054  
AUUS46 KPDT 231226  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
526 AM PDT SAT MAR 23 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 5-10 MPH. NW 3-7 MPH.  
TRANSPORT WINDS SW 9-13 MPH. SW 9-13 MPH.  
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SUN MAR 24 FAIR.  
 
VENTILATION INDEX (CATEGORY) 53 (POOR). 339 (FAIR).  
OUTLOOK FOR SUN MAR 24 412 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS W 2-6 MPH. NW 1-5 MPH.  
TRANSPORT WINDS W 4-8 MPH. W 4-8 MPH.  
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR SUN MAR 24 POOR.  
 
VENTILATION INDEX (CATEGORY) 34 (POOR). 228 (POOR).  
OUTLOOK FOR SUN MAR 24 174 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 1-5 MPH. N 5-10 MPH.  
TRANSPORT WINDS NW 3-6 MPH. NW 5-10 MPH.  
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR SUN MAR 24 FAIR.  
 
VENTILATION INDEX (CATEGORY) 29 (POOR). 146 (POOR).  
OUTLOOK FOR SUN MAR 24 192 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 287 (POOR)  
ELLENSBURG 389 (FAIR)  
GOLDENDALE 273 (POOR)  
TRI-CITIES 303 (FAIR)  
WALLA WALLA 209 (POOR)  
YAKIMA 278 (POOR)  
BEND 180 (POOR)  
PRINEVILLE 284 (POOR)  
ENTERPRISE 75 (POOR)  
HERMISTON 391 (FAIR)  
JOHN DAY 150 (POOR)  
LA GRANDE 165 (POOR)  
MADRAS 219 (POOR)  
MEACHAM 146 (POOR)  
PENDLETON 296 (POOR)  
REDMOND 278 (POOR)  
SENECA 208 (POOR)  
THE DALLES 289 (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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