687
AUUS46 KPDT 171225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI OCT 17 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 9-17 MPH. W 18-25 MPH.
TRANSPORT WINDS SW 9-17 MPH. W 19-27 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SAT OCT 18 POOR.
OUTLOOK FOR SUN OCT 19 GOOD.
VENTILATION INDEX (CATEGORY) 91 (POOR). 728 (GOOD).
OUTLOOK FOR SAT OCT 18 71 (POOR).
OUTLOOK FOR SUN OCT 19 1050 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 4-8 MPH. W 12-16 MPH.
TRANSPORT WINDS W 4-8 MPH. NW 13-18 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT OCT 18 POOR.
OUTLOOK FOR SUN OCT 19 GOOD.
VENTILATION INDEX (CATEGORY) 44 (POOR). 495 (FAIR).
OUTLOOK FOR SAT OCT 18 90 (POOR).
OUTLOOK FOR SUN OCT 19 1035 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 5-7 MPH. W 14-16 MPH.
TRANSPORT WINDS S 5-9 MPH. W 18-25 MPH.
MIXING HEIGHT 4000 FT MSL. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT OCT 18 GOOD.
OUTLOOK FOR SUN OCT 19 GOOD.
VENTILATION INDEX (CATEGORY) 83 (POOR). 702 (GOOD).
OUTLOOK FOR SAT OCT 18 349 (FAIR).
OUTLOOK FOR SUN OCT 19 1049 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 8-18 MPH. W 18-24 MPH.
TRANSPORT WINDS SW 11-19 MPH. W 23-26 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SAT OCT 18 POOR.
OUTLOOK FOR SUN OCT 19 GOOD.
VENTILATION INDEX (CATEGORY) 136 (POOR). 819 (GOOD).
OUTLOOK FOR SAT OCT 18 113 (POOR).
OUTLOOK FOR SUN OCT 19 1049 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 1014 (GOOD)
ELLENSBURG 887 (GOOD)
GOLDENDALE 741 (GOOD)
TRI-CITIES 644 (GOOD)
WALLA WALLA 766 (GOOD)
YAKIMA 479 (FAIR)
BEND 309 (FAIR)
PRINEVILLE 485 (FAIR)
ENTERPRISE 846 (GOOD)
HERMISTON 715 (GOOD)
JOHN DAY 680 (GOOD)
LA GRANDE 833 (GOOD)
MADRAS 368 (FAIR)
MEACHAM 647 (GOOD)
PENDLETON 997 (GOOD)
REDMOND 506 (FAIR)
SENECA 654 (GOOD)
THE DALLES 910 (GOOD)
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:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
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