202  
AUUS46 KPDT 231139  
DDOPDT  
 
DAILY DISPERSION OUTLOOK  
NATIONAL WEATHER SERVICE PENDLETON OR  
440 AM PDT THU MAR 23 2017  
 
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***  
 
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO  
 
7:00 AM AFTERNOON  
SURFACE WINDS SW 4-9 MPH. SW 4-9 MPH.  
TRANSPORT WINDS SW 10-14 MPH. SW 7-10 MPH.  
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.  
DISPERSION CATEGORY FAIR. FAIR.  
OUTLOOK FOR FRI MAR 24 GOOD.  
 
VENTILATION INDEX (CATEGORY) 118 (POOR). 455 (FAIR).  
OUTLOOK FOR FRI MAR 24 557 (FAIR).  
 
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...  
SELAH...AND NACHES AREA  
 
7:00 AM AFTERNOON  
SURFACE WINDS VRB 0-3 MPH. S 4-9 MPH.  
TRANSPORT WINDS W 5-9 MPH. SW 5-9 MPH.  
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.  
DISPERSION CATEGORY POOR. FAIR.  
OUTLOOK FOR FRI MAR 24 FAIR.  
 
VENTILATION INDEX (CATEGORY) 58 (POOR). 318 (FAIR).  
OUTLOOK FOR FRI MAR 24 428 (FAIR).  
 
FOR THE GRANDE RONDE RIVER VALLEY  
 
7:00 AM AFTERNOON  
SURFACE WINDS NW 0-5 MPH. SW 0-4 MPH.  
TRANSPORT WINDS W 3-6 MPH. SW 3-5 MPH.  
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.  
DISPERSION CATEGORY POOR. POOR.  
OUTLOOK FOR FRI MAR 24 GOOD.  
 
VENTILATION INDEX (CATEGORY) 108 (POOR). 165 (POOR).  
OUTLOOK FOR FRI MAR 24 569 (FAIR).  
 
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES  
CLE ELUM 106 (POOR)  
ELLENSBURG 130 (POOR)  
GOLDENDALE 325 (FAIR)  
TRI-CITIES 358 (FAIR)  
WALLA WALLA 494 (FAIR)  
YAKIMA 199 (POOR)  
BEND 604 (GOOD)  
PRINEVILLE 591 (FAIR)  
ENTERPRISE 159 (POOR)  
HERMISTON 452 (FAIR)  
JOHN DAY 330 (FAIR)  
LA GRANDE 187 (POOR)  
MADRAS 565 (FAIR)  
MEACHAM 313 (FAIR)  
PENDLETON 339 (FAIR)  
REDMOND 566 (FAIR)  
SENECA 348 (FAIR)  
THE DALLES 102 (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/FWXGRAPHICALVENTILATION.PHP?WFO=PDT  
 
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE  
NATIONAL WEATHER SERVICE IN PENDLETON.  

 
 
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