493
AUUS46 KPDT 291325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST THU JAN 29 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 3-7 MPH. S 3-6 MPH.
TRANSPORT WINDS S 4-9 MPH. S 4-9 MPH.
MIXING HEIGHT NEAR SURFACE. NEAR SURFACE.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 30 POOR.
OUTLOOK FOR SAT JAN 31 POOR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 41 (POOR).
OUTLOOK FOR FRI JAN 30 29 (POOR).
OUTLOOK FOR SAT JAN 31 41 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS E 1-3 MPH. SE 2-5 MPH.
TRANSPORT WINDS SE 3-6 MPH. S 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 30 POOR.
OUTLOOK FOR SAT JAN 31 POOR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 45 (POOR).
OUTLOOK FOR FRI JAN 30 27 (POOR).
OUTLOOK FOR SAT JAN 31 40 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 6-10 MPH. S 8-11 MPH.
TRANSPORT WINDS S 11-15 MPH. S 11-14 MPH.
MIXING HEIGHT 4000 FT MSL. 4500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI JAN 30 GOOD.
OUTLOOK FOR SAT JAN 31 GOOD.
VENTILATION INDEX (CATEGORY) 121 (POOR). 205 (POOR).
OUTLOOK FOR FRI JAN 30 368 (FAIR).
OUTLOOK FOR SAT JAN 31 280 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-9 MPH. S 5-9 MPH.
TRANSPORT WINDS S 9-15 MPH. S 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY FAIR. POOR.
OUTLOOK FOR FRI JAN 30 POOR.
OUTLOOK FOR SAT JAN 31 POOR.
VENTILATION INDEX (CATEGORY) 63 (POOR). 102 (POOR).
OUTLOOK FOR FRI JAN 30 76 (POOR).
OUTLOOK FOR SAT JAN 31 74 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 90 (POOR)
ELLENSBURG 56 (POOR)
GOLDENDALE 25 (POOR)
TRI-CITIES 38 (POOR)
WALLA WALLA 64 (POOR)
YAKIMA 26 (POOR)
BEND 154 (POOR)
PRINEVILLE 130 (POOR)
ENTERPRISE 59 (POOR)
HERMISTON 25 (POOR)
JOHN DAY 193 (POOR)
LA GRANDE 172 (POOR)
MADRAS 163 (POOR)
MEACHAM 78 (POOR)
PENDLETON 69 (POOR)
REDMOND 115 (POOR)
SENECA 213 (POOR)
THE DALLES 27 (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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