938
AUUS46 KPDT 261225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN JUL 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 SW 4-12 MPH. W 7-12 MPH.
TRANSPORT WINDS SW 7-12 MPH. W 10-13 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON JUL 27 FAIR.
OUTLOOK FOR TUE JUL 28 GOOD.
VENTILATION INDEX (CATEGORY) 119 (POOR). 408 (FAIR).
OUTLOOK FOR MON JUL 27 487 (FAIR).
OUTLOOK FOR TUE JUL 28 637 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-5 MPH. SW 7-16 MPH.
TRANSPORT WINDS W 3-6 MPH. SW 10-17 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON JUL 27 FAIR.
OUTLOOK FOR TUE JUL 28 FAIR.
VENTILATION INDEX (CATEGORY) 55 (POOR). 578 (FAIR).
OUTLOOK FOR MON JUL 27 550 (FAIR).
OUTLOOK FOR TUE JUL 28 505 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS N 1-3 MPH. NW 5-7 MPH.
TRANSPORT WINDS NW 5-6 MPH. SW 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON JUL 27 GOOD.
OUTLOOK FOR TUE JUL 28 FAIR.
VENTILATION INDEX (CATEGORY) 38 (POOR). 351 (FAIR).
OUTLOOK FOR MON JUL 27 436 (FAIR).
OUTLOOK FOR TUE JUL 28 317 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-10 MPH. NW 6-10 MPH.
TRANSPORT WINDS S 6-13 MPH. W 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON JUL 27 FAIR.
OUTLOOK FOR TUE JUL 28 FAIR.
VENTILATION INDEX (CATEGORY) 84 (POOR). 324 (FAIR).
OUTLOOK FOR MON JUL 27 421 (FAIR).
OUTLOOK FOR TUE JUL 28 475 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 528 (FAIR)
ELLENSBURG 453 (FAIR)
GOLDENDALE 604 (GOOD)
TRI-CITIES 513 (FAIR)
WALLA WALLA 294 (POOR)
YAKIMA 525 (FAIR)
BEND 1050 (GOOD)
PRINEVILLE 724 (GOOD)
ENTERPRISE 483 (FAIR)
HERMISTON 404 (FAIR)
JOHN DAY 914 (GOOD)
LA GRANDE 386 (FAIR)
MADRAS 588 (FAIR)
MEACHAM 295 (POOR)
PENDLETON 354 (FAIR)
REDMOND 665 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 546 (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