983
AUUS46 KPDT 251225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI SEP 25 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. SW 27-32 MPH.
TRANSPORT WINDS SW 8-16 MPH. SW 36-40 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SAT SEP 26 POOR.
OUTLOOK FOR SUN SEP 27 FAIR.
VENTILATION INDEX (CATEGORY) 123 (POOR). 1050 (GOOD).
OUTLOOK FOR SAT SEP 26 189 (POOR).
OUTLOOK FOR SUN SEP 27 164 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS S 6-16 MPH. SW 22-29 MPH.
TRANSPORT WINDS SW 7-16 MPH. W 28-37 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT SEP 26 POOR.
OUTLOOK FOR SUN SEP 27 POOR.
VENTILATION INDEX (CATEGORY) 226 (POOR). 1046 (GOOD).
OUTLOOK FOR SAT SEP 26 170 (POOR).
OUTLOOK FOR SUN SEP 27 171 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS W 6-15 MPH. W 17-23 MPH.
TRANSPORT WINDS W 10-16 MPH. W 22-25 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT SEP 26 FAIR.
OUTLOOK FOR SUN SEP 27 FAIR.
VENTILATION INDEX (CATEGORY) 95 (POOR). 915 (GOOD).
OUTLOOK FOR SAT SEP 26 204 (POOR).
OUTLOOK FOR SUN SEP 27 147 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 6-12 MPH. SW 23-29 MPH.
TRANSPORT WINDS SW 8-14 MPH. SW 32-39 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT SEP 26 FAIR.
OUTLOOK FOR SUN SEP 27 FAIR.
VENTILATION INDEX (CATEGORY) 102 (POOR). 1050 (GOOD).
OUTLOOK FOR SAT SEP 26 224 (POOR).
OUTLOOK FOR SUN SEP 27 133 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 547 (FAIR)
ELLENSBURG 577 (FAIR)
GOLDENDALE 930 (GOOD)
TRI-CITIES 1050 (GOOD)
WALLA WALLA 1050 (GOOD)
YAKIMA 1008 (GOOD)
BEND 1048 (GOOD)
PRINEVILLE 1050 (GOOD)
ENTERPRISE 859 (GOOD)
HERMISTON 1050 (GOOD)
JOHN DAY 1050 (GOOD)
LA GRANDE 1046 (GOOD)
MADRAS 1050 (GOOD)
MEACHAM 1050 (GOOD)
PENDLETON 1050 (GOOD)
REDMOND 1050 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 989 (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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