642
AUUS46 KPDT 221325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST THU JAN 22 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS NW 1-3 MPH. N 2-5 MPH.
TRANSPORT WINDS N 2-4 MPH. N 2-5 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 23 POOR.
OUTLOOK FOR SAT JAN 24 POOR.
VENTILATION INDEX (CATEGORY) 26 (POOR). 58 (POOR).
OUTLOOK FOR FRI JAN 23 82 (POOR).
OUTLOOK FOR SAT JAN 24 44 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-3 MPH. NW 1-3 MPH.
TRANSPORT WINDS NW 2-4 MPH. E 1-3 MPH.
MIXING HEIGHT 2000 FT MSL. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 23 POOR.
OUTLOOK FOR SAT JAN 24 POOR.
VENTILATION INDEX (CATEGORY) 29 (POOR). 37 (POOR).
OUTLOOK FOR FRI JAN 23 132 (POOR).
OUTLOOK FOR SAT JAN 24 41 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 1-3 MPH. SE 1-3 MPH.
TRANSPORT WINDS S 5-7 MPH. S 5-9 MPH.
MIXING HEIGHT 4000 FT MSL. 4500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 23 FAIR.
OUTLOOK FOR SAT JAN 24 FAIR.
VENTILATION INDEX (CATEGORY) 63 (POOR). 118 (POOR).
OUTLOOK FOR FRI JAN 23 364 (FAIR).
OUTLOOK FOR SAT JAN 24 126 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS NE 0-2 MPH. NW 2-5 MPH.
TRANSPORT WINDS NE 1-3 MPH. NW 2-5 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 23 POOR.
OUTLOOK FOR SAT JAN 24 POOR.
VENTILATION INDEX (CATEGORY) 25 (POOR). 40 (POOR).
OUTLOOK FOR FRI JAN 23 93 (POOR).
OUTLOOK FOR SAT JAN 24 52 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 77 (POOR)
ELLENSBURG 46 (POOR)
GOLDENDALE 66 (POOR)
TRI-CITIES 49 (POOR)
WALLA WALLA 35 (POOR)
YAKIMA 36 (POOR)
BEND 25 (POOR)
PRINEVILLE 25 (POOR)
ENTERPRISE 48 (POOR)
HERMISTON 34 (POOR)
JOHN DAY 66 (POOR)
LA GRANDE 91 (POOR)
MADRAS 25 (POOR)
MEACHAM 25 (POOR)
PENDLETON 53 (POOR)
REDMOND 25 (POOR)
SENECA 91 (POOR)
THE DALLES 98 (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:
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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