916
AUUS46 KPDT 201325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST THU NOV 20 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 2-6 MPH. SW 3-6 MPH.
TRANSPORT WINDS SW 4-7 MPH. SW 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI NOV 21 POOR.
OUTLOOK FOR SAT NOV 22 POOR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 110 (POOR).
OUTLOOK FOR FRI NOV 21 66 (POOR).
OUTLOOK FOR SAT NOV 22 54 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-4 MPH. S 2-5 MPH.
TRANSPORT WINDS W 2-6 MPH. SW 2-5 MPH.
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI NOV 21 POOR.
OUTLOOK FOR SAT NOV 22 POOR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 62 (POOR).
OUTLOOK FOR FRI NOV 21 37 (POOR).
OUTLOOK FOR SAT NOV 22 36 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NE 1-3 MPH. NW 2-5 MPH.
TRANSPORT WINDS S 3-6 MPH. NW 6-11 MPH.
MIXING HEIGHT 4000 FT MSL. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI NOV 21 POOR.
OUTLOOK FOR SAT NOV 22 FAIR.
VENTILATION INDEX (CATEGORY) 38 (POOR). 168 (POOR).
OUTLOOK FOR FRI NOV 21 74 (POOR).
OUTLOOK FOR SAT NOV 22 260 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 1-5 MPH. SW 3-6 MPH.
TRANSPORT WINDS SW 5-9 MPH. SW 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI NOV 21 POOR.
OUTLOOK FOR SAT NOV 22 POOR.
VENTILATION INDEX (CATEGORY) 38 (POOR). 93 (POOR).
OUTLOOK FOR FRI NOV 21 80 (POOR).
OUTLOOK FOR SAT NOV 22 82 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 235 (POOR)
ELLENSBURG 164 (POOR)
GOLDENDALE 247 (POOR)
TRI-CITIES 116 (POOR)
WALLA WALLA 75 (POOR)
YAKIMA 48 (POOR)
BEND 95 (POOR)
PRINEVILLE 124 (POOR)
ENTERPRISE 91 (POOR)
HERMISTON 124 (POOR)
JOHN DAY 203 (POOR)
LA GRANDE 211 (POOR)
MADRAS 97 (POOR)
MEACHAM 90 (POOR)
PENDLETON 116 (POOR)
REDMOND 102 (POOR)
SENECA 191 (POOR)
THE DALLES 142 (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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