950
AUUS46 KPDT 041225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN OCT 4 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 1-4 MPH. N 2-5 MPH.
TRANSPORT WINDS SW 3-6 MPH. NW 3-5 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR MON OCT 5 FAIR.
OUTLOOK FOR TUE OCT 6 POOR.
VENTILATION INDEX (CATEGORY) 25 (POOR). 74 (POOR).
OUTLOOK FOR MON OCT 5 256 (POOR).
OUTLOOK FOR TUE OCT 6 102 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-3 MPH. SE 1-5 MPH.
TRANSPORT WINDS NW 4-8 MPH. S 4-6 MPH.
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR MON OCT 5 POOR.
OUTLOOK FOR TUE OCT 6 POOR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 63 (POOR).
OUTLOOK FOR MON OCT 5 112 (POOR).
OUTLOOK FOR TUE OCT 6 55 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 2-9 MPH. S 6-11 MPH.
TRANSPORT WINDS S 5-9 MPH. S 10-13 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON OCT 5 FAIR.
OUTLOOK FOR TUE OCT 6 FAIR.
VENTILATION INDEX (CATEGORY) 33 (POOR). 342 (FAIR).
OUTLOOK FOR MON OCT 5 305 (FAIR).
OUTLOOK FOR TUE OCT 6 123 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-5 MPH. NW 2-4 MPH.
TRANSPORT WINDS S 4-7 MPH. NW 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR MON OCT 5 FAIR.
OUTLOOK FOR TUE OCT 6 POOR.
VENTILATION INDEX (CATEGORY) 26 (POOR). 76 (POOR).
OUTLOOK FOR MON OCT 5 338 (FAIR).
OUTLOOK FOR TUE OCT 6 127 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 80 (POOR)
ELLENSBURG 92 (POOR)
GOLDENDALE 78 (POOR)
TRI-CITIES 76 (POOR)
WALLA WALLA 62 (POOR)
YAKIMA 76 (POOR)
BEND 260 (POOR)
PRINEVILLE 144 (POOR)
ENTERPRISE 247 (POOR)
HERMISTON 66 (POOR)
JOHN DAY 387 (FAIR)
LA GRANDE 287 (POOR)
MADRAS 31 (POOR)
MEACHAM 72 (POOR)
PENDLETON 82 (POOR)
REDMOND 83 (POOR)
SENECA 570 (FAIR)
THE DALLES 81 (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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