421
AUUS46 KPDT 281325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST FRI NOV 28 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS NW 4-10 MPH. W 3-6 MPH.
TRANSPORT WINDS NW 7-13 MPH. W 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 29 POOR.
OUTLOOK FOR SUN NOV 30 POOR.
VENTILATION INDEX (CATEGORY) 48 (POOR). 108 (POOR).
OUTLOOK FOR SAT NOV 29 64 (POOR).
OUTLOOK FOR SUN NOV 30 83 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 3-8 MPH. N 2-5 MPH.
TRANSPORT WINDS N 6-11 MPH. NE 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 29 POOR.
OUTLOOK FOR SUN NOV 30 POOR.
VENTILATION INDEX (CATEGORY) 54 (POOR). 115 (POOR).
OUTLOOK FOR SAT NOV 29 75 (POOR).
OUTLOOK FOR SUN NOV 30 41 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 2-4 MPH. NW 5-9 MPH.
TRANSPORT WINDS SW 6-9 MPH. NW 11-15 MPH.
MIXING HEIGHT 4000 FT MSL. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT NOV 29 GOOD.
OUTLOOK FOR SUN NOV 30 FAIR.
VENTILATION INDEX (CATEGORY) 80 (POOR). 290 (POOR).
OUTLOOK FOR SAT NOV 29 254 (POOR).
OUTLOOK FOR SUN NOV 30 179 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS W 3-7 MPH. W 3-7 MPH.
TRANSPORT WINDS W 5-9 MPH. W 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 29 POOR.
OUTLOOK FOR SUN NOV 30 POOR.
VENTILATION INDEX (CATEGORY) 56 (POOR). 96 (POOR).
OUTLOOK FOR SAT NOV 29 44 (POOR).
OUTLOOK FOR SUN NOV 30 107 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 81 (POOR)
ELLENSBURG 46 (POOR)
GOLDENDALE 67 (POOR)
TRI-CITIES 126 (POOR)
WALLA WALLA 81 (POOR)
YAKIMA 70 (POOR)
BEND 153 (POOR)
PRINEVILLE 82 (POOR)
ENTERPRISE 369 (FAIR)
HERMISTON 101 (POOR)
JOHN DAY 312 (FAIR)
LA GRANDE 319 (FAIR)
MADRAS 100 (POOR)
MEACHAM 97 (POOR)
PENDLETON 110 (POOR)
REDMOND 119 (POOR)
SENECA 298 (POOR)
THE DALLES 67 (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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