792  
AUUS46 KPDT 230941  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
241 AM PDT MON APR 23 2018  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SE 3-7 MPH. N-NE 4-9 MPH.  
TRANSPORT WINDS SE 3-7 MPH. NE 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE APR 24 FAIR.  
 
VENTILATION INDEX (CATEGORY) 27 (POOR). 254 (POOR).  
OUTLOOK FOR TUE APR 24 324 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 3-7 MPH. NE 5-10 MPH.  
TRANSPORT WINDS NW 3-7 MPH. NE 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE APR 24 POOR.  
 
VENTILATION INDEX (CATEGORY) 43 (POOR). 356 (FAIR).  
OUTLOOK FOR TUE APR 24 160 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 6-12 MPH. N 6-12 MPH.  
TRANSPORT WINDS NE 6-12 MPH. NE 10-15 MPH.  
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR TUE APR 24 GOOD.  
 
VENTILATION INDEX (CATEGORY) 33 (POOR). 303 (FAIR).  
OUTLOOK FOR TUE APR 24 397 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 287 (POOR)  
ELLENSBURG 314 (FAIR)  
GOLDENDALE 450 (FAIR)  
TRI-CITIES 184 (POOR)  
WALLA WALLA 258 (POOR)  
YAKIMA 345 (FAIR)  
BEND 283 (POOR)  
PRINEVILLE 266 (POOR)  
ENTERPRISE 272 (POOR)  
HERMISTON 202 (POOR)  
JOHN DAY 184 (POOR)  
LA GRANDE 310 (FAIR)  
MADRAS 366 (FAIR)  
MEACHAM 232 (POOR)  
PENDLETON 266 (POOR)  
REDMOND 263 (POOR)  
SENECA 158 (POOR)  
THE DALLES 282 (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/FORECAST/INDEX.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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