609
AUUS46 KPDT 271225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU AUG 27 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS S 6-15 MPH. W 14-20 MPH.
TRANSPORT WINDS SW 8-15 MPH. W 15-21 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI AUG 28 FAIR.
OUTLOOK FOR SAT AUG 29 GOOD.
VENTILATION INDEX (CATEGORY) 116 (POOR). 637 (GOOD).
OUTLOOK FOR FRI AUG 28 401 (FAIR).
OUTLOOK FOR SAT AUG 29 800 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-8 MPH. W 13-17 MPH.
TRANSPORT WINDS W 4-8 MPH. W 15-21 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI AUG 28 FAIR.
OUTLOOK FOR SAT AUG 29 GOOD.
VENTILATION INDEX (CATEGORY) 77 (POOR). 840 (GOOD).
OUTLOOK FOR FRI AUG 28 310 (FAIR).
OUTLOOK FOR SAT AUG 29 711 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 1-5 MPH. NW 6-8 MPH.
TRANSPORT WINDS NW 4-8 MPH. W 9-11 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI AUG 28 GOOD.
OUTLOOK FOR SAT AUG 29 GOOD.
VENTILATION INDEX (CATEGORY) 42 (POOR). 355 (FAIR).
OUTLOOK FOR FRI AUG 28 355 (FAIR).
OUTLOOK FOR SAT AUG 29 601 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 4-12 MPH. W 10-15 MPH.
TRANSPORT WINDS SW 9-13 MPH. W 12-17 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI AUG 28 FAIR.
OUTLOOK FOR SAT AUG 29 GOOD.
VENTILATION INDEX (CATEGORY) 104 (POOR). 433 (FAIR).
OUTLOOK FOR FRI AUG 28 386 (FAIR).
OUTLOOK FOR SAT AUG 29 811 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 610 (GOOD)
ELLENSBURG 920 (GOOD)
GOLDENDALE 822 (GOOD)
TRI-CITIES 769 (GOOD)
WALLA WALLA 535 (FAIR)
YAKIMA 665 (GOOD)
BEND 792 (GOOD)
PRINEVILLE 603 (GOOD)
ENTERPRISE 543 (FAIR)
HERMISTON 698 (GOOD)
JOHN DAY 905 (GOOD)
LA GRANDE 379 (FAIR)
MADRAS 577 (FAIR)
MEACHAM 260 (POOR)
PENDLETON 507 (FAIR)
REDMOND 610 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 801 (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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