526
AUUS46 KPDT 261225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN APR 26 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 2-5 MPH. NW 5-9 MPH.
TRANSPORT WINDS S 3-6 MPH. NW 7-9 MPH.
MIXING HEIGHT NEAR SURFACE. 10500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON APR 27 FAIR.
OUTLOOK FOR TUE APR 28 FAIR.
VENTILATION INDEX (CATEGORY) 37 (POOR). 566 (FAIR).
OUTLOOK FOR MON APR 27 635 (GOOD).
OUTLOOK FOR TUE APR 28 603 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 3-6 MPH. NW 3-6 MPH.
TRANSPORT WINDS NW 6-9 MPH. NW 7-9 MPH.
MIXING HEIGHT NEAR SURFACE. 10500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON APR 27 POOR.
OUTLOOK FOR TUE APR 28 POOR.
VENTILATION INDEX (CATEGORY) 77 (POOR). 553 (FAIR).
OUTLOOK FOR MON APR 27 384 (FAIR).
OUTLOOK FOR TUE APR 28 231 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 1-3 MPH. NW 10-17 MPH.
TRANSPORT WINDS NW 3-6 MPH. NW 12-16 MPH.
MIXING HEIGHT 4000 FT MSL. 11500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON APR 27 GOOD.
OUTLOOK FOR TUE APR 28 GOOD.
VENTILATION INDEX (CATEGORY) 154 (POOR). 947 (GOOD).
OUTLOOK FOR MON APR 27 538 (FAIR).
OUTLOOK FOR TUE APR 28 431 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-5 MPH. NW 7-10 MPH.
TRANSPORT WINDS S 5-6 MPH. NW 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON APR 27 GOOD.
OUTLOOK FOR TUE APR 28 FAIR.
VENTILATION INDEX (CATEGORY) 56 (POOR). 631 (GOOD).
OUTLOOK FOR MON APR 27 655 (GOOD).
OUTLOOK FOR TUE APR 28 514 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 1042 (GOOD)
ELLENSBURG 815 (GOOD)
GOLDENDALE 585 (FAIR)
TRI-CITIES 635 (GOOD)
WALLA WALLA 441 (FAIR)
YAKIMA 640 (GOOD)
BEND 810 (GOOD)
PRINEVILLE 794 (GOOD)
ENTERPRISE 547 (FAIR)
HERMISTON 438 (FAIR)
JOHN DAY 1026 (GOOD)
LA GRANDE 920 (GOOD)
MADRAS 596 (FAIR)
MEACHAM 754 (GOOD)
PENDLETON 665 (GOOD)
REDMOND 802 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 626 (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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