048
AUUS46 KPDT 241225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUL 24 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 3-10 MPH. W 5-9 MPH.
TRANSPORT WINDS SW 7-12 MPH. W 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT JUL 25 GOOD.
OUTLOOK FOR SUN JUL 26 FAIR.
VENTILATION INDEX (CATEGORY) 96 (POOR). 321 (FAIR).
OUTLOOK FOR SAT JUL 25 733 (GOOD).
OUTLOOK FOR SUN JUL 26 450 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-4 MPH. S 4-8 MPH.
TRANSPORT WINDS W 4-8 MPH. SW 8-13 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT JUL 25 GOOD.
OUTLOOK FOR SUN JUL 26 FAIR.
VENTILATION INDEX (CATEGORY) 39 (POOR). 401 (FAIR).
OUTLOOK FOR SAT JUL 25 1050 (GOOD).
OUTLOOK FOR SUN JUL 26 422 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS N 0-1 MPH. NW 5-6 MPH.
TRANSPORT WINDS NW 3-6 MPH. SW 10-11 MPH.
MIXING HEIGHT NEAR SURFACE. 10000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT JUL 25 GOOD.
OUTLOOK FOR SUN JUL 26 GOOD.
VENTILATION INDEX (CATEGORY) 31 (POOR). 422 (FAIR).
OUTLOOK FOR SAT JUL 25 781 (GOOD).
OUTLOOK FOR SUN JUL 26 347 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-8 MPH. NW 5-9 MPH.
TRANSPORT WINDS S 7-13 MPH. W 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT JUL 25 FAIR.
OUTLOOK FOR SUN JUL 26 FAIR.
VENTILATION INDEX (CATEGORY) 85 (POOR). 305 (FAIR).
OUTLOOK FOR SAT JUL 25 528 (FAIR).
OUTLOOK FOR SUN JUL 26 328 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 449 (FAIR)
ELLENSBURG 558 (FAIR)
GOLDENDALE 456 (FAIR)
TRI-CITIES 300 (POOR)
WALLA WALLA 280 (POOR)
YAKIMA 476 (FAIR)
BEND 1050 (GOOD)
PRINEVILLE 837 (GOOD)
ENTERPRISE 881 (GOOD)
HERMISTON 312 (FAIR)
JOHN DAY 1050 (GOOD)
LA GRANDE 438 (FAIR)
MADRAS 500 (FAIR)
MEACHAM 277 (POOR)
PENDLETON 308 (FAIR)
REDMOND 784 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 408 (FAIR)
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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page