628
AUUS46 KPDT 211325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST FRI NOV 21 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SE 3-7 MPH. W 3-6 MPH.
TRANSPORT WINDS S 4-8 MPH. SW 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 22 POOR.
OUTLOOK FOR SUN NOV 23 FAIR.
VENTILATION INDEX (CATEGORY) 28 (POOR). 63 (POOR).
OUTLOOK FOR SAT NOV 22 31 (POOR).
OUTLOOK FOR SUN NOV 23 94 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-4 MPH. SE 2-4 MPH.
TRANSPORT WINDS W 2-5 MPH. S 2-4 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 22 POOR.
OUTLOOK FOR SUN NOV 23 FAIR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 35 (POOR).
OUTLOOK FOR SAT NOV 22 30 (POOR).
OUTLOOK FOR SUN NOV 23 116 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 1-3 MPH. SE 1-2 MPH.
TRANSPORT WINDS SW 1-3 MPH. SW 2-4 MPH.
MIXING HEIGHT 4000 FT MSL. 5000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 22 GOOD.
OUTLOOK FOR SUN NOV 23 GOOD.
VENTILATION INDEX (CATEGORY) 31 (POOR). 71 (POOR).
OUTLOOK FOR SAT NOV 22 379 (FAIR).
OUTLOOK FOR SUN NOV 23 383 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 3-6 MPH. W 2-5 MPH.
TRANSPORT WINDS S 4-7 MPH. SW 3-7 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT NOV 22 POOR.
OUTLOOK FOR SUN NOV 23 FAIR.
VENTILATION INDEX (CATEGORY) 33 (POOR). 76 (POOR).
OUTLOOK FOR SAT NOV 22 60 (POOR).
OUTLOOK FOR SUN NOV 23 114 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 182 (POOR)
ELLENSBURG 63 (POOR)
GOLDENDALE 55 (POOR)
TRI-CITIES 80 (POOR)
WALLA WALLA 79 (POOR)
YAKIMA 34 (POOR)
BEND 36 (POOR)
PRINEVILLE 64 (POOR)
ENTERPRISE 60 (POOR)
HERMISTON 34 (POOR)
JOHN DAY 70 (POOR)
LA GRANDE 76 (POOR)
MADRAS 63 (POOR)
MEACHAM 60 (POOR)
PENDLETON 52 (POOR)
REDMOND 63 (POOR)
SENECA 69 (POOR)
THE DALLES 33 (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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