377  
AUUS46 KPDT 201051  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
351 AM PDT SUN MAY 20 2018  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 3-6 MPH. W 7-9 MPH.  
TRANSPORT WINDS SW 5-9 MPH. SW 6-11 MPH.  
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR MON MAY 21 POOR.  
 
VENTILATION INDEX (CATEGORY) 68 (POOR). 160 (POOR).  
OUTLOOK FOR MON MAY 21 135 (POOR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 4-5 MPH. S 4-6 MPH.  
TRANSPORT WINDS NW 6-8 MPH. W 6-10 MPH.  
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR MON MAY 21 POOR.  
 
VENTILATION INDEX (CATEGORY) 77 (POOR). 88 (POOR).  
OUTLOOK FOR MON MAY 21 106 (POOR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NE 4-6 MPH. NW 6-9 MPH.  
TRANSPORT WINDS S 5-7 MPH. NW 7-11 MPH.  
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR MON MAY 21 FAIR.  
 
VENTILATION INDEX (CATEGORY) 25 (POOR). 109 (POOR).  
OUTLOOK FOR MON MAY 21 184 (POOR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 255 (POOR)  
ELLENSBURG 200 (POOR)  
GOLDENDALE 212 (POOR)  
TRI-CITIES 134 (POOR)  
WALLA WALLA 134 (POOR)  
YAKIMA 70 (POOR)  
BEND 272 (POOR)  
PRINEVILLE 222 (POOR)  
ENTERPRISE 490 (FAIR)  
HERMISTON 189 (POOR)  
JOHN DAY 102 (POOR)  
LA GRANDE 121 (POOR)  
MADRAS 233 (POOR)  
MEACHAM 72 (POOR)  
PENDLETON 132 (POOR)  
REDMOND 248 (POOR)  
SENECA 39 (POOR)  
THE DALLES 490 (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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