446  
AUUS46 KPDT 191150  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
350 AM PST WED FEB 19 2020  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS E 2-5 MPH. NE 3-6 MPH.  
TRANSPORT WINDS E 3-7 MPH. E 5-9 MPH.  
MIXING HEIGHT 2500 FT MSL. 4500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR THU FEB 20 POOR.  
 
VENTILATION INDEX (CATEGORY) 71 (POOR). 193 (POOR).  
OUTLOOK FOR THU FEB 20 131 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 3-6 MPH. E 3-7 MPH.  
TRANSPORT WINDS N 3-6 MPH. E 7-10 MPH.  
MIXING HEIGHT 2500 FT MSL. 5000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR THU FEB 20 POOR.  
 
VENTILATION INDEX (CATEGORY) 90 (POOR). 283 (POOR).  
OUTLOOK FOR THU FEB 20 104 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS E 2-3 MPH. S 6-12 MPH.  
TRANSPORT WINDS SE 2-5 MPH. S 10-17 MPH.  
MIXING HEIGHT 4000 FT MSL. 5500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR THU FEB 20 FAIR.  
 
VENTILATION INDEX (CATEGORY) 50 (POOR). 275 (POOR).  
OUTLOOK FOR THU FEB 20 387 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 375 (FAIR)  
ELLENSBURG 293 (POOR)  
GOLDENDALE 476 (FAIR)  
TRI-CITIES 179 (POOR)  
WALLA WALLA 114 (POOR)  
YAKIMA 281 (POOR)  
BEND 483 (FAIR)  
PRINEVILLE 569 (FAIR)  
ENTERPRISE 69 (POOR)  
HERMISTON 248 (POOR)  
JOHN DAY 211 (POOR)  
LA GRANDE 300 (POOR)  
MADRAS 336 (FAIR)  
MEACHAM 236 (POOR)  
PENDLETON 199 (POOR)  
REDMOND 613 (GOOD)  
SENECA 250 (POOR)  
THE DALLES 526 (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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