 (POOR)  
BEND 479 (FAIR)  
PRINEVILLE 538 (FAIR)  
ENTERPRISE 806 (GOOD)  
HERMISTON 282 (POOR)  
JOHN DAY 369 (FAIR)  
LA GRANDE 525 (FAIR)  
MADRAS 601 (GOOD)  
MEACHAM 671 (GOOD)  
PENDLETON 780 (GOOD)  
REDMOND 442 (FAIR)  
SENECA 443 (FAIR)  
THE DALLES 226 (POOR)  
 
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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