567  
AUUS46 KPDT 181415  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
715 AM PDT WED SEP 18 2019  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 6-12 MPH. W 3-6 MPH.  
TRANSPORT WINDS S 5-10 MPH. SW 8-10 MPH.  
MIXING HEIGHT 4000 FT MSL. 8000 FT MSL.  
DISPERSION CATEGORY FAIR. FAIR.  
OUTLOOK FOR THU SEP 19 FAIR.  
 
VENTILATION INDEX (CATEGORY) 200 (POOR). 499 (FAIR).  
OUTLOOK FOR THU SEP 19 485 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 4-8 MPH. SW 1-4 MPH.  
TRANSPORT WINDS W 3-7 MPH. SW 4-7 MPH.  
MIXING HEIGHT 3500 FT MSL. 7500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR THU SEP 19 FAIR.  
 
VENTILATION INDEX (CATEGORY) 129 (POOR). 329 (FAIR).  
OUTLOOK FOR THU SEP 19 439 (FAIR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS S 13-22 MPH. S 5-7 MPH.  
TRANSPORT WINDS SE 8-11 MPH. S 8-10 MPH.  
MIXING HEIGHT 4500 FT MSL. 6500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR THU SEP 19 FAIR.  
 
VENTILATION INDEX (CATEGORY) 154 (POOR). 319 (FAIR).  
OUTLOOK FOR THU SEP 19 510 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 211 (POOR)  
ELLENSBURG 208 (POOR)  
GOLDENDALE 371 (FAIR)  
TRI-CITIES 510 (FAIR)  
WALLA WALLA 420 (FAIR)  
YAKIMA 220 (POOR)  
BEND 629 (GOOD)  
PRINEVILLE 561 (FAIR)  
ENTERPRISE 88 (POOR)  
HERMISTON 524 (FAIR)  
JOHN DAY 465 (FAIR)  
LA GRANDE 260 (POOR)  
MADRAS 512 (FAIR)  
MEACHAM 135 (POOR)  
PENDLETON 331 (FAIR)  
REDMOND 403 (FAIR)  
SENECA 482 (FAIR)  
THE DALLES 200 (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/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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