135
AUUS46 KPDT 101225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU SEP 10 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 4-12 MPH. W 11-23 MPH.
TRANSPORT WINDS SW 7-13 MPH. W 14-24 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI SEP 11 FAIR.
OUTLOOK FOR SAT SEP 12 FAIR.
VENTILATION INDEX (CATEGORY) 83 (POOR). 656 (GOOD).
OUTLOOK FOR FRI SEP 11 311 (FAIR).
OUTLOOK FOR SAT SEP 12 208 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 0-6 MPH. W 7-14 MPH.
TRANSPORT WINDS NW 4-8 MPH. W 12-16 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI SEP 11 POOR.
OUTLOOK FOR SAT SEP 12 FAIR.
VENTILATION INDEX (CATEGORY) 34 (POOR). 461 (FAIR).
OUTLOOK FOR FRI SEP 11 183 (POOR).
OUTLOOK FOR SAT SEP 12 270 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 5-12 MPH. NW 7-13 MPH.
TRANSPORT WINDS S 8-15 MPH. W 16-19 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI SEP 11 FAIR.
OUTLOOK FOR SAT SEP 12 FAIR.
VENTILATION INDEX (CATEGORY) 59 (POOR). 764 (GOOD).
OUTLOOK FOR FRI SEP 11 316 (FAIR).
OUTLOOK FOR SAT SEP 12 146 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 6-12 MPH. W 14-20 MPH.
TRANSPORT WINDS S 9-15 MPH. W 18-20 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR FRI SEP 11 FAIR.
OUTLOOK FOR SAT SEP 12 FAIR.
VENTILATION INDEX (CATEGORY) 111 (POOR). 771 (GOOD).
OUTLOOK FOR FRI SEP 11 359 (FAIR).
OUTLOOK FOR SAT SEP 12 165 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 536 (FAIR)
ELLENSBURG 644 (GOOD)
GOLDENDALE 609 (GOOD)
TRI-CITIES 442 (FAIR)
WALLA WALLA 709 (GOOD)
YAKIMA 485 (FAIR)
BEND 571 (FAIR)
PRINEVILLE 617 (GOOD)
ENTERPRISE 850 (GOOD)
HERMISTON 688 (GOOD)
JOHN DAY 770 (GOOD)
LA GRANDE 853 (GOOD)
MADRAS 435 (FAIR)
MEACHAM 721 (GOOD)
PENDLETON 840 (GOOD)
REDMOND 637 (GOOD)
SENECA 907 (GOOD)
THE DALLES 652 (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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