193  
AUUS46 KPDT 261130  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
430 AM PDT TUE MAY 26 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 8-12 MPH. W 10-12 MPH.  
TRANSPORT WINDS SW 8-12 MPH. SW 12-16 MPH.  
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.  
DISPERSION CATEGORY POOR. GOOD.  
OUTLOOK FOR WED MAY 27 POOR.  
 
VENTILATION INDEX (CATEGORY) 83 (POOR). 741 (GOOD).  
OUTLOOK FOR WED MAY 27 143 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 5-7 MPH. W 6-10 MPH.  
TRANSPORT WINDS W 2-4 MPH. W 5-7 MPH.  
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR WED MAY 27 POOR.  
 
VENTILATION INDEX (CATEGORY) 36 (POOR). 326 (FAIR).  
OUTLOOK FOR WED MAY 27 86 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 5-6 MPH. NW 7-8 MPH.  
TRANSPORT WINDS W 2-4 MPH. W 7-10 MPH.  
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR WED MAY 27 FAIR.  
 
VENTILATION INDEX (CATEGORY) 33 (POOR). 376 (FAIR).  
OUTLOOK FOR WED MAY 27 273 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 478 (FAIR)  
ELLENSBURG 613 (GOOD)  
GOLDENDALE 596 (FAIR)  
TRI-CITIES 545 (FAIR)  
WALLA WALLA 680 (GOOD)  
YAKIMA 253 (POOR)  
BEND 163 (POOR)  
PRINEVILLE 246 (POOR)  
ENTERPRISE 342 (FAIR)  
HERMISTON 828 (GOOD)  
JOHN DAY 247 (POOR)  
LA GRANDE 382 (FAIR)  
MADRAS 233 (POOR)  
MEACHAM 531 (FAIR)  
PENDLETON 702 (GOOD)  
REDMOND 220 (POOR)  
SENECA 300 (POOR)  
THE DALLES 663 (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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