370  
AUUS46 KPDT 061041  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
341 AM PDT MON APR 6 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 2-5 MPH. W 8-10 MPH.  
TRANSPORT WINDS S-SW 1-4 MPH. W 7-10 MPH.  
MIXING HEIGHT 3500 FT MSL. 7500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE APR 7 FAIR.  
 
VENTILATION INDEX (CATEGORY) 79 (POOR). 350 (FAIR).  
OUTLOOK FOR TUE APR 7 532 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 4-8 MPH. W 4-8 MPH.  
TRANSPORT WINDS NW 4-8 MPH. W 6-8 MPH.  
MIXING HEIGHT 3500 FT MSL. 8000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE APR 7 FAIR.  
 
VENTILATION INDEX (CATEGORY) 147 (POOR). 369 (FAIR).  
OUTLOOK FOR TUE APR 7 226 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS VRB 1-4 MPH. NW 9-11 MPH.  
TRANSPORT WINDS SW 1-5 MPH. NW 8-11 MPH.  
MIXING HEIGHT 4500 FT MSL. 7500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE APR 7 FAIR.  
 
VENTILATION INDEX (CATEGORY) 50 (POOR). 312 (FAIR).  
OUTLOOK FOR TUE APR 7 378 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 495 (FAIR)  
ELLENSBURG 634 (GOOD)  
GOLDENDALE 547 (FAIR)  
TRI-CITIES 412 (FAIR)  
WALLA WALLA 294 (POOR)  
YAKIMA 363 (FAIR)  
BEND 374 (FAIR)  
PRINEVILLE 430 (FAIR)  
ENTERPRISE 201 (POOR)  
HERMISTON 358 (FAIR)  
JOHN DAY 322 (FAIR)  
LA GRANDE 324 (FAIR)  
MADRAS 361 (FAIR)  
MEACHAM 249 (POOR)  
PENDLETON 331 (FAIR)  
REDMOND 389 (FAIR)  
SENECA 407 (FAIR)  
THE DALLES 688 (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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